Key Technical Parameters Parameter Description / Value Product Line Eaton PKZM (Motor Protection Circuit Breakers) Series / Frame Size PKZM 4 Rated Current (Iᵤ) 50 A (Frame Size) Setting Range for Rated Operational Current (Iₑ) Adjustable from 25 A to 50 A via a rotary dial. Poles 3 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 (e.g., heaters) Overload Protection (Thermal Trip) • Trip Class: Class 10 (Standard motor starting) • Setting: Continuously adjustable from 25 A to 50 A. Short-Circuit Protection (Magnetic Trip) • Setting: Fixed at 14 x Iₑ (e.g., 700 A at the 50 A setting). Rated Service Short-Circuit Breaking Capacity (Ics) 50 kA at 400 V AC (IEC 60947-2) Rated Ultimate Short-Circuit Breaking Capacity (Icu) 50 kA at 400 V AC (IEC 60947-2) Control & Operation Manual ON/OFF switching via toggle handle. Can be padlocked in the OFF position. Standards Compliance IEC/EN 60947-2 (Circuit-breakers) IEC/EN 60947-4-1 (Contactors and Motor-Starters) Terminal Connection Screw terminals. Auxiliary Contacts Available as snap-on modules (e.g., PKZM0-XAU, PKZM0-XS1) for signaling (e.g., trip indication). Compatible Contactors Designed for coordinated use with Eaton DIL series contactors (e.g., DILM) to form a complete "Type 2" coordinated motor starter assembly.
