PKZM4-58 Eaton Motor Protective Circuit Breaker

The PKZM4-58 is a motor protective circuit breaker with screw terminal connection. It delivers thermal and magnetic protection for motors, with an adjustable overload release setting spanning 50–58A. Its short-circuit withstand rating is 50kA at 600V. The device incorporates a high-capacity magnetic short-circuit release set at 812A. It is designed for coordination with backup fuses or circuit breakers rated up to 600A that provide current limiting capability. This coordination supports safe operation in industrial applications subject to high fault currents.