G u ide Form Specifications
General
The individually mounted low voltage power circuit
breaker shall consist of an electrically and mechanically
trip-free circuit breaker element.
The circuit breaker shall be of the draw-out type capable
of being racked to the disconnect position with the door
closed.
The circuit breaker shall meet ANSI C37. 1 3 , C37 . 1 6 and
C37 .50 and be UL listed.
Interlocks will be provided to prevent connecting or dis
connecting the circuit breaker unless the breaker is open.
The breaker shall be prevented from being closed during
any racking operation. A test position shall be provided to
permit operating the breaker while it is disconnected from
the power circuit.
MicroVersaTrip RMS-9 trip devices shall
i nclude:
•
True rms current sensing for long time character
istics.
•·
Time current characteristic adjustments of the fixed
point type, gold plated for maximum reliability and
setting accuracy.
•
All internal solid-state circuitry of epoxy conformal
coated to resist environmental contamination.
•
Rating plugs for application flexibility.
•
Adjustable current setting of 0.5 to 1 . 1 of sensor
tap.
•
Adjustable long-time delay with four bands.
•
Integral long-time timing light.
•
Adjustable instantaneous.
•
I ntegral test provisions.
Optional characteristics
•
True rms sensing for short time characteristics
•
Short-time pick up and delay with Ft in or out
•
High range instantaneous
•
Ground fault pick up and delay with Ft in or out
•
Self-powered overload, short circuit, and ground
fault target indicators that continue to give indication
even when control power has been lost
•
Zone selective interlocking
Other
AKR
Circuit Breaker Publications
General Installation and Maintenance
G E�)-5019
G EK-64459
G EK-64460
G EI-50299
G EK-7303
G EI-86135
GEK-7310
AKR-30S, AKRU-30S
AKR-30/50/T50
AKR-75/100 and AKS-50
AK-25
AK-50, AKT-50, AK-75, -100
ECS/SST Supplement
AKR-3/3A-50
Installation and Operating Installations
GEK-7302
G EI-86150
GEI-86151
G EI-86160
GEI-86157
60
AK-25/50, AKT-50, AK-75/1 00
AKR-30/50, AKRT-50
AKR-75/1 00
AKS-50, AKST-50
ECS, 1 8, 2A Trip Devices
Detailed
•
This specification covers General Electric Company low
voltage power circuit breakers, types AKA, AKRT, or
AKRU.
•
The continuous current frame
ratings shall be
800, 1 600,
2000, 3200, 4000.
•
Circuit breakers shall be manually or electrically operated.
•
Control voltage for electrically operated breakers shall be :
•
Volts:
•
Circuit breakers rms symmetrical interrupting ratings:
240VAC kA
480VAC kA
600VAC
kA
250VDC
kA
•
Overcurrent trip devices shall be solid-state type
MicroVersaTrip® RMS-9.
•
Each solid-state trip unit shall be equipped with the follow
ing field adjustable time current characteristics.
-Adjustable current, and long-time delay
-Integral long-time timing light
-Instantaneous, standard or high range
-Short-time pick up and delay with l2t in or out
-Ground fault pick up and delay with
l2t
in or out
-Target indicators, overload, short-circuit, and ground
fault
•
Each circuit breaker shall be equipped with the following
accessories:
-Shunt trip-Voltage
-Undervoltage release-
-Undervoltage release with time delay-
-Overload bell alarm switch
-Lockout device
-Auxiliary Switch:
Number of contacts:
Normally open "a" type
Normally closed "b" type
-Operation counter
•
Portable MicroVersaTrip RMS-9 test kit
Testing Instructions
GEK-64464
G EK-73300
G EK-64454
G EK-7309
GEK-7301
MicroVersaTrip Test Set TVTS1
ECS/SST Test Set TAK-TS2
ECS/SST Test Set TAK-TS1
Power Sensor High Current Testing
Power Sensor Test Set
Renewal Parts
G EF-4527
GEF-4552
GEF-41 49
GEF-4150
GEF-4395
GEF-4396
AKR-30/50/T50
AKR-75/100
AK-25
AK-50
AK-75
AK-100
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