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Square D > On-line Catalog > Products > 03 Molded Case Circuit Breakers and Enclosures > Ground-fault Protection: Micrologic® Add-on Ground-fault Module (GFM)and Ground Censor® Type GA—600 Vac	Search

Supplemental and Obsolescence Digest 174

Ground-fault Protection

Micrologic® Add-on Ground-fault Module (GFM)
and Ground Censor® Type GA—600 Vac

Class 931, 940, 960

Micrologic® Add-on Ground-fault Module (GFM)

The Micrologic ground-fault module (GFM) is a UL Listed circuit breaker accessory for equipment protection. It is a combination ground-fault relay and ground-fault sensing device.

Micrologic Add-on Ground-fault Module Features:

●	Used in combination with the FA, KA, FC, KC, FI, and KI type circuit breakers with a ground-fault shunt trip factory installed (add the suffix “G” to the circuit breaker)

●	Adjustable ground-fault pickup levels

●	Adjustable ground-fault time delays

●	Integral ground fault push-to-test feature and ground-fault indicator

●	All GFMs supplied for I-Line® mounting, easily convertible to unit mount by removing the I-Line brackets

●	Neutral current transformer is supplied for 3-phase 4-wire applications. Refer to instructions for proper installation

●	Zone-selective interlocking capability is standard with upstream Micrologic trip system circuit breakers. The GFM can also be zone interlocked with the GC ground-fault system by using a restraint interface module.See Supplementary Digest

●	120 Vac control power is required for integral test feature. Meets NEC 230-95(c)

Ground-fault modules cannot be reverse fed.

 

Table 3.86:

Module/Enclosure Selection Chart

Companion Circuit Breaker Prefix	Cat. No.	Enclosure Space Required		Ground-fault Pickup Adjustment Range	GFM $ Price
		I-Line Switchboard	Individual Enclosure a
FAL, FHL, FCL, FA, FH, FC	GFM100FA	LA	KA	20–100 A	2833.00
FI	GFM100FI	LA	—	20–100 A	2833.00
KAL, KHL, KI, KA, KH, KC	GFM250	LA	LA	40–200 A	2833.00
FIL	GFM100FI	—	Factory installed only. See Digest page 7-55.	20–100 A	2833.00
KCL, KIL	GFM250	—		40–200 A	2833.00

a	Use NEMA 1 or 3R enclosures only. See page 3-36 for dimensions.

 

 

Ground-Censor® Type GA—600 Vac

The Type GA Ground-Censor equipment ground-fault protection system is recommended for protection of motor branch circuits. The type GA system is not recommended for service entrance applications, see GC200 in Section 7 of the Digest. The GA system requires the following components: GA relay, GA sensor, and circuit interrupter with 120 Vac shunt trip. GA test panel is optional, however sensor selected must be compatible with test panel when one is useda.

Consider substituting GC-200 or Vigirex® ground-fault relays.

Type GA System Features:

●	Ground-fault current pickup adjustable from 4–1200 A, dependent on the sensor used and the connections

●	Time delay field adjustable from instantaneous to 36 cycles

●	Test panel available to meet NEC 230-95. Test with or without tripping. Requires 120 Vac 50/60 Hz power (50 VA min.)

●	120 Vac shunt trip is required on the circuit breaker to interrupt the circuit

●	Relay contacts are rated for 10 A continuous @ 250 Vac UL Listed

 

Table 3.87:

GA Catalog Numbers

Description		Ground-fault Trip Range	Cat. No.	$ Price
Instantaneous relay Time delay relay  (for motor starter applications)		Dependent on sensor and connections	GA12 GAT12	660.00 952.00
Sensor Type GAb	Window Size 3-3/4 in. Dia. 3-3/4 in. Dia. 2-1/2 in. Dia. 7-7/8 in. x 11-1/4 in. 7-7/8 in. x 15-3/4 in. 7-7/8 in. x 24-5/8 in.	4–12, 12–36 A 4–12 A 4–12 A 25–75, 50–150, 150–450, 400–1200 A 50–150, 150–450, 400–1200 A 150–400, 400–1200 A	GA375T GA375a GA250a GA811 GA816 GA825	447.00 407.00 377.00 807.00 917.00 1110.00
Test Panel		Same As Sensor	GA12TPM	1059.00

a	Does not have connections for test panel.

b	Requires 2 inch clearance from current carrying wires on all sides.

 

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