EATON PKZM0-20 Motor Protection Circuit Breaker, 3-Pole, 16-20 A, 9 kW at 400 V, Rotary Knob

Motor protection circuit breaker with thermal-magnetic trip unit, rated up to 20 A and 9 kW at 400 V AC. The PKZM0-20 safeguards three-phase motors against overload and short circuit, with a rotary knob for manual operation and a wide setting range of 16–20 A. Its compact 45 mm width and screw terminals enable fast DIN rail installation in industrial control panels.

Advantages

Precise overload adjustment from 16 to 20 A ensures optimal motor protection without nuisance tripping. High short-circuit breaking capacity of 50 kA at 400 V enhances system safety. Front protection degree IP65 when mounted in an enclosure allows use in demanding environments. Screw terminals provide secure, vibration-resistant connections.

Suitable for

• Three-phase asynchronous motors up to 9 kW at 400 V
• Machine tools, pumps, fans, and conveyor systems
• Industrial control panels and motor control centers
• Applications requiring manual motor starting and protection

Key specifications

• Rated operational current: 20 A (adjustable 16–20 A)
• Rated operational power: 9 kW at 400 V AC-3
• 3-pole, thermal-magnetic trip characteristic
• Short-circuit breaking capacity Icu: 50 kA at 400 V
• Rated operational voltage: 690 V AC max
• Rotary knob actuator, DIN rail mounting
• Degree of protection: IP20 terminals, IP65 front with enclosure
• Ambient temperature: -25 to +55 °C
• Standards: IEC/EN 60947-4-1, VDE 0660 Part 102

Recommendations

For reliable motor protection in industrial environments, pair the PKZM0-20 with a suitable contactor and overload relay to build a complete motor starter. Always verify the motor's full-load current and set the overload release within the 16–20 A range for optimal protection.