GE
Industrial Solutions
Be Prepared.
Switch power sources quickly and efficiently
with Automatic Throwovers.
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
Three-Breaker
Automatic Throwover
Switchboard Connection
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.
Control Panel
Control 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
PLC
Control
Load
Load
Source 1
Source 2
Norm Breaker
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
Alt
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.
Typical Operation
Control Panel Operating Lights
Automatic 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
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
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.
UPS ON
MAIN #1 CLOSED
TIE CLOSED
MAIN #2 CLOSED
WHITE
RED
RED
RED
MAIN #1 TRIPPED
TIE TRIPPED
MAIN #2 TRIPPED
SOURCE #1 AVAIL.
AMBER
AMBER
AMBER
WHITE
PLC
CONTROL POWER
MAIN #1 OPEN
TIE OPEN
MAIN #2 OPEN
SOURCE #2 AVAIL.
MANUAL MODE
GREEN
GREEN
GREEN
GREEN
WHITE
BLUE
UPS
ENABLE
UPS
BYPASS
OPEN
CLOSE
OPEN
CLOSE
OPEN
CLOSE
1
TEST 1
TEST 2
NORMAL
MANUAL
AUTO
2
3
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.
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.
GE
Industrial Solutions
41 Woodford Avenue
Plainville, CT 06062
1-800-431-7867
www.geindustrial.com
*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 are
design or typical values when measured under laboratory conditions, and GE makes no warranty or
guarantee, express or implied, that such performance will be obtained under end-use conditions.
4.15 GEA-10261C