Key Parameters Category Description / Value Product Line Eaton NZM4 Model / Frame Size NZM4-XKM2 Release Type Electronic Trip Unit (as indicated by "S") - Adjustable protection settings. Rated Current (Iₙ) 1250 A (This is the frame rating. The operational current can be set within a range on the electronic trip unit). Poles 3-Pole & 4-Pole versions are available. Rated Operational Voltage (Uₑ) Up to 690 V AC, 50/60 Hz Rated Insulation Voltage (Uᵢ) 1000 V Rated Ultimate Short-Circuit Breaking Capacity (Iᶜᵘ) Very high, typically 100 kA or more at 400V AC (IEC 60947-2). The exact value must be verified from the technical data sheet. Trip Unit Functions • Long-time Delay (L) • Short-time Delay (S) • Instantaneous (I) • Ground-fault (G) protection (depending on the specific "S" variant). Mounting Fixed Mounting (for bolted installation in panels) or Draw-out Version (available as an option). Connection Primary power connections are typically made via busbars. Standards Compliance IEC/EN 60947-2 Auxiliary Contacts & Accessories Compatible with the full range of NZM4 accessories, such as auxiliary contacts, undervoltage release, shunt trip, and motor operator.