Generator Breaker
Generator circuit breakers offer drawout convenience to simplify maintenance or replacement.
Electrically-operated, front servicable, drawout, breakers are available in 800 amp to 3000 amp frame sizes.The Square D, NW, 5.0P insulated case circuit breakers are UL 489 listed and are included with an adjustable long time delay, short time delay, instantaneous overcurrent trip and ground fault alarm.

Additional features include 120VAC electrical operation, 24 VDC shunt trip, bell alarm, 4a and 4b auxiliary contacts, a protective cover for the manual close pushbutton, and instantaneous and ground fault indications.

Square D Micrologic 5.0P Trip units provide monitoring of electrical parameters as well as visual indication. Trip settings are adjustable from 40 % to 100% of the generator breaker frame size and a Modbus® RTU port provides communications to the Emergency Power Communication System.
Generator Breaker and Bus Ampacity1,3
Gen Size
(kw@480V)
Breaker Frame
(Amps)
Breaker Trip
(Amps)2
Phase & Neutral
Bus (Amps)
Ground Bus
(Amps)
230 - 500
800
800
2500
1000
300 - 650
1200
1000
2500
1000
350 - 800
1200
1200
2500
1000
450 - 1000
1600
1600
4000
1000
550 - 1250
2000
2000
4000
1000
700 - 1500
2500
2500
6000
2000
800 - 2000
3000
3000
6000
2000
1. Square D MASTERPACT® NW Insulated Case Circuit Breaker
2. Adjustable Trip Settings 40% to 100% of Breaker Frame Size
3. Bus bracing level 100,000 amperes.
© Copyright 2001-2009 ASCO Power Technologies, LP
Florham Park, NJ 07932