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.
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