MCBs | Miniature Circuit Breakers | RS
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    MCBs

    MCBs, or Miniature Circuit Breakers, are electrical devices designed to protect an electrical circuit from damage caused by overcurrent. They serve as a crucial component in the electrical distribution system of buildings, homes, and industrial facilities. You can learn more in our MCB guide.

    RS offer a comprehensive selection of high-quality Miniature Circuit Breakers from industry-leading brands including ABB, Siemens, Schneider Electric, Eaton, Rockwell Automation and Lovato.

    How does a miniature circuit breaker work?

    MCBs automatically disconnect the electrical circuit when they detect a current exceeding the rated capacity of the circuit. This action helps prevent overheating and potential damage to the wiring, appliances, or other connected devices.

    What are the different types of circuit breakers?

    MCBs come in different types, including Type B, C, and D, each designed to trip at different levels of overcurrent. The choice of MCB type depends on the specific characteristics of the electrical load it is protecting.

    • Type B: General purpose, suitable for domestic installations. Trips between 3 and 5 times the load current.
    • Type C: Designed for applications with higher inrush currents, such as motors and transformers. Trips between 5 and 10 times the full load current.
    • Type D: Intended for circuits with significant inrush currents, like those associated with high-powered equipment. Trips between 10 and 20 times the full load current.

    What is the tripping mechanism of an MCB?

    MCBs typically use thermal and magnetic tripping mechanisms. The thermal component responds to prolonged overcurrent conditions, while the magnetic component reacts to short-circuit currents.

    Where are MCBs installed?

    MCBs are installed in distribution boards or consumer units and are often used in conjunction with residual current devices (RCDs) for enhanced electrical safety.

    Can I reset an MCB?

    After tripping due to overcurrent, MCBs can usually be reset manually. However, it is crucial to investigate and address the cause of the overcurrent before resetting to avoid potential hazards.

    MCBs play a vital role in electrical safety by preventing electrical fires and protecting equipment from damage caused by excessive current. They are an integral part of modern electrical installations, contributing to the overall reliability and safety of electrical systems.

    8391 표시되는 제품 MCBs

    Siemens
    3+N
    4A
    Type C
    400V
    5SY7
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SY7604-7
    Extended product life
    Yes
    -
    ABB
    3
    25A
    Type Z
    240V
    S800U
    50 kA
    -
    -
    50 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Eaton
    1
    20A
    Type B
    240V
    FAZ
    15 kA
    60V
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    ABB
    2
    30A
    Type Z
    240V
    S800U
    50 kA
    -
    -
    50 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    ABB
    1
    2A
    Type Z
    230V
    S200 M UC
    10 kA
    220V
    System Pro M Compact
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Schneider Electric
    3
    125A
    Type C
    440V
    C120N
    10 kA, 20 kA
    375V
    Acti 9
    10 kA, 20 kA
    DIN Rail Mount
    MCB
    -
    -
    81mm
    -
    -
    Yes
    Green Premium
    Schneider Electric
    1
    4A
    Type D
    415V
    C60SP
    20 kA
    60V
    Multi 9
    20 kA
    DIN Rail Mount
    Residential MCB
    81mm
    18mm
    72mm
    M9F23104
    -
    Yes
    Green Premium
    Siemens
    3
    20A
    Type B
    400V
    5SL4
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    54mm
    76mm
    5SL4320-6
    Extended product life
    Yes
    -
    Eaton
    1
    125A
    Type B
    230V
    -
    15 kA
    -
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Siemens
    2
    63A
    Type E
    -
    5SP3263
    -
    -
    SENTRON
    -
    DIN Rail Mount
    -
    -
    -
    -
    5SP3263-3
    -
    -
    -
    ABB
    1
    1A
    Type Z
    277V
    SU200 M
    15 kA
    48V
    -
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
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