Square D PowerPact family is industry leading innovation and protection for heavy duty commercial and industrial appliacations 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. The associated PowerPact J-frame circuit breaker must have a 48 Vdc shunt trip,either field-installed (kit S29392) or factory-installed (suffix –SP) for J-Frame circuit breaker. This earth leakege module with pick-up adjustment range of 30ma to 3A is used with companion PowerPact J breakers with currect rating of 150A to 250A. At 250 A, the ELM250JD can be used with 80% rated circuit breakers only. ELMs are supplied for I-Line™ mounting and are easily convertible to unit-mount by removing the I-Line brackets. Tthe product comes as UL 1053 – Ground-fault Sensing and Relaying Equipment