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.

    9456 Products showing for MCBs

    Schneider Electric
    2
    4A
    Type C
    440 V, 12 → 133 V, 220 → 240 V, 380 → 415V
    10 kA
    100 → 133V
    Acti 9
    iC60H
    MCB
    DIN Rail Mount
    85mm
    36mm
    78.5mm
    -
    -
    Yes
    Green Premium
    ABB
    3
    100A
    Type B
    440V
    10 kA
    -
    System Pro M Compact
    S200
    MCB
    DIN Rail Mount
    88mm
    52.5mm
    69mm
    S203-B100
    -
    -
    -
    Schneider Electric
    3
    1A
    Type C
    440 V, 12 → 133 V, 220 → 240 V, 380 → 415V
    10 kA
    100 → 133V
    Acti 9
    iC60H
    MCB
    DIN Rail Mount
    85mm
    54mm
    78.5mm
    -
    -
    Yes
    Green Premium
    ABB
    2
    16A
    Type C
    400V
    6 kA
    -
    -
    S202L
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Schneider Electric
    1
    20A
    Type B
    100 → 133 V, 12 → 60 V, 220 → 240V
    10 kA
    72 V, 12 → 48V
    Acti 9
    iC60H
    MCB
    DIN Rail Mount
    85mm
    18mm
    78.5mm
    A9F53120
    -
    Yes
    Green Premium
    Schneider Electric
    3
    80A
    Type D
    -
    -
    -
    Acti 9
    A9N1
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    Yes
    Green Premium
    Schneider Electric
    1
    8A
    Type C
    415V
    20 kA
    60V
    Multi 9
    C60SP
    Residential MCB
    DIN Rail Mount
    81mm
    18mm
    72mm
    M9F22108
    -
    Yes
    Green Premium
    Schneider Electric
    4
    32A
    Type C
    440 V, 12 → 133 V, 220 → 240 V, 380 → 415V
    10 kA
    220 → 250V
    Acti 9
    iC60H
    MCB
    DIN Rail Mount
    85mm
    72mm
    78.5mm
    iC60H 4P 32A
    -
    Yes
    Green Premium
    ABB
    3
    63A
    Type C
    400V
    10 kA
    440V
    System Pro M Compact
    S200 M UC
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Schneider Electric
    1
    25A
    Type C
    100 → 133 V, 12 → 60 V, 220 → 240V
    10 kA
    72 V, 12 → 48V
    Acti 9
    iC60H
    MCB
    DIN Rail Mount
    85mm
    18mm
    78.5mm
    A9F
    -
    Yes
    Green Premium
    Europa
    2
    4A
    Type C
    230 V, 400V
    10 kA
    -
    EUC2P
    EUC
    MCB
    DIN Rail Mount
    36mm
    78mm
    87mm
    EUC2P4C
    -
    -
    -
    ABB
    3+N
    16A
    Type B
    -
    -
    -
    System Pro M Compact
    S200
    -
    DIN Rail Mount
    -
    -
    -
    S203-B16NA
    Designed for disassembly
    Yes
    -
    ABB
    3
    10A
    Type D
    440V
    6 kA
    12V
    System Pro M Compact
    S200
    MCB
    DIN Rail Mount
    69mm
    52.5mm
    88mm
    S203-D10
    Designed for disassembly
    Yes
    -
    Schneider Electric
    3
    10A
    Type D
    440 V, 12 → 133 V, 220 → 240 V, 380 → 415V
    10 kA
    100 → 133V
    Acti 9
    iC60H
    MCB
    DIN Rail Mount
    85mm
    54mm
    78.5mm
    -
    -
    Yes
    Green Premium
    ABB
    3
    16A
    Type C
    440V
    10 kA
    -
    System Pro M Compact
    S200M
    MCB
    DIN Rail Mount
    88mm
    52.5mm
    69mm
    S203M-C16
    -
    -
    -
    ABB
    3
    20A
    Type C
    400V
    10 kA
    -
    System Pro M Compact
    S200
    MCB
    DIN Rail Mount
    88mm
    52.5mm
    69mm
    S203-C20
    Designed for disassembly
    Yes
    -
    Schneider Electric
    1
    6A
    Type D
    100 → 133 V, 12 → 60 V, 220 → 240V
    10 kA
    72 V, 12 → 48V
    Acti 9
    iC60H
    MCB
    DIN Rail Mount
    85mm
    18mm
    78.5mm
    -
    -
    Yes
    Green Premium
    Schneider Electric
    2
    10A
    Type B
    440 V, 12 → 133 V, 220 → 240 V, 380 → 415V
    10 kA
    100 → 133V
    Acti 9
    iC60H
    MCB
    DIN Rail Mount
    85mm
    36mm
    78.5mm
    -
    -
    Yes
    Green Premium
    ABB
    1
    10A
    Type C
    253V
    6 kA
    72V
    System Pro M Compact
    S200
    MCB
    DIN Rail Mount
    88mm
    17.5mm
    76mm
    S201-C10
    -
    -
    -
    Schneider Electric
    1
    32A
    Type C
    100 → 133 V, 12 → 60 V, 220 → 240V
    6 kA
    12 → 48 V, 72V
    Acti 9
    iC60N
    MCB
    DIN Rail Mount
    18mm
    85mm
    78.5mm
    -
    -
    Yes
    Green Premium
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