EATON PKZM0-6.3 Motor Protection Circuit Breaker, 3-Pole, 4-6.3 A, 2.2 kW, Rotary Knob

Motor failures caused by overloads or short circuits can bring production to a halt and lead to costly repairs. The EATON PKZM0-6.3 motor protection circuit breaker is built to prevent exactly that. With a thermal-magnetic trip mechanism, it reliably disconnects the motor in the event of an overload or short circuit, while its phase failure sensitivity protects against dangerous single-phasing conditions. This 3-pole breaker is rated for a continuous current of 6.3 A and is suitable for motors up to 2.2 kW at 400 V AC.

Who is it for

This device is intended for electrical engineers, panel builders, and maintenance technicians who need dependable motor protection in industrial control panels, machine tools, pumps, fans, and conveyor systems. It is ideal for DIN rail mounting in distribution boards or enclosed starters.

Main features

• Adjustable overload release from 4 A to 6.3 A for precise motor matching
• Fixed short-circuit release at 98 A for rapid fault clearing
• Phase failure sensitivity protects against motor burnout from single-phasing
• Rotary knob actuation with clear ON/OFF and trip indication
• High breaking capacity of 50 kA at 400 V for robust short-circuit protection
• Compact 45 mm width saves space in control panels
• Complies with IEC/EN 60947-4-1 for motor protection equipment

Specifications

• Rated operational current (Ie): 6.3 A
• Setting range, overload release: 4 - 6.3 A
• Rated operational power: 2.2 kW at 400 V AC
• Rated operational voltage (Ue): 400 V AC
• Number of poles: 3
• Actuation type: Rotary knob
• Mounting type: DIN rail (35 mm) / screw mounting
• Degree of protection: IP20 (terminals), IP65 (with enclosure)
• Terminal type: Screw terminals
• Rated impulse withstand voltage (Uimp): 6 kV
• Rated insulation voltage (Ui): 690 V
• Rated short-circuit breaking capacity (Icu): 50 kA at 400 V
• Tripping characteristic: Thermal-magnetic
• Phase failure sensitivity: Yes
• Standard compliance: IEC/EN 60947-4-1
• Operating temperature range: -25 to +55 °C

Tips

To ensure optimal protection, set the overload release to the motor's full-load current as indicated on its nameplate. The phase failure sensitivity is always active, so no additional wiring is needed. For installations in dusty or wet environments, mount the breaker in an enclosure with at least IP65 protection.