Technical Data Bulletin

7-82
© 2020 Schneider Electric
All Rights Reserved
12/2/2020
Ground-Fault Protection Add-On Ground-Fault and Earth-Leakage
Modules
www.se.com/us
Class 931, 940, 960
MicroLogic™ Add-on Ground-Fault Module (GFM)
GFM250 with Optional GFM25CT
The MicroLogic Ground-Fault Module (GFM) is a UL Listed/CSA Certified circuit breaker
accessory which protects equipment from damage caused by ground faults. It is an add-
on module which, when connected to a PowerPact H- or J-frame thermal-magnetic
circuit breaker only, provides ground-fault sensing and ground-fault relay functions.
HD/JD ground-fault modules feature:
•
Adjustable ground-fault pickup levels
•
Adjustable ground-fault time delays
•
Integral ground fault push-to-test feature
•
Ground-fault indicator (mechanical for local, contacts for remote)
•
All GFMs are supplied for I-Line™ mounting as standard, easily convertible to unit
mount by removing the I-Line bracket
•
Fault-powered (through the sensing current transformer) for electronics, shunt trip,
and integral test feature. Meets NEC 230.95(C)
•
A 12 Vdc shunt trip module (Catalog No. S29382) is required in the circuit breaker.
This may be field installed or factory installed when the circuit breaker is ordered with
an -SN suffix.
•
UL 1053 — Ground-fault Sensing and Relaying Equipment
The GFM system requires the following:
•
H-frame (15–150 A) or J-frame (150–250 A) molded case circuit breaker
•
Shunt trip is required for the function of the GFM (may be factory-installed or field-
installed)
•
Bus bar connection (terminal nut inserts) for OFF end of circuit breaker
•
Optional neutral current transformer, catalog number GFM25CT (must be ordered for
4-wire applications). NOTE: Ground-fault modules cannot be used for alarming only.
Table 7.160: Module/Enclosure Selection Chart
[1]
Companion Circuit
Breaker Prefix
Cat. No. [2]
I-Line
Switchboard
Ground-fault Pickup
Adjustment Range
HD, HG, HJ, HL
GFM150HD LA 20–100 A
JD, JG, JJ, JL
GFM250JD LA 40–200 A
Accessories
H & J GFM25CT
Optional Neutral Current Transformer (required for 4-wire loads)
Earth Leakage Module (ELM) for PowerPact H- and J-Frame
MCCBs
I-Line J-Frame with ELM Installed
The Earth Leakage Module (ELM) is an add-on module which, when connected to a
PowerPact H- or J-frame MCCB, provides low-level ground-fault sensing and ground-
fault relay functions.
Because these ELMs are highly sensitive (30 mA to 3 A), they provide much greater
protection than GFMs (20 to 200 A sensitivity). The ELMs provide greater protection of
control circuits and other sensitive equipment. The associated circuit breaker must have
a 48 Vdc shunt trip, which may be field-installed (kit S29392) or factory-installed (suffix –
SP) in the H- or J-Frame circuit breaker.
Add-on Earth Leakage Module (ELM) Features:
•
Adjustable ground-fault pickup levels as low as 30 mA
•
Adjustable ground-fault time delays from instantaneous to 500 msec
(Time delay can be applied to the 30 mA setting)
•
Integral ground fault push-to-test feature
•
Ground-fault indicator; pop-up button for local status and contacts for remote
indication (to be used only with the tripping option)
•
All ELMs are supplied for I-Line™ mounting and are easily convertible to unit-mount
by removing the I-Line brackets
•
Three poles; 240 to 600 Vac maximum: 3-wire applications only (no neutral)
•
Line-power obtained through internal bus to provide power for electronics, shunt trip,
and integral test feature.
•
A shunt trip is required in the circuit breaker; it may be field-installed or factory-
installed in the PowerPact H and J circuit breakers.
•
UL 1053 – Ground-fault Sensing and Relaying Equipment
Table 7.161: ELM Selection Chart
[3]
Companion Circuit Breaker [4] Enclosure Space
Required I-Line
Switchboard
Pick-Up Adjustment
Range
Catalog Number
Prefix Size
HD, HG, HJ, HL
15–150 A LA 30 mA–3 A ELM150HD
JD, JG, JJ, JL
150–250 A LA 30 mA–3 A ELM250JD
7
MINIATURE AND MOLDED CASE
CIRCUIT BREAKERS
[1] At 250 A, the GFM250JD can be used with 80% rated circuit breakers only.
[2] See Supplemental Digest Section 3 for additional GFMs.
[3] At 250 A, the ELM250JD can be used with 80% rated circuit breakers only.
[4] For Factory Installation of ELM Module: For termination designation (3rd letter of catalog number) use ONLY “M”. Add factory installed 48 Vdc shunt trip (suffix SP) to breaker plus suffix VL
or VM.