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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
    • RS庫存編號 212-1625
    • 製造零件編號 2CDS252280R0164
    HK$373.80
    ABB
    2
    16A
    Type C
    415V
    S200C
    6 kA
    -
    -
    6 kA
    DIN Rail Mount
    MCB
    70mm
    18mm
    70mm
    S202C-C16
    Designed for disassembly
    Yes
    -
    HK$2,030.93
    ABB
    2
    3A
    Type D
    400V
    S200M
    15 kA
    125V
    System Pro M Compact
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$8,045.66
    Schneider Electric
    4
    50A
    Type B
    440V
    A9F
    30 kA
    250V
    Acti9
    30 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 847-3342
    • 製造零件編號 102173 FAZ-C30/2-NA
    HK$840.20
    Eaton
    2
    30A
    Type C
    240 → 415V
    -
    10 kA
    -
    xEffect
    10 kA
    DIN Rail Mount
    MCB
    35.4mm
    105mm
    76mm
    -
    -
    -
    -
    HK$5,813.34
    Schneider Electric
    3
    50A
    Type B
    440V
    A9F
    70 kA
    180V
    Acti9
    70 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 535-4352
    • 製造零件編號 2CDS273001R0634 S203M-C63
    HK$1,001.30
    ABB
    3
    63A
    Type C
    440V
    S200M
    10 kA
    125V
    System Pro M Compact
    10 kA
    DIN Rail Mount
    MCB
    -
    52.5mm
    76mm
    S203M-C63
    -
    -
    -
    • RS庫存編號 230-1094
    • 製造零件編號 264695 PLG6-C16/1N
    HK$135.50
    Eaton
    1+N
    16A
    Type C
    230V
    -
    6 kA
    -
    xPole
    6 kA
    DIN Rail Mount
    MCB
    86mm
    17.5mm
    73mm
    PLG6-C16/1N
    -
    -
    -
    HK$141.70
    Legrand
    1
    20A
    Type C
    250V
    DNX3
    4.5 kA
    12V
    DX Range
    4.5 kA
    DIN Rail Mount
    MCB
    -
    -
    95mm
    -
    -
    -
    -
    • RS庫存編號 849-6493
    • 製造零件編號 EUC1P1C
    HK$76.40
    Europa
    1
    1A
    Type C
    230 V, 400V
    EUC
    10 kA
    -
    EUC1P
    10 kA
    DIN Rail Mount
    MCB
    18mm
    78mm
    87mm
    EUC1P1C
    -
    -
    -
    • RS庫存編號 246-2536
    • 製造零件編號 2CCS571103R8324
    HK$905.20
    ABB
    2
    32A
    Type C
    415V
    -
    -
    -
    SMISSLINE TP
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    HK$752.83
    Schneider Electric
    -
    10A
    Type C
    100 → 130 V, 12 → 60 V, 220 → 240 V, 230V
    iC60N
    6 kA
    -
    Acti 9
    6 kA
    DIN Rail Mount
    MCB
    -
    36mm
    -
    -
    -
    Yes
    Green Premium
    HK$995.30
    Schneider Electric
    2
    1A
    Type C
    100 → 130 V, 12 → 60 V, 220 → 240 V, 380 → 415 V, 400 V, 440V
    iC60N
    6 kA
    12 → 144V
    Acti 9
    6 kA
    DIN Rail Mount
    MCB
    -
    -
    -
    -
    -
    Yes
    Green Premium
    Better World
    • RS庫存編號 219-9121
    • 製造零件編號 M9F22202
    HK$1,216.60
    Schneider Electric
    2
    2A
    Type C
    -
    -
    10 kA
    -
    Multi 9
    10 kA
    DIN Rail Mount
    MCB
    81mm
    36mm
    72mm
    C60SP
    -
    Yes
    Green Premium
    HK$2,002.91
    Schneider Electric
    1
    16A
    Type B
    230V
    A9F
    15 kA
    72V
    Acti9
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 246-2471
    • 製造零件編號 2CCS571001R0044 S401M-C4
    HK$463.50
    ABB
    1
    4A
    Type C
    240V
    -
    -
    -
    SMISSLINE TP
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 140-955
    • 製造零件編號 2CCS882001R0325
    HK$2,041.69
    ABB
    2
    32A
    Type B
    415V
    S802C
    25 kA
    -
    -
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$368.00
    Lovato
    2
    25A
    Type B
    230 V, 400V
    P1MB
    10 kA
    80V
    ModuLo
    10 kA
    DIN Rail Mount
    MCB
    86.5mm
    36mm
    80mm
    -
    -
    -
    -
    Better World
    • RS庫存編號 237-3199
    • 製造零件編號 2CDS251103R0204
    HK$462.40
    ABB
    1+N
    20A
    Type C
    -
    S200
    -
    -
    System Pro M Compact
    -
    DIN Rail Mount
    -
    -
    -
    -
    S201-C20NA
    Designed for disassembly
    Yes
    -
    • RS庫存編號 849-6468
    • 製造零件編號 EUC1P10B
    HK$64.50
    Europa
    1
    10A
    Type B
    230 V, 400V
    EUB
    10 kA
    -
    EUC1P
    10 kA
    DIN Rail Mount
    MCB
    18mm
    78mm
    87mm
    EUC1P10B
    -
    -
    -
    HK$2,141.11
    Schneider Electric
    2
    63A
    Type C
    440V
    iC60H
    10 kA
    125V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    -
    78.5mm
    85mm
    -
    -
    Yes
    Green Premium
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