EATON PKZM0-1 Motor Protection Circuit Breaker, 0.63-1A, 3-Pole, 0.25kW at 400V, Rotary Knob, Screw Terminals

In a busy control panel, a motor protection circuit breaker must reliably guard against overloads and short circuits. The EATON PKZM0-1 (model 072734) is a 3-pole motor protection circuit breaker with a thermal overload release adjustable from 0.63 to 1 A and a fixed magnetic short-circuit trip. It is rated for motors up to 0.25 kW at 400 V AC-3 and features a rotary knob for manual operation. Screw terminals ensure secure wiring, and the compact 45 mm width fits standard DIN rails. With a high short-circuit breaking capacity of 100 kA at 400 V, it provides robust protection for industrial motor circuits.

Key specifications

• Rated operational current: 1 A (adjustable overload 0.63–1 A)
• Rated operational power: 0.25 kW at 400 V AC-3
• Number of poles: 3
• Rated operational voltage: 690 V AC
• Short-circuit breaking capacity: 100 kA at 400 V, 150 kA at 230 V
• Actuation: rotary knob
• Connection: screw terminals
• Mounting: DIN rail
• Degree of protection: IP20 (terminals), IP00 (main circuit)
• Standards: IEC/EN 60947, VDE 0660

Why choose it

The PKZM0-1 offers precise motor protection with a wide setting range and high breaking capacity. Its compact design and screw terminals simplify installation, while the rotary knob allows clear manual control. It meets international standards and is suitable for ambient temperatures from -25 to +55 °C.

Ideal use cases

• Protection of small three-phase motors in industrial machinery
• Control panels requiring reliable overload and short-circuit protection
• Applications needing a compact DIN-rail mounted breaker with adjustable thermal trip

Good to know

The breaker does not include auxiliary contacts, but add-on modules are available for signaling or remote tripping. It operates at 50/60 Hz and complies with trip class 10. Always verify the motor full-load current and set the thermal release accordingly.