EATON PKZM0-25 Motor Protection Circuit Breaker, 3-Pole, 20-25 A, 12.5 kW at 400V, Rotary Knob

Motor failures from overload or short circuits can halt production and cause costly damage. The EATON PKZM0-25 motor protection circuit breaker prevents such downtime by reliably disconnecting three-phase motors up to 12.5 kW at 400 V when currents exceed safe levels. Its adjustable thermal release (20–25 A) and fixed magnetic trip ensure precise protection for a wide range of motor ratings.

Who is it for

This compact MPCB is ideal for panel builders, maintenance technicians, and machine OEMs who need dependable motor protection in industrial control cabinets. It suits pumps, fans, conveyors, compressors, and other three-phase loads where space is limited but performance cannot be compromised.

Main features

• Adjustable overload release from 20 A to 25 A for flexible motor matching
• Fixed instantaneous magnetic trip for fast short-circuit interruption
• High breaking capacity of 50 kA at 400 V AC
• Rotary knob actuation with clear ON/OFF and trip indication
• DIN rail or screw mounting for easy installation
• IP20 terminals (IP65 front with optional enclosure)
• Complies with IEC/EN 60947-4-1 and VDE 0660

Specifications

• Rated operational current (Ie): 25 A
• Overload setting range: 20–25 A
• Rated operational voltage (Ue): 690 V AC
• Rated insulation voltage (Ui): 690 V
• Rated impulse withstand voltage (Uimp): 6 kV
• Rated operational power at 400 V AC-3: 12.5 kW
• Number of poles: 3
• Ambient operating temperature: -25 °C to +55 °C
• Terminal type: screw terminals
• Degree of protection: IP20 (terminals), IP65 (front with enclosure)
• Mounting: 35 mm DIN rail or screw fixing
• Standards: IEC/EN 60947-4-1, VDE 0660

Tips

Always set the thermal release to the motor's full-load current as indicated on its nameplate. For frequent starts or high ambient temperatures, consider derating the breaker or improving cabinet ventilation. Auxiliary contacts can be added for remote status indication or control interlocking.