GE Industrial Solutions

Be Prepared.Switch power sources quickly and efficientlywith Automatic Throwovers.

Three-Breaker Automatic Throwover Switchboard Connection

Key Features

• Available up to 4000A

• Available voltages: 480/277V 3P4W 208/120V 3P4W 480V 3P3W 240V 3P3W 600/347V 3P4W 600V 3P3W

• GE electrically operated Main and Tie devices

• NEMA 1 or NEMA 3R construction

• Programmable Logic Controllers (PLCs)

• Uninterruptable Power Supply (UPS) for controls

• LED type lights

• Keyed selector switch for Man/Auto and Test

• Three-phase undervoltage and phase failure monitored on both sources

• Overcurrent trip lockout

• Interlocking to prevent paralleling sources

• UL Listed (UL 891, Switchboards)

• Advanced configurations and touch screens are options that may be added with factory quotation support

Power outages are unpredictable. And they can bring your facility to a halt – for an unknown length of time.

Be ready. With the Automatic Throwover switchboard connection from GE, you’ll be ready to get the power – and your operation – back up and running quickly.

Utilize the Three-Breaker Automatic Throwover Connection with main-tie-main open transition applications when two sources are provided and the tie breaker is normally open. Instead of manually switching from Source 1 to Source 2 with key locks, allow the work to be done automatically with our Three-Breaker Automatic Throwover Connection.

Automatic backup power saves both labor and downtime costs. This is a logical, cost-efficient solution for anyone who needs to quickly and easily switch power sources during an outage – especially retail, commercial, health care, educational and manufacturing facilities.

The Three-Breaker Automatic Throwover Switchboard Connection is designed for use with a sectionalized bus power circuit, where sources 1 and 2 are normal sources. A normally open bus tie breaker connects the two sections of the Main bus.

ControlPLC

Load Load

Source 1 Source 2

Norm Breaker Alt

Control PanelControl switches and indicating lights are mounted on the Automatic Throwover cover. These devices include the breaker control switches, test switch, Manual/Automatic selector switch, and lights to indicate breaker status (open, closed, or tripped on overcurrent), source power available and manual mode of operation.

Standard and Optional Features• Logic control is provided through a

GE Intelligent Platforms PLC with flash backup. The PLC is programmed in Proficy* Machine Edition.

• GE electrically operated Main and Tie devices

• Normal power sources are monitored by adjustable voltage sensing relays, which detect a drop in voltage below a predetermined level. The standard settings are 75% dropout and 90% pickup. Other calibrations are available in a range of 75-100% dropout and 85-99% pickup.

• PLC time delay (factory-set at 5 seconds) before automatic throwover from normal to alternate

source is provided to override momentary outages.

• The Manual/Auto keyed selector switch sets the mode of operation:

- Manual position: disconnects automatic control and enables manual control of breakers.

- Auto position: enables fully-automatic operation and disconnects manual control of breakers.

• The breaker control switches permit closing and tripping of breakers when the manual/auto selector switch is in “Manual” position

• Breakers are electrically interlocked (via PLC program and hard-wired interlocks) to prevent the sources from being paralleled. All breakers may be in the “Open” position, but only two can be in the “Closed” position simultaneously.

• Bypass switches on Drawout breakers disconnect automatic closing and tripping control from a fully withdrawn breaker.

• Manual retransfer to normal – instead of automatic – after the retransfer timing period is readily accomplished with the standard controls. Then, the load may be retransferred back to the normal source by using the breaker control switches to

trip the alternate (bus or tie) breaker and close the normal breaker.

• Phase Failure Relay (PFR) protection is designed to protect against phase loss and phase unbalance in a power system. The output contacts change their normal state only when a phase loss or unbalance occurs for longer than the preset trip delay. The PFR relay operates in conjunction with the UV relay to initiate the throwover process and automatically resets upon restoration of normal power. The PFR has adjustable time delay settings of 1 to 10 seconds (factory-set at minimum setting).

• The control panel’s Test position simulates loss of phase and causes throwover to alternate source, as long as the test switch is left in the “Test” position while the Manual/Auto switch is set to “Auto.” The load will be supplied from the alternate source until the switch is turned back to “Normal.”

• When a breaker trips on overcurrent, it will be locked out electrically and mechanically to prevent re-closure until manually reset.

Color Automatic Throwover

Green Breakers open

Red Breakers closed

Amber Breaker tripped by overcurrent

White Source power available

Blue Manual mode of operation

Color UPS (if used)

White UPS on

Green PLC control power available

*Indicates a trademark of the General Electric Company and/or its affiliates. Information provided is subject to change without notice. Please verify all details with GE. All values aredesign or typical values when measured under laboratory conditions, and GE makes no warranty orguarantee, express or implied, that such performance will be obtained under end-use conditions.

4.15 GEA-10261C

GE Industrial Solutions 41 Woodford Avenue Plainville, CT 06062 1-800-431-7867 www.geindustrial.com

Typical OperationAutomatic Operation – Keyed selector switch on “Auto:”

1. When one normal source fails, its load is transferred to the alternate source

2. When one normal source is restored, retransfer takes place automatically after delay

3. If manual retransfer is preferred, turn the keyed selector switch to “Manual” after transfer to alternate source

4. Testing – use keyed test switch to simulate loss of normal or alternate source

Manual Operation – Keyed selector switch on “Manual:”

1. Use breaker control switches to transfer loads

Overcurrent Trip Lockout – to reset, push the appropriate breaker trip button.

Control Panel Operating Lights

Trusted Solutions Have confidence that your automatic throwover will work properly when needed. Contact GE Industrial Services to test, configure, and maintain your power delivery system.

UPS ON

WHITE

1 2 3

MAIN #1 CLOSED TIE CLOSED MAIN #2 CLOSED

RED EDRRED

MAIN #1 TRIPPED TIE TRIPPED MAIN #2 TRIPPED SOURCE #1 AVAIL.

AMBER AMBER AMBER

PLC

WHITE

CONTROL POWER

GREEN

MAIN #1 OPEN TIE OPEN MAIN #2 OPEN SOURCE #2 AVAIL. MANUAL MODE

GREEN GREEN GREEN WHITE BLUE

UPSENABLE

UPSBYPASS

OPEN CLOSE OPEN CLOSE CLOSEOPEN AUTOMANUAL TEST 1NORMAL

TEST 2

Notes: 1. Ships in bypass. 2. Key-operated switch. Key removable in all three (3) positions. 3. Key-operated switch. Key removable in both positions.