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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

    HK$995.90
    Schneider Electric
    3
    50A
    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
    54mm
    78.5mm
    -
    -
    Yes
    Green Premium
    Better World
    HK$1,162.60
    Siemens
    3
    500mA
    Type D
    400V
    5SY4
    10 kA
    72V
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    54mm
    76mm
    90mm
    5SY4305-8
    Extended product life
    Yes
    -
    • RS庫存編號 847-3267
    • 製造零件編號 278759 FAZ-C15/2
    HK$640.14
    Eaton
    2
    15A
    Type C
    240 → 415V
    -
    10 kA
    415V
    xEffect
    10 kA
    DIN Rail Mount
    MCB
    80mm
    36mm
    80mm
    FAZ-C15/2
    -
    -
    -
    Better World
    • RS庫存編號 132-116
    • 製造零件編號 2CDS272001R0204 S202M-C20
    HK$506.20
    ABB
    2
    20A
    Type C
    440V
    S200M
    10 kA
    125V
    System Pro M Compact
    10 kA
    DIN Rail Mount
    MCB
    88mm
    35mm
    76mm
    S202M-C20
    Designed for disassembly
    Yes
    -
    Better World
    • RS庫存編號 131-961
    • 製造零件編號 2CDS272001R0254 S202M-C25
    HK$506.20
    ABB
    2
    25A
    Type C
    440V
    S200M
    10 kA
    125V
    System Pro M Compact
    10 kA
    DIN Rail Mount
    MCB
    88mm
    35mm
    76mm
    S202M-C25
    Designed for disassembly
    Yes
    -
    Better World
    • RS庫存編號 132-037
    • 製造零件編號 2CDS272001R0405 S202M-B40
    HK$435.10
    ABB
    2
    40A
    Type B
    440V
    S200M
    10 kA
    125V
    System Pro M Compact
    10 kA
    DIN Rail Mount
    MCB
    69mm
    35mm
    69mm
    S202M-B40
    Designed for disassembly
    Yes
    -
    Better World
    • RS庫存編號 131-977
    • 製造零件編號 2CDS272001R0084 S202M-C8
    HK$441.40
    ABB
    2
    8A
    Type C
    440V
    S200M
    10 kA
    125V
    System Pro M Compact
    10 kA
    DIN Rail Mount
    MCB
    69mm
    35mm
    69mm
    S202M-C8
    Designed for disassembly
    Yes
    -
    Better World
    • RS庫存編號 131-911
    • 製造零件編號 2CDS272001R0105 S202M-B10
    HK$547.60
    ABB
    2
    10A
    Type B
    440V
    S200M
    10 kA
    125V
    System Pro M Compact
    10 kA
    DIN Rail Mount
    MCB
    88mm
    35mm
    76mm
    S202M-B10
    Designed for disassembly
    Yes
    -
    Better World
    • RS庫存編號 131-983
    • 製造零件編號 2CDS272001R0044 S202M-C4
    HK$611.50
    ABB
    2
    4A
    Type C
    440V
    S200M
    10 kA
    125V
    System Pro M Compact
    10 kA
    DIN Rail Mount
    MCB
    88mm
    35mm
    76mm
    S202M-C4
    Designed for disassembly
    Yes
    -
    • RS庫存編號 849-6459
    • 製造零件編號 EUC1P1B
    HK$100.80
    Europa
    1
    1A
    Type B
    230 V, 400V
    EUB
    10 kA
    -
    EUC1P
    10 kA
    DIN Rail Mount
    MCB
    18mm
    78mm
    87mm
    EUC1P1B
    -
    -
    -
    Better World
    • RS庫存編號 209-7441
    • 製造零件編號 5SL4208-6
    HK$521.30
    Siemens
    2
    8A
    Type B
    400V
    5SL4
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SL4208-6
    Extended product life
    Yes
    -
    • RS庫存編號 849-6563
    • 製造零件編號 EUC2P63C
    HK$132.60
    Europa
    2
    63A
    Type C
    230 V, 400V
    EUC
    10 kA
    -
    EUC2P
    10 kA
    DIN Rail Mount
    MCB
    36mm
    78mm
    87mm
    EUC2P63C
    -
    -
    -
    HK$1,166.90
    Eaton
    3
    63A
    Type D
    240 → 415V
    FAZ
    10 kA
    96V
    xEffect
    10 kA
    DIN Rail Mount
    MCB
    80mm
    54mm
    80mm
    -
    -
    -
    -
    Better World
    • RS庫存編號 238-3204
    • 製造零件編號 5SV6016-6MC16
    HK$2,489.10
    Siemens
    1+N
    16A
    Type B
    230V
    -
    -
    -
    SENTRON
    -
    DIN Rail Mount
    AFDD
    -
    -
    -
    -
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 238-3208
    • 製造零件編號 5SV6016-6MC32
    HK$2,474.20
    Siemens
    1+N
    32A
    Type B
    230V
    -
    -
    -
    SENTRON
    -
    DIN Rail Mount
    AFDD
    -
    -
    -
    -
    Extended product life
    Yes
    -
    • RS庫存編號 287-6357
    • 製造零件編號 2CDS251103R0164
    个(每托盘 5 )
    HK$322.00
    ABB
    1+N
    16A
    Type C
    230V
    S201
    10 kA
    110V
    -
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 238-3438
    • 製造零件編號 A9PA4725
    HK$2,174.80
    Schneider Electric
    3+N
    25A
    Type C
    400V
    Acti9 iDT40N XA
    -
    -
    Acti 9
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 769-4564
    • 製造零件編號 239103 FAZ6-C16/2
    HK$503.40
    Eaton
    2
    16A
    Type C
    230 → 400V
    -
    6 kA
    -
    xEffect
    6 kA
    DIN Rail Mount
    MCB
    80mm
    17.5mm
    62mm
    -
    -
    -
    -
    HK$2,666.49
    Schneider Electric
    4
    4A
    Type C
    400V
    IC60L
    20 kA, 15 kA
    250V
    Acti 9
    20 kA, 15 kA
    DIN Rail Mount
    MCB
    85mm
    72mm
    78.5mm
    Acti 9 iC60
    -
    Yes
    Green Premium
    • RS庫存編號 535-4144
    • 製造零件編號 2CDS271001R0104 S201M-C10
    HK$188.90
    ABB
    1
    10A
    Type C
    253V
    S200M
    10 kA
    72V
    System Pro M Compact
    10 kA
    DIN Rail Mount
    MCB
    88mm
    17.5mm
    69mm
    S201M-C10
    -
    -
    -
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