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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.

    9003 產品顯示為 MCBs

    Better World
    HK$1,343.30
    Schneider Electric
    2
    13A
    Type C
    -
    C60H-DC
    20 kA
    500V
    Acti 9
    20 kA
    DIN Rail Mount
    MCB
    -
    73mm
    81mm
    -
    -
    Yes
    Green Premium
    HK$724.40
    Schneider Electric
    2
    10A
    Type C
    440V
    iC60H
    10 kA
    133V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    -
    78.5mm
    91mm
    -
    -
    Yes
    Green Premium
    Better World
    HK$949.34
    Schneider Electric
    -
    63A
    Type B
    230 V, 400V
    iC60H
    10 kA
    72V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    36mm
    78.5mm
    91mm
    -
    -
    Yes
    Green Premium
    HK$6,676.70
    Schneider Electric
    4
    3A
    Type C
    440V
    iC60H
    10 kA
    250V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    72mm
    -
    85mm
    -
    -
    Yes
    Green Premium
    HK$1,511.40
    Schneider Electric
    4
    25A
    Type C
    440V
    iC60H
    10 kA
    250V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    -
    78.5mm
    91mm
    -
    -
    Yes
    Green Premium
    HK$497.80
    Schneider Electric
    1
    50A
    Type C
    230 V, 400V
    iC60H
    10 kA
    72V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    18mm
    78.5mm
    91mm
    -
    -
    Yes
    Green Premium
    Better World
    HK$377.38
    Schneider Electric
    1
    3A
    Type C
    230 V, 400V
    iC60H
    10 kA
    72V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    18mm
    78.5mm
    91mm
    -
    -
    Yes
    Green Premium
    HK$305.50
    Schneider Electric
    1
    10A
    Type C
    230 V, 400V
    iC60H
    10 kA
    72V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    18mm
    78.5mm
    91mm
    -
    -
    Yes
    Green Premium
    HK$3,452.30
    Schneider Electric
    3
    4A
    Type C
    440V
    iC60H
    10 kA
    180V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    54mm
    -
    85mm
    -
    -
    Yes
    Green Premium
    HK$2,526.51
    Schneider Electric
    3
    63A
    Type C
    440V
    iC60H
    10 kA
    133V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    -
    78.5mm
    91mm
    -
    -
    Yes
    Green Premium
    HK$8,648.28
    Schneider Electric
    3
    125A
    Type D
    440V
    C120N
    10 kA, 20 kA
    375V
    Acti 9
    10 kA, 20 kA
    DIN Rail Mount
    MCB
    -
    73mm
    81mm
    -
    -
    Yes
    Green Premium
    HK$10,422.97
    Schneider Electric
    4
    125A
    Type C
    440V
    C120H
    15 kA, 30 kA
    500V
    Acti 9
    15 kA, 30 kA
    DIN Rail Mount
    MCB
    108mm
    -
    81mm
    -
    -
    Yes
    Green Premium
    Better World
    HK$893.44
    Schneider Electric
    1
    50A
    Type C
    -
    C60H-DC
    20 kA
    250V
    Acti 9
    20 kA
    DIN Rail Mount
    MCB
    18mm
    73mm
    81mm
    -
    -
    Yes
    Green Premium
    HK$4,204.59
    Schneider Electric
    4
    50A
    Type C
    440V
    iC60H
    10 kA
    250V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    -
    -
    85mm
    -
    -
    Yes
    Green Premium
    HK$2,054.22
    Schneider Electric
    3
    40A
    Type C
    440V
    iC60N
    6 kA
    180V
    Acti 9
    6 kA
    DIN Rail Mount
    MCB
    -
    -
    85mm
    -
    -
    Yes
    Green Premium
    Better World
    HK$802.72
    Schneider Electric
    1
    40A
    Type C
    -
    C60H-DC
    20 kA
    250V
    Acti 9
    20 kA
    DIN Rail Mount
    MCB
    -
    -
    81mm
    -
    -
    Yes
    Green Premium
    HK$2,736.44
    Schneider Electric
    4
    2A
    Type D
    12 → 133 V, 220 → 240 V, 380 → 415 V, 440V
    iC60H
    10 kA
    220 → 250V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    72mm
    -
    78.5mm
    -
    -
    Yes
    Green Premium
    HK$666.40
    Schneider Electric
    2
    40A
    Type C
    440 V, 12 → 133 V, 220 → 240 V, 380 → 415V
    iC60H
    10 kA
    100 → 133V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    85mm
    36mm
    78.5mm
    -
    -
    Yes
    Green Premium
    HK$1,611.21
    Schneider Electric
    3
    20A
    Type B
    440V
    iC60N
    6 kA
    180V
    Acti 9
    6 kA
    DIN Rail Mount
    MCB
    54mm
    -
    85mm
    -
    -
    Yes
    Green Premium
    Better World
    HK$1,472.47
    Schneider Electric
    2
    4A
    Type C
    -
    C60H-DC
    20 kA
    500V
    Acti 9
    20 kA
    DIN Rail Mount
    MCB
    36mm
    -
    81mm
    -
    -
    Yes
    Green Premium
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