EATON PKZM0-2,5 Motor Protection Circuit Breaker 3-Pole 1.6-2.5A 0.75kW 400V

Overloads and short circuits can destroy motors in seconds, leading to costly downtime and repairs. The EATON PKZM0-2,5 motor protection circuit breaker provides reliable thermal-magnetic protection for three-phase motors up to 0.75 kW at 400 V, with an adjustable current range of 1.6 to 2.5 A. Its rotary knob actuation and compact design make it ideal for machine builders and panel builders who need dependable protection without sacrificing space.

Who is it for

This device is intended for electrical engineers, panel builders, and maintenance technicians working with small three-phase motors in industrial control systems, pumps, fans, and conveyor applications. It suits installations where DIN rail mounting and screw terminals are standard, and where compliance with IEC/EN 60947-4-1 is required.

Main features

• Thermal-magnetic tripping characteristic for overload and short-circuit protection.
• Adjustable current setting from 1.6 A to 2.5 A to match motor full-load current.
• Three-pole switching for all-phase isolation.
• Rotary knob actuation (Knebelbetätigung) for clear ON/OFF indication and manual reset.
• High short-circuit breaking capacity of 50 kA at 400 V AC.
• Compact 45 mm width saves space on DIN rail.
• Degree of protection IP20, suitable for use in enclosed panels.
• Wide ambient temperature range from -25 °C to +55 °C.

Specifications

• Series: PKZM0
• Rated operational voltage (Ue): 690 V AC
• Rated insulation voltage (Ui): 690 V
• Rated impulse withstand voltage (Uimp): 6 kV
• Rated operational power at AC-3, 400 V: 0.75 kW
• Magnetic short-circuit release setting: approx. 32.5 A (13 x Ie max)
• Connection type: Screw terminals
• Mounting: DIN rail or screw fixing
• Standard compliance: IEC/EN 60947-4-1
• Number of poles: 3

Tips

Set the current adjustment dial to the motor's rated full-load current as indicated on its nameplate. For motors with high inrush currents, ensure the magnetic release threshold is not exceeded during starting. Always install inside an enclosure that provides at least IP20 protection. Verify that the short-circuit breaking capacity of the breaker exceeds the prospective fault current at the installation point.