EATON PKZM0-32 Motor Protection Circuit Breaker 32A 3-Pole 15kW 400V Rotary Knob

Protecting motors from overloads and short circuits is critical in industrial environments. The EATON PKZM0-32 Motor Protection Circuit Breaker offers reliable protection for three-phase motors up to 15 kW at 400 V, with an adjustable overload range of 25–32 A. Its compact design and rotary knob actuation make it a practical choice for machine builders and panel builders.

Who is it for

This device is intended for electrical engineers, panel builders, and maintenance technicians who need a dependable motor protection solution for industrial machinery, pumps, fans, and conveyor systems. It is suitable for use in control cabinets and motor control centers where space is limited but performance cannot be compromised.

Main features

• Adjustable thermal overload release from 25 A to 32 A for precise motor protection
• Fixed magnetic short-circuit release at approximately 448 A for rapid fault clearing
• 3-pole switching with screw terminals for secure wiring
• Rotary knob actuation for clear ON/OFF indication and manual reset
• High breaking capacity of 50 kA at 400 V for robust short-circuit protection
• Compact 45 mm width saves space on DIN rail
• Complies with IEC/EN 60947-4-1 and VDE 0660 Part 102 standards

Specifications

• Rated operational current (Ie): 32 A
• Overload release setting range: 25–32 A
• Rated operational power (AC-3, 400 V): 15 kW
• Rated operational voltage (Ue): 690 V AC
• Number of poles: 3
• Actuation type: Rotary knob
• Mounting type: DIN rail / screw mounting
• Rated impulse withstand voltage (Uimp): 6 kV
• Rated short-circuit breaking capacity (Icu) at 400 V: 50 kA
• Degree of protection (front): IP20
• Degree of protection (terminals): IP00
• Terminal type: Screw terminals
• Overload release type: Thermal
• Short-circuit release type: Magnetic
• Short-circuit release fixed setting: 448 A (approx. 14 x Ie)
• Frequency: 50/60 Hz
• Rated insulation voltage (Ui): 690 V
• Ambient operating temperature: -25 to +55 °C

Tips

When setting the overload release, choose a value that matches the motor's full-load current to ensure optimal protection without nuisance tripping. Always verify that the short-circuit breaking capacity of the PKZM0-32 exceeds the prospective fault current at the installation point. For DIN rail mounting, allow adequate space around the device for heat dissipation and accessibility.