Square D PowerPact family is industry leading innovation and protection for heavy duty commercial and industrial appliacations 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-frame thermal-magnetic circuit breaker only, provides ground-fault sensing and ground-fault relay functions. This ground fault module with pick-up adjustment range of 20A to 100A is used with companion PowerPact H-frame breakers with current rating of 15A to 150A. A 12 Vdc shunt trip module is required in the circuit breaker. This may be field installed or factory installed when the circuit breaker is ordered with an -SN suffix. At 250 A, the ELM250JD can be used with 80% rated circuit breakers only. All GFMs are supplied for I-Line mounting as standard, easily convertible to unit mount by removing the I-Line bracket. The product comes as UL 1053 Ground-fault Sensing and Relaying Equipment. Meets NEC 230.95 QO load centers are designed for residential and industrial use to protect electrical systems, equipment and people.