7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
1/21
480V Metal-Enclosed SwitchgearSelection and Application Guide
SGSA-3061C (Nov.1998)
Contents
General .......................................................................................................1
Construction Details ................................................................................ 2-4
LV Power Circuit Breakers ...................................................................... 5-9
VT, CPT, CT Data ...................................................................................... 10
LV Power Circuit Breakers Ratings ..................................................... 11-13
Weights and Dimensions ................................................................... 14-15
Floor Plans / Side Views ..................................................................... 16-17
Guide Form Specifications .................................................................. 18-19
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
2/21
Siemens low-voltage metal-enclosedswitchgear is used in electric power dis-tribution systems for the control and pro-tection of circuits and equipment. Theswitchgear employs drawout type lowvoltage power circuit breakers described
on pages 5-13.LV switchgear is typically installed in:
Industrial Plants for power andlighting networks and feeders, powergeneration and other auxiliaries, and toprovide power for machine tools andmaterial handling equipment drivers.
Utility and Co-generation Facilities for motor control centers to protectand distribute power to electricaldevices such as blowers, compres-sors, fans, pumps, and motors.
Commercial and ResidentialBuildings for protection and distri-
bution of power for lighting, elevators,air conditioning, blowers, fans,motors, and pumps.
Available Types:
Type R indoor (NEMA 1)
Type SR outdoor walk-in (NEMA3R)
Low-voltage switchgear can be appliedon distribution systems with:
3-phase, 3- or 4-wire feeders
50 or 60Hz
Voltages of 208, 240,480, or 600 volts
Currents up to 5000 amperesCircuit breakers may be either manuallyor electrically operated, fused or unfused.The following designations are used:
RL Standard Interrupting
RLE Extended Interrupting
RLI High Interrupting
RLF Fused Type
Siemens Static Trip III trip units are pro-vided on all low voltage power circuitbreakers, except non-automatic circuitbreakers. All circuit breakers are ULListed. See Tables 4.10 and 4.11 for cir-cuit breaker ratings.
Industry Standards
Types R and SR switchgear with powercircuit breakers are designed, tested andconstructed in accordance with:
ANSI C37.20.1 Metal-EnclosedLow Voltage Power Circuit BreakerSwitchgear
ANSI C37.50 Test Procedure forLow Voltage AC Power Circuit
Breakers Used in Enclosures
ANSI C37.51 Conformance Testingof Metal-Enclosed Low Voltage ACPower Circuit Breaker SwitchgearAssemblies
Applicable standards of IEEE andNEMA
Applicable requirements of theNational Electric Code (NEC)
UL 1558 Metal-Enclosed LowVoltage Power Circuit BreakerSwitchgear
Type RL drawout circuit breakers are in
accordance with: ANSI C37.13 Low Voltage AC
Power Circuit Breakers Used inEnclosures
ANSI C37.16 Preferred Ratings,Related Requirements, andApplication for Low Voltage PowerCircuit Breakers and ACPower CircuitProtectors.
ANSI C37.17 Trip Devices for ACand General Purpose DC Low- VoltagePower Circuit Breakers.
UL 1066 Low Voltage AC and DCPower Circuit Breakers Used inEnclosures.
Features and modifications required byNEC are incorporated when the assemblyis designated as Service (Entrance)
Equipment.
UL Listing (Optional)
An Underwriters Laboratories listingmark (UL label) can be optionally suppliedfor each vertical section. The specificsection must contain only devices whichare UL Listed or are UL recognized com-ponents found suitable for the intendeduse. All circuit breaker drawout elementsare UL Listed.
General
1
480 Volt Metal-Enclosed Switchgear
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
3/21
480V Metal-Enclosed SwitchgearConstruction Details
2
General
General
The Siemens 480 volt switchgear assem-bly consists of one or more metal-enclosed, vertical sections. Normally theend sections are designed to allow forinstallation of future sections.
Each vertical section consists of up tofour individually enclosed breaker or auxil-iary compartments which are sized toprovide uniform height.
Included in each assembly are variouscomponents such as circuit breakers,instrumentation and control equipment,transformers, relays, three-phase buswork, and all internal wiring, connectors,and other supporting equipment.
In accordance with ANSI C37.20.1, themaximum temperature for parts that arehandled is 50C. The main bus maximumtemperature rise is 65C above 40Cambient. The temperature rise of the airsurrounding the cable connection pointsis limited to 45C above 40C ambient.
Finish
During construction, the structural steelparts, panels, and compartments are allprepared for painting by a five-stagewash system. Standard finish color islight gray ANSI 61. If a different finish
color is required, it is applied over thestandard finish with conventional sprayequipment and is allowed to air cure. Thecompleted finish has a nominal 2 mils dryfilm thickness.
Assembly Construction
Siemens metal-enclosed powerswitchgear is constructed of preformed,full-depth, 14-gauge steel sheets boltedtogether and reinforced with cross-mem-ber braces to form a rigid, self-supportingcompact assembly. The top and rearplates, and side sheets are all 14-gaugesteel. When two vertical sections aremounted together, two sheets of 14-gauge steel separate adjacent circuitbreaker compartments.
Bolted steel / glass polyester compart-ments housing each power circuit break-er are mounted in the vertical section toform the switchgear assembly. This iso-lates the circuit breakers from the bus /cable section and from adjacent circuitbreaker compartments.
The bus / cable section includes mainhorizontal bus, riser bus, connectionsfrom the main bus to each set of primarydisconnects, and load side copper run-back bus.
Grounded metal barriers can be providedto isolate the main bus from cable con-nections. Barriers are also available toisolate the incoming line to the main cir-cuit breakers from the main load bus ofthe switchgear.
Inter-Unit Wiring TroughMeter and Auxiliary Compartment Ventilation and Lifting StructureTelescoping Breaker Drawout Rails Ventilation Openings (RL-2000, RL-3200, RL-4000
and RL-5000)
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
4/21
480V Metal-Enclosed SwitchgearConstruction Details
General
3
Main and Ground Bus
The standard main bus is silver-platedcopper. Welded aluminum is also avail-able. Provisions for future extension ofaluminum main bus conductors includetin plated joints with high tensile strength
steel hardware. Tin-plated copper bus isoptionally available.
The main three-phase horizontal bus isarranged vertically one phase above theother with edge-to-edge alignment toprovide high, short circuit strength.Insulated main and vertical bus areoptional.
Main bus ratings available are 1600,2000, 3200, 4000, or 5000 amperes con-tinuous current. A neutral bus is fur-nished when specified, and can be rated1600, 2000, 3200, 4000 or 5000 amperescontinuous current.
A standard copper ground bus extendsthrough all sections. A cable lug can bemounted to the ground bus in eachsection.
Minimum bus bracing is 65,000 amperesRMS symmetrical. Higher symmetricalbracings are available based on the low-est breaker short circuit rating in thegroup.
Load side runbacks for feeder circuits areone-piece copper construction, are insu-lated with sleeve tubing in the main busarea, and are supported by high-strength,glass polyester moldings.
Control Wiring
Standard secondary and control wiring is#14 AWG extra-flexible, stranded coppertype SIS. Terminations are made withcompression-type, insulated terminals.
For devices not having screw-type termi-
nals, tab-type disconnects are used.
Insulation
The insulation used is Pyro-Shield, a fiber-glass-reinforced polyester material thathas high impact strength and low mois-ture absorption. Other features includehigh flame retardance, high resistance tochemical fumes, and long life at hightemperatures.
Circuit Breaker Compartments
Typical circuit breaker compartmentsinclude primary disconnects, ground dis-connect, drawout rails, and associatedinterlocks, and secondary disconnects, ifappropriate. Telescoping drawout rails
allow the breaker to be withdrawn fromthe compartment without additionalextensions or adapters. Compartmentsfor electrically-operated circuit breakersinclude secondary disconnects and con-trol circuit fuses. Up to three currenttransformers for metering or relaying canbe mounted in each compartment.
Circuit breaker compartment front panelscan be used to hold a variety of auxiliarydevices such as breaker control switch-es, ammeters, and test blocks.
Control Circuit Fuses Ground Disconnect
Secondary Disconnect Front Panel Devices Primary Disconnect
TOC Switch Operator Interference Interlock
MOC Switch Operator Space Heater Drawout Rails
Circuit Breaker Cell Interior
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
5/21
Options
Switchgear Mounted Hoist
The hoist, optional on type R indoorswitchgear, and standard on type SRoutdoor switchgear, travels along rails ontop of the switchgear to ease breaker
handling.
TOC and MOC Switches
The Truck Operated Cell (TOC) Switchprovides interlocking control or remoteindication of the breaker racking position.The cubicle mounted auxiliary switch orMechanism Operated Cell (MOC) switchprovides interlocking control or remoteindication based on the main contactposition (open or closed).
The switches have field adjustable con-tacts for simple conversion of contactsfrom normally open (a type) to normal-ly closed (b type). Each contact may be
adjusted individually without disassemblyor removal of wiring.
Shutters
These provide protection against acciden-tal contact with primary disconnects in a
compartment when the breaker isremoved.
Wire Trough Covers
Secondary wiring is enclosed within eachvertical section in the primary bus andoutgoing cable areas.
Key Interlock
This provides a mechanical means foroperating circuit breakers and otherdevices only when predescribed condi-tions are met.
PTS4 Test Set
Set allows testing of the full range of pro-tective settings of Static Trip III trip units.
Metering and Auxiliary Compartments
Compartments are available to housedevices such as voltage transformers,metering, control power transformers,and supervisory devices.
Instrument and Control Transformers
Voltage transformers and control powertransformers are mounted in auxiliarycompartments. These transformers areprotected by primary pull-out type cur-rent-limiting fuses and secondary fuses.Current transformers are normally mount-ed on the compartment primary discon-nect studs where they are readily acces-sible. See Tables 4.10, 4.11, 4.12, and4.13 for available ratings.
Outdoor Switchgear
Type SR outdoor switchgear, available upto 5000amp, is enclosed in a weatherresistant (NEMA 3R) steel housing. All
exterior doors extend below the floor lineand are gasket sealed.
For protection from snow, rain, and dust,the switchgear rests on a six-inch,formed steel base which provides rigidsupport and a tight bottom seal. A heavyduty, coal tar emulsion protective under-coating is applied to the underside forprotection against moisture and corro-sion. Shielded ventilation housings permitproper air circulation while excludingdust, dirt, and foreign matter.
A lighted, unobstructed service aisle isprovided at the front of the switchgearallowing inspection and maintenancewithout exposure to the elements, Anaccess door equipped with an emer-gency bar release is located at each endof the aisle. A GFI convenience outlet isincluded.
Accessories
Each switchgear assembly includes the
following standard accessories: Crank for circuit breaker racking
Lifting bar assembly for all circuitbreaker types
Spring charging handle for electricallyoperated circuit breakers
As an optional accessory, a test cabinetis available for indoor use that is wallmounted with necessary equipment fortesting electrically-operated breakers thathave been removed from the breakercompartments.
480V Metal-Enclosed SwitchgearConstruction Details
4
General
Typical Outdoor Installation with Liquid Filled Transformer
MOC and TOC Switches. TOC Shownwith Cover Removed.
Portable PTS4 Test Set
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
6/21
General
5
The Siemens RL series circuit breakersare designed for up to 600 volt servicewith current carrying capacities of up to5000 amperes and interrupting capacitiesof up to 130,000 amperes unfused or200,000 amperes fused.
These compact, fast operating circuitbreakers incorporate a stored energyclosing mechanism, either manually orelectrically charged, for fast, positiveclosing.
A quick-make closing mechanism releas-es the stored energy for high speed clos-ing of the primary contacts. This positive,controlled closing prevents unnecessaryarcing between the movable and station-ary breaker contacts and thus lengthenscontact and breaker life.
Manual tripping is performed with thepush lever on the front of the breaker. Upto three padlocks can be used to lock thebreaker contacts in the open position.
Typical Breaker Features
Arc Quenchers
Main and Arcing Contact Structures
Inductive Tripping Sensors
Control Wiring
Interlocks
Position Indicators
Interpole Barriers
Mechanical Trip Bar
Auxiliary Switches (option)
Each circuit breaker is a complete 3-pole,single-throw element that is mechanicallyand electrically trip-free, with a Static TripIII overcurrent trip unit.
Tables 4.16 and 4.17 show circuit breakeroperating and control data.
Circuit Breaker Racking
Racking is accomplished by turning aracking screw on the front of the breakerand may be done with the compartmentdoor open or closed. The racking screwturns U-shaped brackets on each side ofthe breaker which rack the breaker framein or out of the compartment.
As the racking screw is turned counter-clockwise, the breaker frame moves outof the compartment and disconnects theprimary contacts, followed by the sec-ondary contacts. With only the secondarycontacts connected (test position), thebreaker may be closed and opened fortesting without energizing the load. Anindicator located on the front of thebreaker identifies the position of thebreaker in the compartment.
Primary Disconnects
Primary current is applied to the circuitbreaker through silver plated disconnects.The stationary contacts are mountedthrough solid Pyro-Shield insulationsheets in the back of the compartments.The movable contacts are mounted onthe back of the breaker. Stainless steelsprings provide pressure to the fingercontacts in the connected position. Lowcontact resistance is maintained by theseself-aligning contacts. The primary con-tacts are positioned so that current canflow only in the connected position. Inthe test position the contacts are separat-ed a safe distance.
Secondary Disconnects
Secondary circuits are connected to thecircuit breaker through silver-plated, slide-type contacts which are located below
the arc quenching area to avoid contami-nation from arc product gases. The posi-tion of these contacts is visible with thepanel door open. The stationary contactsare silver-plated copper strips mountedon a Pyro-Shield molded base. The con-tacts are recessed to guide the movable,self-aligning contacts and to prevent acci-dental short circuiting. Secondary connec-tions are made automatically in both theconnected and test positions.
480V Metal-Enclosed SwitchgearLV Power Circuit Breakers
Type RL Circuit Breaker With Static Trip III Trip Unit And Optional Breaker Display Unit (BDU)
Secondary Disconnects in CellLeft =CommunicationsRight =Breaker Control
Main and Arcing Contacts SimilarDesign for all Ratings
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
7/21
480V Metal-Enclosed SwitchgearLV Power Circuit Breakers
6
General
Ground Connection
A ground contact is located on the circuitbreaker to connect with the ground cir-cuit. The breaker is grounded in both theconnected and test positions.
Drawout Interlocks
All circuit breakers have drawout inter-locks to:
prevent racking a closed breaker
prevent closing breaker until racked toconnected or test position
prevent inserting or withdrawingbreaker from compartment while clos-ing springs are charged
Arc Interruption
When a fault occurs, the main contactsopen first, transferring the fault current tothe arcing contacts. As the arcing con-tacts open, the thermal and electromag-netic characteristics force the arc into the
arc chute, where the metal plates length-en, constrict, and cool the arc.
Current Limiting Fuses
The 800,1600 and 2000 ampere circuitbreakers are available with integrallymounted current limiting fuses toincrease interrupting rating and / or tolimit short circuit (let-through) current.The fuses are bolted in series with theupper set of primary disconnects. Thebreakers meet all required standards andare UL Listed based on current limitingfuses.
An open fuse tripping device is wired in
parallel with the main fuses to insure thatthe circuit breaker opens if a main fuseinterrupts, thus preventing single phasing.This device holds the circuit breaker trip-free until it is reset and also indicateswhich main fuse has interrupted.
The higher ratedcircuit breakers, 3200,4000 and 5000 ampere, are availablewith current limiting fuses mounted on aseparate drawout carriage, which is keyinterlocked with the circuit breaker. Thisallows racking of the fuse carriage onlywiththe associated circuit breaker in the
open position. The carriage mounts in thesame vertical section as the circuit break-er element.
Current Sensors
The tripping system of the RL breaker isself-powered from the current sensorsmounted on the primary contacts of thebreaker element (four-wire ground applica-tions include a fourth sensor mounted inthe cable compartment). A signal from thecurrent sensors, proportional to primarycurrent, is applied to the trip device whichthen operates the actuator to trip thebreaker based on a pre-set time delayversus current magnitude relationship.
Ground shoe contact Mounting rails Racking position detent Stored energy mechanism position
indicator Contact position indicator Arc chutes Handle for manually charging stored
energy closing springs (optional onelectrically operated breakers)
Inter-phase barriers Racking mechanism shutter (with
packlocking provisions) Racking position indicator Contact closing release lever
(behind charging handle)
Clevis attached to racking drivescrew.
Circuit breaker rating nameplate Racking interlock bar Static Trip III trip unit test points Static Trip III overcurrent device Tripping lever (with padlocking
provisions) with guard. Breaker Display Unit (optional) Power switch for spring charging
motor (electrically operating break-er only)
Spring charging motor (electricallyoperated breaker only)Auxiliary switch (optional on man-ually operated breakers)
Integrally Fused RLF-800 Circuit Breaker
RL Circuit Breaker Features (Electrically Operated Breaker Shown)
Sensor RatingsFrame Size andMax Amp Rating
800 150, 200, 300,400, 600, 800
1600
2000
150, 200, 300, 400,600, 800, 1200, 1600
150, 200, 300, 400,600, 800, 1200, 1600, 2000
4000
3200 1200, 1600, 2000, 3200
1600, 2000,3200 , 4000
5000 5000
Table 4.1 Available Sensor Ratings
Optionally available with integral 2000A ground sensorwinding to meet NEC 239-95 requirements.
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
8/21
Static Trip III Trip UnitStatic overcurrent tripping devices havebeen standard on Siemens circuit break-ers for over thirty years. The Static Trip Illtrip unit features microprocessor-con-trolled tripping, while providing RMS
sensing for standard overcurrent protec-tion, and optional metering and communi-cations functions. Located in the lowerright side of the breaker, the trip unit isreadily accessible for simple reading andadjustment of all settings and indicators.Static Trip III trip units are interchange-able on all ratings of low voltage circuitbreakers.
The time / current characteristics of theStatic Trip III trip unit are shown on page13.
All communicating StaticTrip III trip units includea local communication
port that supports thebreaker-mounted displayunit or BDU. The BDUfeatures a high-visibility
alpha-numeric display. Real-time meteredvalues, min/max values, event log dataand setpoint data can be read on theBDU in straightforward engineering units.Alarm and relay setpoint can be config-ured using the BDU keypad.
This data can also be communicated toother devices or computers for controlmonitoring via Siemens ACCESS sys-tem. See Section 1 of this guide for athorough description of ACCESS.
General
7
480V Metal-Enclosed SwitchgearLV Power Circuit Breaker Trip Unit
Static Trip Ill Trip Unit (right) and Breaker Display Unit (left)
Harmonics distort the current wave shapeand can increase its peak value. Normal
peak-sensing units may trip, causing nui-sance shutdowns.
Siemens RMS sensing samples the entirecurrent wave shape and calculates theeffective heating value of the current.Static Trip Ill trip units provide accurateprotection and avoid unnecessary trips.
T: Long Time
S: Short Time
I: Instantaneous
G: Ground Fault
20, 30, 40, 50, 60 .10, .25, .40
Delay(Seconds @ 6X Setting)
Setting
DelayPickup
(X Sensor Rating)
3.5, 6, 1017, 30
.5, .55, .6, .65, .7, .75,
.8, .85, .9, .95, 1.0
(Seconds)
(Seconds)
(X LT Setting)
0.8, .15, .22
.30, .40
2, 3, 4, 5,
6, 7, 8, 12
DelayPickup(X Sensor Rating)
(Seconds)DelayPickup
(% Ground Sensor)
No IntentionalDelay
2, 4, 6, 8,12, 15
Table 4.2 Static Trip III Settings
Pickup is fixed at 1.1 times long time setting.
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
9/21
8
General
RL BreakerAccessories/Modifications
Type RL circuit breakers feature severaloptions, including:
Shunt Trip, (for MO breakers)
Operation Counter
Undervoltage Trip Device
Electrically Operated Interlock
Automatic Trip Alarm Contact (with orwithout Lockout Bell Alarm)
Tripping Actuator
The tripping actuator is a low energy,flux-shifting device that allows fast actiontripping of the breaker.
Shunt Trip
The shunt trip is used to electrically tripthe circuit breaker from a remote device,such as pushbutton, switch, or relay. Theshunt trip is standard on all electricallyoperated breakers, optional on manuallyoperated breakers. The shunt trip coil isdesigned for a momentary duty cycle.Thus, an a type auxiliary contact switchis used to interrupt the shunt trip circuitimmediately after the breaker is tripped.
When the coil is energized, the armaturepicks up and rotates the trip latch, there-by tripping the breaker. A compressionspring returns the armature to the normalposition.
480V Metal-Enclosed SwitchgearLV Power Circuit Breaker Trip Unit
Function
Model
III
Table 4.3 Static Trip III Trip Unit Functions
Self-Powered Overcurrent Protection
IIIC IIICP IIICPX
Requires additional compartment mounted devicesand wiring to meet specific application.
Supports optional Breaker Display Unit accessory.Open command uses alarm relay output and restricts
use for other alarm functions. Close commandrequires electrically operated breaker.
Included when ground fault protection specified.Requires N option and neutral current sensor.Only displayed for four wire systems.
RMS Sensing Switchable Thermal Memory
Ground Fault Protection opt opt opt opt
opt opt opt opt
LCD Target Protective Microprocessor Watchdog Pickup LEDs
Zone Interlocking (For Short Time and Ground Fault)
opt opt opt optRetrofit Universal Mounting Package
opt opt optAlarm Relay Output
RS-485 Communications Port
Breaker Display Unit Port Communications Microprocessor Watchdog Comm Watch LED Backup Shadow Protection
opt opt opt
opt opt opt
Communication Open/Close/Trip
Trip Log
Trip Unit Status Indication Breaker Position Indication
Breaker Operation Counter
Event Log Phase Current Metering Ground Current Metering Neutral Current Metering
Min/Max Current Log Power Metering Functions
Min/Max Power Log Extended Protective Relaying Extended Trip Log
Function
Model
Table 4.5Functions
Static Trip III Metering
Phase Currents
IIIC IIICP
Avg Phase Currents
Neutral Current opt opt
Phase Voltage Avg Phase Voltage Line Voltages
Avg Line Voltages
Ground Current
kW
Power Factor
kW Demand
kW Hours kW Hours Reverse kVA kVAR
kVAR Hours
Frequency
Protective FunctionSettingRange
Typical Applications
Motors
Table 4.4 Static Trip IIICPX Protective Relay Functions
Current Unbalance 550%
550%
60660V
60660V
102000kW
50.070.0 Hz
45.060.0 Hz
Generators Mains
Voltage Unbalance
Overvoltage Undervoltage
Reverse Power Overfrequency Underfrequency
Shunt Trip(Amperes)Seal-In/Inrush
OperatingVoltageRange
Nominal ControlVoltage
60 HzAC
104127120 1.65/7.7208254240 0.71/3.4
DC
2856 5.45
70140
48
125 2.76
140280250 1.85
Table 4.6 Shunt Trip Coil Ratings
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
10/21
480V Metal-Enclosed SwitchgearLV Power Circuit Breakers
General
9
RL Breaker Accessories /Modifications (contd)
Operation Counter
A mechanically-operated, 5-digit non-resetable counter can be mountedbeneath the breaker auxiliary switch.The counter is incremented by theaction of the auxiliary switch operatingmechanism.
Undervoltage Trip Device
The undervoltage trip device protectsagainst a drop in normal bus voltage andfunctions to directly trip the breaker.Pickup occurs at 85 percent or less ofrated value and dropout between 30 and60 percent of rated value. Pickup anddropout are individually adjustable.Instantaneous or time-delayed operationcan be provided. The static timing unit isadjustable from 0.04 to 4 seconds for
time delay. This allows the system todistinguish between undervoltageconditions and momentary voltage dips.
Electrically Operated InterlockThis can be added to interlock two break-ers, preventing both from being closed atthe same time. These electromechanicaldevices add an additional solenoid thatmust be energized before the breakercan be closed. When the interlock is de-energized, the breaker is held trip-freeand cannot be closed electrically ormanually. The interlock has a mechanicallink that goes to the main shaft of thebreaker. The interlock is held in thepicked-up position when the breaker isclosed. Once closed the interlock can bede-energized without tripping the breaker.
There are no adjustments for pickup ordropout voltages. The interlocks arecontinuously energized.
Automatic Trip Alarm Contact (with orwithout Lockout) (Bell Alarm)
The bell alarm contact is operated whenthe trip actuator operates in response tothe Static Trip III trip unit. It indicateswhen the circuit breaker has tripped as aresult of the static trip unit. The contactcan control a local or remote auxiliaryalarm for indication of an automatic tripor, by wiring in series with a breaker clos-ing coil, for interlocking to prevent circuitbreaker closure until the circuit is reset.The contact must be reset manually orelectrically (optional). The manually resetswitch is available with a single-poledouble-throw contact, or two single-polesingle-throw contacts. The electricallyreset switch is available with a single-pole single-throw contact.
If desired, a mechanical lockout optionmay be provided. This substitutes amanual reset for the automatically resettripping actuator. In this case the breakeris held trip free until the lockout ismanually reset.
480V Metal-Enclosed SwitchgearLV Power Circuit Breakers
DropoutVoltage
PickupVoltage
Nominal ControlVoltage
60 Hz AC
100120
240 or
480
60
DC 40 24
105
48
125 62
Table 4.7 Undervoltage TripRatings
Not available. Use 120 VAC undervoltage device withappropriate 240/120V or voltage transformer in cubicle.
BreakMakeContinuous
Bell Alarm Contact Ratings(Amperes)
NominalControlVoltage
60 HzAC
10.0 10.0
10.0
10.0
10.0
10.0
10.0
120
240
DC
0.5
0.5
48
125
0.25
10.0
10.0
0.5
0.5
0.25250
Table 4.9Ratings
Bell Alarm Contact
RL Circuit Breaker Rear View
Current Sensors PT Module (Optional)
Ground Shoe Contact Primary Disconnects
Secondary Disconnects
DropoutVoltage
PickupVoltage
Voltage Range
Nominal ControlVoltage
60 Hz AC104
208
120
240
36
72
DC
38 15
100
48
125 38
200250 75
Table 4.8 Interlock Coil Ratings
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
11/21
10
480V Metal-Enclosed SwitchgearVT, CPT, CT Data
Technical
Ratio
600:120 0.6
480:120 0.6
288:120 0.6
0.6
0.6
0.6
1.2
1.2
1.2
100
100
100
W X Y
Burden
Accuracy Class at 60 Hz
Volt-AmpRating
150
150
150
ThermalRatingVA
50/60
50/60
50/60
Hertz
Table 4.10 Voltage Transformers
Ratio
100:5 1.2
150:5 1.2
200:5 1.2
2.4
2.4
1.2
B-0.1 B-0.2 B-0.5
Accuracy at 60 Hz Metering Burden (ohms)
B-1.0
B-2.0
C5
C5
C10
250:5 0.6 1.2 C10
300:5 0.6 0.6 C10
400:5 0.6 0.6 C5
500:5 0.6 0.6 C10
600:5 0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.6 C10
800:5 C15
1000:5 C20
1200:5 C20
1500:5 C30
1600:5 C30
2000:5 C5
2500:5 0.3
0.3
0.3
0.3
0.3
0.3
0.3
1.2
1.2
0.6
0.6
0.3
0.3
0.3
0.3
0.3
0.3
0.6
1.2
0.3
0.3
0.3
0.3
0.6
0.6
0.3
0.6
0.6
0.6
1.2
1.2
0.6
C10
RelayClass
Table 4.12 Current Transformers for RL-800, RLE-800, RLI-800, RL-1600, RLE-1600, RL-2000, or RLE-2000 Applications
kVA Phase
Single
PrimaryVoltage
240/480
SecondaryVoltage
120/240
Table 4.11 Control Power Transformers115C Rise
35
1015
Requires complete compartment.
Breaker compartment will accept 3 CTs in-line on lower disconnects.
Ratio
1000:5
1200:5
1500:5
B-0.1 B-0.2 B-0.5
Accuracy at 60 Hz Metering Burden (ohms)
B-1.0 B-2.0
C20
C25
C35
2000:5 C25
2500:5 C30
3000:5 C15
3200:5 C20
4000:5
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
C10
5000:5 C10
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3 0.6
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.6
0.6
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3 0.6
1.2
1.2
RelayClass
Table 4.13 Current Transformers for RL-3200, RLE-3200, RL-4000, RLE-4000, or RL-5000Applications
Breaker compartment will accept 3 CTs in line on lower disconnects.Breaker compartment will accept 6 CTs, 3 on lower and 3 on upper disconnects.
Breaker compartment will accept 3 CTs in staggered arrangement, 2 on lower and 1 on upper disconnects.
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
12/21
480V Metal-Enclosed SwitchgearLV Power Circuit Breakers
11
480V Metal-Enclosed SwitchgearLV Power Circuit Breakers Ratings
Technical
FrameSizeAmperes
800
1600
2000
RL-800
600 635 2200
BreakerType
RatedVolts
Rated Max.Volts
Voltage Ratings
WithoutInstantaneousTrip Amperes
WithInstantaneousTrip Amperes
Short Circuit RatingSymmetrical CurrentShort Time
RatingSymmetricalAmperes
InsulationLevelDielectricWithstandVolts
30,00030,00030,000
ContinuousCurrentRatingAmperes
75800
RLE-800 42,00065,00042,000 75800
RLI-800 22,00042,00022,000 75800
RL-1600
RLE-1600
RL-2000
RLE-2000
3200RL-3200
RLE-3200
4000RL-4000
RLE-4000
RL-50005000
50,00065,00050,000 751600
65,00065,00065,000 751600
65,00065,00065,000 752000
85,00085,00085,000 752000
65,00085,00065,000 6003200
85,00085,00085,000 6003200
85,000100,00085,000 8004000
100,000100,000100,000 8004000
85,000100,00085,000 25005000
800
1600
2000
RL-800
480 508 2200
30,00030,00030,000 75800
RLE-800 42,00065,00042,000 75800
RLI-800 22,000100,00022,000 75800
RL-1600
RLE-1600
RL-2000
RLE-2000
3200RL-3200
RLE-3200
4000RL-4000
RLE-4000
RL-50005000
50,00065,00050,000 751600
65,00065,00065,000 751600
65,00065,00065,000 752000
85,000100,00085,000 752000
65,00085,00065,000 6003200
85,00085,00085,000 6003200
85,000100,00085,000 8004000
100,000100,000100,000 8004000
85,000100,00085,000 25005000
800
1600
2000
RL-800
240and208
254 2200
30,00042,00030,000 75800
RLE-800 42,00065,00042,000 75800
RLI-800 22,000100,00022,000 75800
RL-1600
RLE-1600
RL-2000
RLE-2000
3200RL-3200
RLE-3200
4000RL-4000
RLE-4000
RL-50005000
50,00065,00050,000 751600
65,00065,00065,000 751600
65,00065,00065,000 752000
85,000100,00085,000 752000
65,00085,00065,000 6003200
85,00085,00085,000 6003200
85,000130,00085,000 8004000
100,000130,000100,000 8004000
85,000100,00085,000 25005000
Table 4.14 Type RL Low-Voltage Power Circuit Breaker Ratings At 50 / 60 Hertz
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
13/21
12
Description
Time from EnergizingShunt Trip Coil Unit (Cycles):
Contacts Part Open
RL-800RLE-800
RLI-800RLF-800
RL-1600 & 2000
RLE-1600 & 2000RLF-1600 & 2000
RL-4000 & 5000
RLE-4000RLF-4000 & 5000
RL-3200
RLE-3200RLF-3200
Type
2.03.01.03.01.253.01.53.0
3.04.02.23.52.23.52.23.7Contacts Fully Open
Time from EnergizingClosing Control Relay Until (Cycles):
Contacts Touch 2.5 5.52.25.02.05.02.55.0
Minimum Voltage 22191715
2.5 5.72.55.72.35.32.85.3Contacts Fully Close
Length of Break,Inches (mm)
Between Main Contacts 1.00 (25 mm)1.00 (25 mm)1.00 (25 mm)1.00 (25 mm)
1.10 (28 mm)1.10 (28 mm)1.10 (28 mm)1.10 (28 mm)Between Arcing Contacts
Average SpringCharging Time (Seconds): Nominal Voltage 15131210
10888Maximum Voltage
Table 4.16 Type RL Circuit Breaker Operating Data (60 Hertz Basis)
480V Metal-Enclosed SwitchgearLV Power Circuit Breakers Ratings
Technical
FrameSizeAmperes
800
1600
2000
3200
RLF-800
208to600
600
TypeRatedVolts
Rated Max.Volts
Voltage Ratings
Rangeof FuseRating Amperes
Short CircuitRatingsSymmetrical Amps
InsulationLevel DielectricWithstand Volts
2501600
ContinuousCurrentRating Amperes
75800
RLF-1600
RLF-2000
8003000
20005000
200,0002200
2200
751600
4000 752000
6003200RLF-3200 &RFC-3200Fuse Carriage
200,000
400060002200 8004000200,000RLF-4000 &RFC-4000Fuse Carriage
4000
500060002200 25005000200,000RLF-5000 &RFC-5000Fuse Carriage
5000
Table 4.15 Type RLF Fused Circuit Breaker Ratings At 50/60 Hertz
Description
Nominal Control Voltage
Spring Charge Motor Voltage Range
Voltage Rating
120 VAC 240 VAC 48 VDC 125 VDC 250 VDC
Table 4.17 Type RL Circuit Breaker Control Data
104127 100140 200280208254 3856
Shunt Trip and Closing Coil Voltage Range (at Coil) 104127 70140 140280208254 2856
Tripping Coil Current (Seal-in / Inrush) Amperes 1.65/7.7 2.76 1.850.71/3.4 5.45
Closing Coil Current (Seal-in / Inrush) Amperes
Y-Relay Current (Max. Value Amperes)
1.65/7.7 2.76 1.850.71/3.4 5.45
Current of Spring Charge Motor: Cutoff Value Amperes
Inrush Value Amperes
0.48 0.45 0.210.36 1.16
0.026 0.02 0.010.015 0.15
3.3 3.97 1.921.75 7.5
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
14/21
480V Metal-Enclosed SwitchgearLV Power Circuit Breakers
13
Technical
Time/Current Characteristics of Static Trip III Trip Unit
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
15/21
14
Siemens 480 volt switchgear can beconfigured in many ways by combiningdifferent section types. Up to five verticalsections plus a transition section can beshipped together as a unit. If all verticalsections are not to be shipped as a unit,specifications need to be provided thatdescribe the limiting factors (e.g., lowdoor or narrow hallway).
Normal indoor vertical sections are 101in. (2565 mm) high and 60 in. (1524 mm)deep. A top-mounted hoist, which isshipped as an accessory in a separatecontainer, adds 2 in. (51 mm) for a totalinstalled height of 103 in. (2616 mm).
The outdoor switchgear assemblycontains the indoor assembly in an out-door housing. The overall height is 113in. (2870 mm) and the depth is 119.40 in.(3033 mm).
The major assembly sections include:
Transition Sections used as transi-tion to liquid filled transformer or tooutdoor dry type transformers.
Auxiliary Sections used as incom-ing bus duct or cable entrance when a
main breaker is not used. Main Sections used to contain
main breaker and may house meteringand feeder breakers.
Feeder Sections used to containfeeder breakers and other equipmentsuch as instrumentation.
Tie Sections used to contain tiebreaker and other equipment such asfeeder breakers.
480V Metal-Enclosed SwitchgearWeights and Dimensions
Dimensions
Transition Section For Liquid Filled andOutdoor Dry Type Transformers
RL-800
150 (68)
45 (20)
140 (64)
RLE-800
180 (82)
45 (20)
170 (64)
RLI-800
185 (84)
45 (20)
175 (80)
RL-1600
190 (86)
45 (20)
180 (82)
RLE-1600
195 (89)
45 (20)
185 (84)
RL-2000
220 (100)
45 (20)
210 (95)
RL-3200
300 (136)
50 (23)
290 (132)
RL-4000
360 (164)
50 (23)
350 (159)
RL-5000
445 (202)
55 (25)
425 (193)
RLE-2000
225 (102)
45 (20)
215 (98)
RLE-3200
305 (139)
50 (23)
295 (134)
RLE-4000
365 (166)
50 (23)
355 (161)
Operation
Manual
Electrical
AdditionalWeight forShipping
Element Type
Table 4.19 Breaker Element Weight in lbs. (kg)
RLF-800
205 (93)
45 (20)
195 (89)
RLF-1600
320 (145)
45 (20)
310 (141)
RLF-2000
335 (152)
45 (20)
325 (148)
RLF-3200
330(150)
50 (23)
290(132)
RFC-3200
50 (23)
390
(177)
450
(205)
475 (217)
55 (25)
RLF-4000
360(100)
45 (20)
350(95)
RLF-5000
445(202)
55 (25)
425(193)
RFC-4000
50 (23)
RFC-5000Operation
Manual
Electrical
AdditionalWeight forShipping
Element Type
Table 4.20 Fused Element Weight in lbs. (kg)
For use with RLF-3200 breaker.For use with RLF-4000 breaker.
For use with RLF-5000 breaker.
Fuses mounted on separate drawout carriage and locatedin separate compartment. For total weight, add weight ofbreaker element and separate fuse carriage.
550 (250)
500 (227)
61 (1549)
55 (1397)Outdoor
Indoor
Dimension Ain Inches (mm)
Weightin lbs. (kg)
Table 4.18
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
16/21
15
Tie Breaker Sections and Combinations Front Views
480V Metal-Enclosed SwitchgearAuxiliary / Breaker Section Dimensions
Dimensions
R30R22
Indoor
Outdoor
1000 (455) 1200 (545)
2000 (909) 2400 (1091)
Table 4.21Weight in lbs. (kg)
Auxiliary Section
Auxiliary Sections Front Views
R30R22
Indoor
Outdoor
1400 (636 ) 1900 (864)
2400 (1091) 3100 (1409)
R36
2210 (1005)
Table 4.22Connection Weights in lbs. (kg)
Breaker Section and
Weights shown do not include weight of circuit breakerremoveable elements. All weights are approximatebased on aluminum bus. For outdoor lineup, add
1200 lb (545 kg) to total weight of individual sections forend walls and hoist.
Main Breaker Sections Front Views
Feeder Breaker Sections and Combinations Front Views
Breaker Designations
A =RL- 800 / 1600 / 2000,RLF- 800 / 1600 / 2000,RLE- 800 / 2000, RLI-800
B =RL- 3200C = RLF- 3200 in one cell, with
fuse drawout (RFC-3200)in other cell
D =RLF- 4000 in one cell, withfuse drawout (RFC-4000)in other cell
E = RL- 4000, RLE-4000F = RLF- 5000 in one cell with
fuse drawout (RFC-5000)in other cell
G =RL- 5000
22 in. (559 mm) compartment only.
Feeder breakers located above tie breaker must beelectrically on opposite side of tie breaker fromfeeder breaker which is located below the breaker.
Dimensions in Inches (mm)
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
17/21
16
480V Metal-Enclosed SwitchgearIndoor Floor Plan, Side View
Dimensions
This transition required for liquid filled and outdoor dry type transformers only. Cable space is 13.2 in. (335 mm) in depth for bottom entry with circuit breaker in bottom compartment. (Refer to side view.)
Switchgear (5000A) Dimensions in Inches (mm)
Bolting Arrangement
Dimensions in Inches (mm)
Switchgear (Up to 4000A)
Indoor Side View
Indoor Floor Plan
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
18/21
17
Outdoor Floor Plan
480V Metal-Enclosed SwitchgearOutdoor Floor Plan, Side View
Dimensions
Dimensions in inches (mm)
Dimensions in inches (mm)
Cable space is 22.4 in. (569 mm) depth forbottom entry with circuit breaker in bottomcompartment.
Bolting Arrangement
Outdoor Bolting ArrangementType SR
(Side View)
30.0 (762 mm) Door
Hinges on Extension
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
19/21
18
This equipment specification guideprovides information for describing atypical metal enclosed low voltage powercircuit breaker switchgear assembly.Items or features that are non-standardbut required for a specific application arepreceded by (option). Items preceded orfollowed by a blank (__) require thatadditional data be provided in order tocomplete the specification.
General
The equipment to be supplied shall bemetal enclosed low-voltage power circuitbreaker switchgear with drawout circuitbreaker elements. All power circuitbreakers and assemblies shall beproduced by a single manufacturer andshall be designed, tested and manufac-tured in accordance with the standardsreferenced in this specification.
Codes and StandardsThe switchgear assemblies and power cir-cuit breakers shall comply with the codesand standards as indicated. Copies of cer-tified design tests shall be furnished ifrequested to confirm compliance.
ANSI / IEEE C37.13 Low-Voltage AC Power Circuit BreakersUsed in Enclosures
ANSI C37.16 Low-Voltage PowerCircuit Breakers and AC PowerCircuit Protectors PreferredRatings, Related Requirements, andApplication Recommendations
ANSI C37.17 Trip Devices for ACand General Purpose DC Low-Voltage Power Circuit Breakers
ANSI / IEEE C37.20.1 Metal-Enclosed Low-Voltage PowerCircuit-Breaker Switchgear
ANSI / IEEE C37.27 ApplicationGuide for Low-Voltage ACNonintegrally Fused Power CircuitBreakers (Using Separately MountedCurrent Limiting Fuses)
ANSI C37.50 Standard TestProcedures for Low-Voltage ACPower Circuit Breakers Used in
Enclosures. ANSI C37.51 Standard
Conformance Test Procedures forMetal Enclosed Low-Voltage ACPower Circuit-Breaker SwitchgearAssemblies
ANSI / NEMA 250 Enclosures forElectrical Equipment (1000 VoltsMaximum)
NEMA SG 3 Low-Voltage PowerCircuit Breakers
NEMA SG 5 Power SwitchgearAssemblies
(option) NEMA 210 SecondaryUnit Substations
UL 1066 Low-Voltage AC and DCPower Circuit Breakers Used in
Enclosures (Option) UL 1558 Metal-Enclosed
Low-Voltage Power Circuit BreakerSwitchgear
Assembly
The switchgear assembly shall be SiemensType R and is to be located indoors, with aNEMA 1 enclosure, (option) outdoor,NEMA 3R per specifications below andconstructed of multiple, metal-enclosed,ventilated sections. The front of each verti-cal section is to contain three or four com-partments with 14 gauge steel side sheetsand compartment barriers of 11 gauge
steel. A double thickness of 14 gauge steelis to be provided between vertical sec-tions. The side sheets shall be full heightand depth to provide a full metal barrierseparating the rear cable compartmentsbetween sections. End sections shallinclude provisions for main bus extensionand installation of future vertical sections.The design shall incorporate preformedsteel channels, angles, and side sheetsbolted together and reinforced to form arigid, self-supporting, compact assembly.
Horizontal barriers are to be provided to formindividual circuit breaker or metering com-partments. Circuit breaker compartmentsare to be barriered from the bus compart-ment through a primary disconnect assem-bly. Each circuit breaker or metering com-partment shall be provided with a hingedfront door secured with rotary latches requir-ing no tools to operate.
Circuit breaker compartments shall includestationary primary contact disconnects.The primary disconnects shall be copper,silver-plated at connection points and shallbe of one piece construction. The upperset of disconnects shall bolt directly to themain bus and, for feeder circuit breakers,the lower set shall extend to the rear cable
area and shall be insulated where theypass through the main bus compartment.Primary disconnects shall be sized for themaximum continuous current of the circuitbreaker which will be located in the com-partment. Interlocks shall be providedwhich will prevent a circuit breaker ele-ment of the incorrect frame size or inter-rupting rating from being inserted into thecompartment. A stationary circuit breakerframe grounding contact shall be providedwhich shall be visible with the circuitbreaker installed in any position.
Secondary control contacts, whenrequired, shall be located in the circuitbreaker compartment and shall be of thesliding contact, silver-plated copperdesign. Barriers shall be providedbetween terminal points. The secondarycontrol contacts shall engage thedrawout circuit breaker element in theconnected and test positions.
Control circuit fuses for electrically oper-ated circuit breakers shall be located onthe side of the circuit breaker compart-ment and shall be contained in a dead-front, pull-out fuse block with a clearcover. Withdrawing the cover from thefuse block shall automatically remove thecontrol circuit fuses and hold them cap-tive. The fuse block cover shall includeprovisions for being installed in thereverse position in order to maintain theopen control circuit for testing or mainte-
nance purposes while continuing to holdthe fuses captive.
All control wiring within the assemblyshall be continuous and shall terminateon each end at a suitable terminal block.Control wiring shall be 14 gauge, strand-ed, type SIS, and shall be labeled at eachend with sleeve type wire markers. Wiremarkers shall be machine imprinted withthe wire name as indicated on the wiringdiagrams. Wrap on wire markers will notbe accepted. Terminals shall be insulatedlocking fork or ring tongue type exceptwhere connecting to components that donot accept these terminations. Control
wiring for external connections shall beterminated in the rear cable area for easeof access. (Option) Metal covers shall beprovided over control wiring troughswhere they pass through the powercable termination area. (Option) Metalcovers shall be provided over terminalblocks located in the power cable termi-nation area.
Bus
Main bus shall be three-phase, ___ wire___ ampere copper with silver-platedconnection joints (option) aluminum withwelded connection points (option) copper
with tin-plated connection points.(Option) Neutral bus rating shall be ___%of the main bus current rating and shallbe located centrally in the structure forease of terminating cables whetherentering from above or below. 600 voltclearances shall be maintained in all hori-zontal and vertical buses such that insula-tion is not required. The main horizontalbus shall be run in a vertical, edge-to-edge arrangement for high short circuitstrength. Access to the rear cable termi-nation area shall be possible without
480V Metal-Enclosed SwitchgearGuide Form Specifications
Specifications
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
20/21
reaching over the main and vertical bus.Bus bracing shall be equal to the shortcircuit interrupting rating of the lowestrated non-fused circuit breaker applied inthe assembly. A 0.25 in. (6 mm) by 2.00 in.(51 mm) copper ground bus will be provid-ed. Barriers shall be provided which isolate
the rear cable termination compartmentfrom the adjacent vertical section. (Option)Barriers shall be provided to isolate therear cable area from the main bus area.(Option) Barriers shall be provided to sepa-rate the incoming line connections fromthe main horizontal and vertical bus.
Circuit Breakers
Circuit breakers shall be Siemens Type RLand shall be either electrically or manuallyoperated as indicated on the data sheets(or drawings). Minimum interrupting rat-ings will be as defined on the data sheets(or drawings) and shall meet or exceed the
interrupting ratings as defined by ANSIstandards. (Option) Fused circuit breakersare to be the integrally fused type throughthe 2000 ampere frame size. 3200 through5000ampere frame sizes are to be sup-plied with separate drawout fuse carriageswhich are mounted in the same verticalsection as the circuit breaker element andare to be key interlocked with the circuitbreaker element such that the fusecarriage cannot be withdrawn unless thecircuit breaker is locked in the openposition. All fused circuit breakers are to beequipped with blown fuse lockout devicesto prevent single phasing. The application
of fused circuit breakers shall not reducethe amount of rear cable termination spacewhich would have been provided with non-fused circuit breakers.
Circuit breakers are to be 600 volt classwith nominal ratings as dictated by thesystem voltage. Circuit breakers shall bethree-pole, single-throw, operated by astored energy mechanism, with arcquenchers, main and arcing contact struc-ture, a three-phase solid state trip overcur-rent trip unit, trip actuator, three single ratiotripping sensors, and primary disconnect-ing devices. In addition, the circuit breakerelement shall have connected, test, and
disconnected position indicators, springcharged/discharged indicators, and circuitbreaker open or closed indicators all ofwhich shall be visible to the operator withthe compartment door closed. It shall bepossible to rack the circuit breaker elementfrom the disconnect to the connected posi-tion with the compartment door closed.Interlocks will be provided that preventracking a circuit breaker unless the circuitbreaker is open and that prevent closing acircuit breaker unless it is in the connectedor test position.
Solid State Trip Units
Solid state trip units shall be Siemens
Static Trip III (basic device)
(Option) Static Trip IIIC (addscommunications capability)
(Option) Static Trip IIICP (adds
communications and power metering)
(Option) Static Trip IIICPX (addscommunications, power metering,and relaying functions)
Trip units shall be interchangeable so thatany trip unit can be used with any framesize circuit breaker. The basic trip unit shallbe a self powered, micro-processor baseddevice that measures true RMS currents.Long time, short circuit or ground fault tripindication shall be maintained for a mini-mum of 48 hours without the need for aseparate battery or relay. Peak sensingdevices will not be accepted. All adjust-
ment setting switches shall be digitallyencoded type with gold contacts. (Note:Refer to catalog section SGBR-3169B forspecifications on the Siemens Static Trip IIItrip unit family and all associated options).
Instrumentation and Metering
A wide variety of user defined meteringand instrumentation options are available.They include Siemens 4720, 4700 & 4300power meters, Siemens Static Trip III tripunits, and traditional analog devices. Formore detailed specification information onSiemens devices refer to bulletins SGFL3181B, 3161A, and 3151B for 4720, 4700,and 4300 power meters, respectively; andSGBR-3169B Static Trip III Micro-processorBased Tripping System. If one of theoptions selected requires separate voltageand current transformers, such as theSiemens 4700 power meter, the followingmay be used to define these devices.
Current transformers shall have standardaccuracy class ratings as defined by ANSIC37.20.1 and shall be mounted directly onthe stationary primary disconnects in thecircuit breaker compartment. Voltage trans-formers shall have a minimum 150VAthermal rating and shall be located in ametal enclosed metering compartment
and shall be protected on the primary sidewith current limiting fuses.
Outdoor
(Option) Outdoor, NEMA 3R, walk-in,weatherproof construction is to be provided.The complete assembly is to rest on aformed steel base provided under eachvertical section and running perpendicularto the depth of the switchgear. The under-side of the enclosure and base structure isto be undercoated with coal tar emulsionmaterial.
Front and rear doors are to be gasketedand hinged. Front doors, located at eachend, are to include panic release door hard-ware, three point latches, and provision forpadlocking. Rear doors shall be bolted. Allexterior hardware shall be stainless steel.
An indoor access aisle approximately 42 in.(1067 mm) deep and accessible fromeither door is to be provided at the front ofthe switchgear line-up for inspection andtesting of the circuit breakers and associat-ed equipment. A hand-operated travelinghoist, mounted above the switchgear is tobe provided for changeout of circuit break-ers. The aisle is to have an extension oneach end to accommodate end unit doorsthat have instrumentation and metering,and to provide additional space for circuitbreaker handling.
The switchgear is to include space heatersto prevent condensation of moisture. The
aisle shall be provided with incandescentlights, convenience receptacle, and an ON/ OFF switch at each end to control thelights.
Finish
During construction, the structural steelparts, panels, and compartments shall beprepared for painting by a five-stage washsystem consisting of an alkaline cleaner,fresh water rinse, iron phosphate treat-ment, fresh water rinse, and non-chromatesealer. After cleaning and stabilization, thesteel parts shall be coated with a ther-mosetting polyester powder applied withelectrostatic equipment at a nominal 2 milsdry film thickness and then cured at 425degrees Fahrenheit for 20 minutes. Paintcolor shall be ANSI 61 light gray. The paintfinish shall have a pencil hardness of 2H, agloss as defined by ANSI D523-78 of 45-55%, a salt spray rating per ASTM B-117-73 of 600 hours, and shall be outdoor ratedper UL1332.
Accessories
The following accessories are to beprovided:
crank for racking circuit breakers
lifting yoke for circuit breakers
container of touch-up paint (optional) portable test set, type PTS4
overhead hoist for indoor switchgear
(optional) test cabinet
Testing
Production tests in accordance with ANSIC37.20.1, ANSI C37.50, ANSI C37.51 andNEMA SG 5 shall be performed on thecompleted assembly. Certified copies ofthese tests shall be furnished uponrequest.
19
480V Metal-Enclosed SwitchgearGuide Form Specifications
Specifications
7/27/2019 480V_ Metal-Enclosed_Switchgear_ Selection _and_ Application_ Guide_ 3061C.pdf
21/21
Siemens Energy & Automation, Inc.
P.O. Box 29503
Raleigh, NC 27626-0503
1998 Siemens Energy & Automation. All rights reserved. 5M 11/98 TDSIEMENS is a registered trademark of Siemens AG.ACCESS and Static Trip III are trademarks of Siemens Energy & Automation, Inc.
Printed in U.S.A.