Eaton PKZM4-40 Motor Protection Circuit Breaker 3-Pole 25-40A 690V 222354

With a short-circuit breaking capacity of 50 kA at 400 V, the Eaton PKZM4-40 motor protection circuit breaker delivers reliable protection for motors up to 40 A. This 3-pole device combines thermal overload and magnetic short-circuit protection in a compact DIN rail mountable unit.

Overview

The Eaton PKZM4-40 is a motor protection circuit breaker designed to safeguard motors against overload and short-circuit conditions. It features an adjustable thermal overload release from 25 A to 40 A and a fixed magnetic trip at 14 times the rated current, ensuring precise protection. The breaker is suitable for use in motor control centers, industrial machinery, and other applications requiring robust motor protection.

What stands out

• High short-circuit breaking capacity of 50 kA at 400 V
• Adjustable thermal overload release (25–40 A) for flexible motor protection
• Fixed magnetic trip at 14 x Iu for rapid short-circuit response
• 3-pole design for three-phase motor circuits
• DIN rail or screw mounting for easy installation

Technical details

• Number of poles: 3
• Rated current range: 25–40 A (adjustable overload release)
• Rated operational voltage: up to 690 V AC
• Rated insulation voltage: 690 V
• Rated impulse withstand voltage: 6 kV
• Short-circuit breaking capacity (Icu) at 400 V: 50 kA
• Tripping characteristic: thermal-magnetic
• Magnetic trip setting: fixed 14 x Iu
• Mounting type: DIN rail (35 mm) / screw mounting
• Connection type: screw terminals
• Protection degree: IP20 (terminals), IP00 (housing)
• Rated frequency: 50/60 Hz
• Operating temperature range: -25 to +55 °C
• Standard compliance: IEC/EN 60947-2, IEC/EN 60947-4-1
• Switching capacity category: AC-3 (motor operation)

Our verdict

The Eaton PKZM4-40 is a robust and reliable motor protection circuit breaker, ideal for industrial applications requiring high breaking capacity and precise adjustable overload protection.