Electrical distribution needs are continuously evolving in residentional, commercial andIndustrial sectors. Improved operational safety, continuity of service, greater convenience and operating cost have assumed a tremendous significance. Miniature circuit breakers have been designed to continuously adapt to these changing needs.

Range6A to 40A "B" Curve0.5A to 63A "C" Curve0.5A to 63A for "DC" Application

ExecutionSingle Pole (1P)Single Pole & Neutral (1P+N)Double Pole (2P)Three Pole (3P)Three Pole & Neutral (3P+N)Four Pole (4P)

SpecificationIEC/EN 60898

Feature • Precise hammer action• 15 Plates Arc Chute for effective arc quenching• Longer electrical life• Wide range• Value for money• Low power consumption, thus cost effective & energy saving

AccessoriesAuxiliary SwitchShunt trip

• UNIFORM 10KA BREAKING CAPACITY FOR "B" AND "C" CURVE

• LOW POWER CONSUMPTION, THUS COST EFFECTIVE & ENERGY SAVING

• SUITABLE FOR DC AND FOR A WIDE FREQUENCY RANGE OF 50Hz-400Hz APPLICATION

• "FINGER SAFE" TERMINALS-IP20 DEGREE OF PROTECTION

• ARC CHUTE FOR EFFECTIVE ARC QUENCHING

• SILVER GRAPHITE CONTACTS FOR ENHANCED LIFE

MINIATURE CIRCUIT BREAKER

3

HOUSING:• The housing of Decovolt MCB is Injection Moulded from special grade PBT as per international specifications.• The housing and other moulded components are fire retardant, anti-tracking and non hygroscopic.• The Housing can withstand high temperature and is impact resistant.

CONTACTS:Contacts are made of special silver inlaid into copper strip, ensuring higher life and maximum safety against contact welding and erosion. These contacts have low contact resistance resulting into low watt loss.

CURRENT LIMITING ACTION: The high speed current limiting action ensures that the MCB operate before the full prospective fault current is allowed to develop. Under fault conditions, damage can be sustained to the installation and associated equipment due to the amount of energy that passes before the current is completely interrupted. The total energy let through depends on the value of current and the time for which it flows. The high speed current limiting action of DECOVOLT MCB ensures that the energy let through and any subsequent damage is minimized. This reduced LET THROUGH ENERGY (Class 3 as per BSEN 60898) assists greatly with both back-up and discrimination considerations.

OPERATING MECHANISM: DECOVOLT MCB have a quick make and break trip free mechanism. In the event of an over current or short circuit the MCB automatically interrupts all poles even if the MCB toggle is held in ON position, the handle always indicates the correct contact position.

MODERATE OVERLOAD CONDITION: Detection of moderate Over load conditions is achieved by the use of a Bimetal Overload Relay, which deflects in response to the current passing through it The Bimetal Relay moves against the trip bar releasing the trip mechanism.

SHORT CIRCUIT CONDITIONS: When the current flowing through the MCB reaches a predeter-mined level, the solenoid in Magnetic coil directly pulls in the plunger, which releases the trip mechanism.

PERFECT CONECTIONS: The design of termi-nals makes the wiring easier. A combination box type terminal with combination head screws on both sides with deep serrations ensures sparkles and firm connections.

Outgoing Terminal

Body

Latch

Arc-chutes Holder

Solenoid

Arc-chutes

Arc-runner

Arc-chutes Holder

Fixed Contact

Moving Contact Arm

Incoming Terminal(Dual Termination)

MINIATURE CIRCUIT BREAKER

Internal View of MCB

4

MINIATURE CIRCUIT BREAKER

TECHNICAL INFORMATION

STANDARD CONFORMITY IEC 60898:2002 IEC 60947-3:2001TYPE/SERIES CB B

Nos of Poles (Execution)RATED SHORT CIRCUITBREAKING CAPACITY Ka

1P,1P+N,2P,3P,3P+N,4P1P,1P+N,2P,3P,3P+N,4P 1P,1P+N,2P,3P,3P+N,4P

UTILIZATION CATEGORY

(3-5) InMAGNETIC RELEASESETTING (3-5) In (3-5) In

660RATED INSULATIONVOLTAGE(Ui) 660 660

4RATED IMPULSEVOLTAGE (Uimp)ELECTRICAL / MECHANICALENDURANCE

4 4

RATED FREQUENCY (f) 5050 50

1010 10

RATED VOLTAGE (AC) (Ue) 240/415240/415 240/415RATED CURRENT (In) 6-40*6-40* 6-40*

LESS THAN 32 Amps 2000020000 20000MORE THAN 32 Amps 1000010000 10000AMBIENT TEMPERATURE - 5 to + 55- 5 to + 55 - 5 to + 55

VIBERATION g 33 3SHOCK 40MM FREE FALL40MM FREE FALL 40MM FREE FALLPROTECTION CLASS IP 20IP 20 IP 20INSTALLATION POSITION VERTICAL/ HORIZONTALVERTICAL/ HORIZONTAL VERTICAL/ HORIZONTALMOUNTING CLIP ON DIN RAILCLIP ON DIN RAIL CLIP ON DIN RAILCASE & COVER MOULDED, FLAME RETARDANT THERMOPLASTIC MATERIAL

TERMINAL CAPACITY(MAX) sq.mm 2525 25

MCB ISOLATORTITLE

1P SINGLE POLE1P+N SINGLE POLE NEUTRAL2P DOUBLE POLE3P THREE POLE3P+N THREE POLE NEUTRAL4P FOUR POLE

*** CURRENT RATINGS - 0.5, 1,2,3,4,5,6,8,10,16,20,25,32,40,50,63"B" CURVE MCB's ARE AVAILABLE ON REQUEST

5

MINIATURE CIRCUIT BREAKER

SELECTION

SELECTION OF MCB FOR MOTOR PROTECTION

S.NO KW HP

3017 51- 51 63125-38- 38 63125-32- 32 50125-27- 27 4063100-21- 21 325050-

14.4125 14.4 2540404711.280 11.2 163225268.280 8.2 102020246.363 6.3 101616204.450 - --1017.53.532 - --1011.82.625 - --68.7220 - --36.2

1.816 - --34.81.210 - --23.51.210 - --23.20.910 - --22.8

C DCC

221618.515151410137.5125.5113.7510

392.281.571.16

1.011.472.012.954.025.037.3710.0513.420.1124.829.4940.21

0.7550.740.5540.50.3730.340.2520.240.181

FULL LOADCURRENT

FULL LOADCURRENT

3 PHASE 400V ASSISTEDSTARTING STAR DELTA

"B" SERIES"B" SERIES

"B" SERIES"B" SERIES

"C" SERIES"C" SERIES

TYPE OFMCB

LampWatt

No oflamps

Rating(A)

20W 812

11.5

40W 21012

0.52

2.5

100W 124

11.52.5

60W 148

12

0.51.534

80W 1258

12

0.51245

CURRENTRATING OF MCB

CAPACITY/WATT(Load)(240V-1pH)APPLIANCES

Fresh hold application

"B" SERIES"B" SERIES

"B" SERIES"B" SERIES"B" SERIES"B" SERIES

"B" SERIES"B" SERIES"B" SERIES"B" SERIES"C" SERIES

"C" SERIES

WASHING MACHINEWASHING MACHINEWITH HEATER

"C" SERIES"C" SERIES"C" SERIES

8A10A

32A10A

3A4A

6A8A

6A10A16A32A

6A10A6A10A2A

8A

10A16A20A

1200W1500W

4500 W1750 W

165 litres350 litres

750W1250W

1000W2000W3000W6000W

AUTO TOASTER ( 2 SLICES)ELECTRIC KETTLE

" B " series MCB is used forlighting applications

ELECTRIC IRON

WATER HEATERSTORAGE / INSTANT

750W2000W1000W2000W300W

1300W

1.0 tonnes1.5 tonnes2.0 tonnes

OVEN/GRILLER

REFRIGATOR

OVEN/GRILLERHOT PLATE ONLYROOM HEATER

AIR CONDITIONER

MCBSELECTION

MCBSELECTION

1 PHASE 230V DOLSTARTING

FULL LOADCURRENT

MCBSELECTION

3 PHASE 400V DOLSTARTING

NOTE: One lighting circuit can have up to 800W or up to 10 lighting pointsOne power circuit can have up to 2000W or 1 power point

6

1000050003600

1000

100

10

11.131.45 2 2.55 3 5 10 14 20 28 50

1

0.1

0.01

Tim

e in

Sec

onds

Multiple of Rated Current

Limit Specified in IEC-60898-1-2002In : Rated Current B Type - 0.5A to 100A C Type - 0.5A to 100A

Reference Calibration Temp-30˚C

Lower Limit as per Standard

In > 32A

In < 32A

B-Type C-Type

Upper Limit as per Standard

1000050003600

1000

100

10

11.131.45 2 2.55 3 5 10 14 20 28 50

1

0.1

0.01

Tim

e in

Sec

onds

Multiple of Rated Current

Limit Specified inIEC-60898-1-2002In : Rated CurrentB Type - 0.5A to 100AC Type - 0.5A to 100A

Reference Calibration Temp-30˚C

Lower Limit as per Standard

In > 32A

In < 32A

B-Type

C-Type

Upper Limit as per Standard

60

CurrentLimiting

MCB

Zero pointExtinguishingMCB

Un = Mains VoltageID = Let - through short circuit current

UB = Arc VoltageIp = Prospective short circuit current

U/V

U/V

U/V

50

40

30

20

10

0.7 0.6 0.9 1.0 1.1 1.2 1.3 1.4

-10

0

Correction FactorReference Calibration Temp. 30˚C

Am

bien

t Tem

p.˚C

Temperature Compensation GraphDecovolt MCB Vs Zero Point

Extinguishing MCB

Tripping Characterstics CurveDC MCB Type B & C

Tripping Characterstics CurveType B & C

TRIPPING CHARACTERSTICS CURVES

MINIATURE CIRCUIT BREAKER

7

CURRENT RATING (A)0.5123456

1016202532405063

CURRENT RATING (A)0.5123456

1016202532405063

CURRENT RATING (A)0.5123456

1016202532405063

"B CURVE" CAT NODVBDP105

DVBDP1001DVBDP1002DVBDP1003DVBDP1004DVBDP1005DVBDP1006DVBDP1010DVBDP1016DVBDP1020DVBDP1025DVBDP1032DVBDP1040DVBDP1050DVBDP1063

"C" CURVE CAT NODVCDP105

DVCDP1001DVCDP1002DVCDP1003DVCDP1004DVCDP1005DVCDP1006DVCDP1010DVCDP1016DVCDP1020DVCDP1025DVCDP1032DVCDP1040DVCDP1050DVCDP1063

"C" CURVE CAT NODVASP105

DVASP1001DVASP1002DVASP1003DVASP1004DVASP1005DVASP1006DVASP1010DVASP1016DVASP1020DVASP1025DVASP1032DVASP1040DVASP1050DVASP1063

"B CURVE" CAT NODVBSP105

DVBSP1001DVBSP1002DVBSP1003DVBSP1004DVBSP1005DVBSP1006DVBSP1010DVBSP1016DVBSP1020DVBSP1025DVBSP1032DVBSP1040DVBSP1050DVBSP1063

"C" CURVE CAT NODVCSP105

DVCSP1001DVCSP1002DVCSP1003DVCSP1004DVCSP1005DVCSP1006DVCSP1010DVCSP1016DVCSP1020DVCSP1025DVCSP1032DVCSP1040DVCSP1050DVCSP1063

SINGLE POLE

SINGLE POLE - N

DOUBLE POLE

MINIATURE CIRCUIT BREAKER

8

CURRENT RATING (A)0.5123456

1016202532405063

CURRENT RATING (A)0.5123456

1016202532405063

CURRENT RATING (A)0.5123456

1016202532405063

"B CURVE" CAT NODVBFP105

DVBFP1001DVBFP1002DVBFP1003DVBFP1004DVBFP1005DVBFP1006DVBFP1010DVBFP1016DVBFP1020DVBFP1025DVBFP1032DVBFP1040DVBFP1050DVBFP1063

"C" CURVE CAT NODVCFP105

DVCFP1001DVCFP1002DVCFP1003DVCFP1004DVCFP1005DVCFP1006DVCFP1010DVCFP1016DVCFP1020DVCFP1025DVCFP1032DVCFP1040DVCFP1050DVCFP1063

"C" CURVE CAT NODVATP105

DVATP1001DVATP1002DVATP1003DVATP1004DVATP1005DVATP1006DVATP1010DVATP1016DVATP1020DVATP1025DVATP1032DVATP1040DVATP1050DVATP1063

"B CURVE" CAT NODVBTP105

DVBTP1001DVBTP1002DVBTP1003DVBTP1004DVBTP1005DVBTP1006DVBTP1010DVBTP1016DVBTP1020DVBTP1025DVBTP1032DVBTP1040DVBTP1050DVBTP1063

"C" CURVE CAT NODVCTP105

DVCTP1001DVCTP1002DVCTP1003DVCTP1004DVCTP1005DVCTP1006DVCTP1010DVCTP1016DVCTP1020DVCTP1025DVCTP1032DVCTP1040DVCTP1050DVCTP1063

THREEE POLE

THREEE POLE - N

DOUBLE POLE

MINIATURE CIRCUIT BREAKER

9