The Square D GC200D is a ground fault relay designed for circuit breaker integration, providing earth-leakage monitoring with a 5 A/10 A trip/alarm output.
The 5 A/10 A trip/alarm output defines the relay's switching capacity: the 5 A rating is the continuous carry current through the trip circuit, while the 10 A rating applies to the alarm circuit under specified conditions. This split lets the relay signal a fault condition independently of the main trip path. Earth-leakage sensitivity covers a wide range from 30 A to 300 A, with intermediate steps at 90 A, 120 A, 150 A, 180 A, 210 A, 240 A, and 270 A. This adjustable threshold allows the relay to be tuned to the specific ground-fault level of the protected circuit — critical for coordinating with downstream devices and avoiding nuisance trips. Rated operational voltage of 120 V AC or 24 V DC gives flexibility for control circuits in both line-voltage and low-voltage DC panels. The dual-voltage coil means the same relay can be wired into a standard 120 V control transformer or a 24 V DC PLC output without a separate power supply module.
Panel Integration
DIN rail mounting simplifies installation into existing panel layouts — clips onto the rail without screws, and the relay's footprint occupies a single module width. For a ground-fault relay that may be added as a retrofit to an existing breaker panel, this form factor minimizes enclosure space impact.