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    Next Day Delivery Cut Off Time 3PM

    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.

    Showing all 9 results

    Hager MM508N Motor Protection Circuit Breaker

    Hager | MM501N | Motor Protection Circuit Breaker | 3P 0.1–0.16A
    Delivery usually within 3 - 4 working days*
    SKU: MM501N
    £137.05
    Hager MM508N Motor Protection Circuit Breaker

    Hager | MM508N | Motor Protection Circuit Breaker | 3P 2.5–4A
    Delivery usually within 3 - 4 working days*
    SKU: MM508N
    £106.19
    Hager MM509N Motor Protection Circuit Breaker

    Hager | MM509N | Motor Protection Circuit Breaker | 3P 4–6.3A
    Delivery usually within 3 - 4 working days*
    SKU: MM509N
    £112.55
    Hager MM510N Motor Protection Circuit Breaker

    Hager | MM510N | Motor Protection Circuit Breaker | 3P 6.3–10A
    Delivery usually within 3 - 4 working days*
    SKU: MM510N
    £113.62
    Hager MZ520N Auxiliary Contact

    Hager | MZ520N | Auxiliary Contact 1NC+1NO for Motor Starter
    Delivery usually within 3 - 4 working days*
    SKU: MZ520N
    £28.08
    Hager MZ527N Alarm Contact

    Hager | MZ527N | Alarm Contact 2CO for Motor Starter
    Delivery usually within 3 - 4 working days*
    SKU: MZ527N
    £21.94
    Hager MZ528N Under Voltage Release

    Hager | MZ528N | Under Voltage Release | 230V AC for Motor Starter
    Delivery usually within 3 - 4 working days*
    SKU: MZ528N
    £34.82
    Hager MZ529N Under Voltage Release

    Hager | MZ529N | Under Voltage Release 400V AC for Motor Starter
    Delivery usually within 3 - 4 working days*
    SKU: MZ529N
    £31.79
    Hager MZ530N Emergency Stop Button

    Hager | MZ530N | IP66 | External Emergency Stop Button
    Delivery usually within 3 - 4 working days*
    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





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    To ensure your order qualifies for next day delivery, please place your order by 3:00 PM. This is subject to all items being available on the shelf at the time of your order. For orders where the total value exceeds £200 + VAT (double our standard carriage-paid order value of £100 + VAT), we are happy to split the delivery into two shipments if some items are needed urgently and others are not immediately available. If you have any questions or need further assistance, feel free to reach out to us via WhatsApp for live support. We’re here to help!

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