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Motor Protection Circuit Breakers

Motor Protection Circuit Breakers (MPCB) provide reliable protection for electric motors against overload, phase failure and short-circuit conditions. Designed for manual motor starting and isolation, these adjustable protection devices are widely used in industrial control panels, machinery installations and motor starter systems.

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Hager | MM501N | Motor Protection Circuit Breaker | 3P 0.1–0.16A

Available to Order
Estimated Lead Time:
Usually 2 - 4 Working Days
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SKU: MM501N
£137.05

Hager | MM508N | Motor Protection Circuit Breaker | 3P 2.5–4A

Available to Order
Estimated Lead Time:
Usually 2 - 4 Working Days
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SKU: MM508N
£106.19

Hager | MM509N | Motor Protection Circuit Breaker | 3P 4–6.3A

Available to Order
Estimated Lead Time:
Usually 2 - 4 Working Days
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SKU: MM509N
£112.55

Hager | MM510N | Motor Protection Circuit Breaker | 3P 6.3–10A

Available to Order
Estimated Lead Time:
Usually 2 - 4 Working Days
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SKU: MM510N
£113.62

Hager | MZ520N | Auxiliary Contact 1NC+1NO for Motor Starter

Available to Order
Estimated Lead Time:
Usually 2 - 4 Working Days
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SKU: MZ520N
£28.08

Hager | MZ527N | Alarm Contact 2CO for Motor Starter

Available to Order
Estimated Lead Time:
Usually 2 - 4 Working Days
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SKU: MZ527N
£21.94

Hager | MZ528N | Under Voltage Release | 230V AC for Motor Starter

Available to Order
Estimated Lead Time:
Usually 2 - 4 Working Days
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SKU: MZ528N
£34.82

Hager | MZ529N | Under Voltage Release 400V AC for Motor Starter

Available to Order
Estimated Lead Time:
Usually 2 - 4 Working Days
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SKU: MZ529N
£31.79

Hager | MZ530N | IP66 | External Emergency Stop Button

Available to Order
Estimated Lead Time:
Usually 2 - 4 Working Days
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SKU: MZ530N
£34.81

Showing all 9 results

Motor Protection Circuit Breakers

Motor protection circuit breakers are specialised protective devices designed to safeguard electric motors from overload, short-circuit and phase loss conditions. Unlike standard miniature circuit breakers, MPCBs are specifically calibrated to match motor characteristics and allow adjustable current settings for accurate protection.

These devices combine several functions in a single compact unit, including motor isolation, manual switching and thermal-magnetic protection. This makes them ideal for motor starter assemblies, control panels and industrial automation systems.

Adjustable Motor Protection

Most motor protection circuit breakers feature adjustable current settings, allowing the protection level to be matched precisely to the rated current of the motor. This ensures reliable operation while preventing nuisance tripping during motor start-up.

Typical Applications

Motor protection circuit breakers are commonly used in:

  • Industrial machinery and manufacturing equipment
  • Pump and compressor systems
  • Conveyor systems
  • HVAC motors and ventilation equipment
  • Control panels and motor starter assemblies

Motor Starter Accessories

Many motor protection switches can be expanded with compatible accessories to create a complete motor control solution. Available accessories may include auxiliary contacts, alarm contacts, undervoltage releases, enclosures and emergency stop devices.

These additions allow the motor protection breaker to be integrated into control circuits, signalling systems and safety installations.

Key Features

  • Adjustable motor current protection
  • Combined overload and short-circuit protection
  • Manual motor starting and isolation
  • Compact DIN-rail installation
  • Compatible accessories for expanded functional