Key Parameters Category Description / Value Product Line Eaton PKZM Series / Frame Size PKZM4 Rated Current (Iᵼ) 50 A (This is the frame size or the maximum setting current for the release). Rated Operational Current (Iₑ) - Setting Range Adjustable from 25 A to 50 A via a rotary dial. This allows it to be set to the full-load current of the specific motor being protected. Poles 3-Pole Rated Operational Voltage (Uₑ) 690 V AC, 50/60 Hz Rated Insulation Voltage (Uᵢ) 690 V AC Utilization Categories AC-3: Squirrel-cage motors (starting, switching off during running) AC-1: Non-inductive or slightly inductive loads Short-Circuit Protection Magnetic Trip (Instantaneous) • Setting: Typically fixed or adjustable depending on the model variant. For a standard PKZM4-50, the magnetic trip value is often fixed at 14 x Iₑ (e.g., 700A at the 50A setting). Always check the datasheet for the specific variant. Overload Protection Thermal Trip (Inverse Time) • Setting: Adjustable from 25 A to 50 A. • Trip Class: Class 10 (fast tripping characteristic, suitable for standard motor starting). Rated Service Short-Circuit Breaking Capacity (Ics) Typically 50 kA at 400V AC (according to IEC 60947-2). Rated Ultimate Short-Circuit Breaking Capacity (Icu) Typically 50 kA at 400V AC (according to IEC 60947-2). Control Circuit Function Manual ON/OFF switching with a toggle handle. Can be padlocked in the OFF position for safety (lock-out tag-out). Standards Compliance IEC/EN 60947-2 (Circuit-breakers) IEC/EN 60947-4-1 (Contactors and Motor-Starters) Connection Screw terminals. Auxiliary Contacts Available as an add-on module (e.g., PKZM0-XAU, PKZM0-XS1) that can be easily snapped onto the side of the breaker to provide signaling (e.g., trip indication). Compatible Contactors Designed for coordination with Eaton DIL series contactors (e.g., DILM) to form a coordinated motor starter combination.