Square D GFM250Z3 Ground Fault Module

The Square D GFM250Z3 Ground Fault Module is an add‑on ground‑fault protection accessory for Square D MicroLogic circuit breakers, designed to monitor for earth faults and trip the associated breaker to guard connected equipment in 600 V distribution systems. This model is identified as a 250 A, 600 V ground fault module (GFM250Z3), a variant within the GFM250 family; Schneider Electric documentation for the GFM250 family generally lists a 40–200 A operating range, while listings for the Z3 variant commonly describe it as a 250 A unit. The unit shown is noted as missing its lug cover, a condition often encountered in secondary market listings. The GFM250 family modules are UL/CSA listed and are designed to work with MicroLogic trip units on PowerPact H- and J-frame breakers to provide Ground-Fault Protection of Equipment (GFPE) in industrial and commercial panels, making them suitable for protecting feeders, switchgear, and other heavy‑distribution equipment in 600 V systems.