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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 212-1615
    • 製造零件編號 2CDS252280R0024
    HK$384.80
    ABB
    2
    2A
    Type C
    415V
    S200C
    6 kA
    -
    -
    6 kA
    DIN Rail Mount
    MCB
    70mm
    18mm
    70mm
    S202C-C2
    Designed for disassembly
    Yes
    -
    • RS庫存編號 144-4951
    • 製造零件編號 MJT720
    HK$315.47
    Hager
    2
    20A
    Type C
    240 → 400V
    MJT
    6 kA
    -
    -
    6 kA
    DIN Rail Mount
    MCB
    96.1mm
    17.5mm
    85mm
    -
    -
    -
    -
    • RS庫存編號 183-3622
    • 製造零件編號 2CDS242701R0164
    HK$443.30
    ABB
    2
    16A
    Type C
    400V
    S200L
    6 kA
    -
    System Pro M Compact
    6 kA
    DIN Rail Mount
    MCB
    35mm
    69mm
    88mm
    S202L-C16
    -
    -
    -
    HK$2,603.34
    ABB
    3
    1.6A
    Type K
    400V
    S200
    10 kA
    110V
    System Pro M Compact
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$1,460.60
    Schneider Electric
    4
    40A
    Type C
    440 V, 12 → 133 V, 220 → 240 V, 380 → 415V
    iC60H
    10 kA
    220 → 250V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    85mm
    72mm
    78.5mm
    -
    -
    Yes
    Green Premium
    Better World
    • RS庫存編號 231-9695
    • 製造零件編號 2CDS271001R0337 S201M K 4A - 15 KA
    毎盒:1 个
    HK$316.20
    ABB
    1
    4A
    Type K
    253V
    S200M
    25 kA
    72V
    System Pro M Compact
    25 kA
    DIN Rail Mount
    MCB
    88mm
    17.5mm
    69mm
    S201M-K4
    Designed for disassembly
    Yes
    -
    • RS庫存編號 203-771
    • 製造零件編號 2CDS241701R0324
    HK$377.36
    ABB
    1
    32A
    Type C
    230/400V
    S201L
    6 kA
    -
    -
    6 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$200.30
    Schneider Electric
    1
    32A
    Type C
    100 → 133 V, 12 → 60 V, 220 → 240V
    iC60N
    6 kA
    12 → 48 V, 72V
    Acti 9
    6 kA
    DIN Rail Mount
    MCB
    18mm
    85mm
    78.5mm
    -
    -
    Yes
    Green Premium
    Better World
    • RS庫存編號 232-2282
    • 製造零件編號 5SY4102-5
    HK$350.00
    Siemens
    1
    2A
    Type A
    -
    5SY
    -
    -
    SENTRON
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    Extended product life
    Yes
    -
    Better World
    HK$482.50
    Schneider Electric
    1
    3A
    Type C
    240V
    iC60N
    10 kA
    72V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    -
    -
    85mm
    -
    -
    Yes
    Green Premium
    Better World
    HK$1,515.17
    Schneider Electric
    3
    32A
    Type C
    400V
    Acti9 iDT40N
    10 kA
    -
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    54mm
    74mm
    85mm
    IDT40N
    -
    Yes
    Green Premium
    Better World
    HK$92.60
    Schneider Electric
    1
    10A
    Type B
    230V
    EZ9
    6 kA
    -
    Easy 9
    6 kA
    DIN Rail Mount
    Residential MCB
    82mm
    18mm
    72mm
    -
    -
    Yes
    Green Premium
    HK$2,665.86
    Schneider Electric
    2
    50A
    Type B
    500V
    A9F7
    6000 A
    -
    Acti9
    6000 A
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$1,447.10
    Schneider Electric
    2
    10A
    Type D
    440V
    iC60H
    10 kA
    125V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    -
    78.5mm
    85mm
    -
    -
    Yes
    Green Premium
    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
    • RS庫存編號 144-4961
    • 製造零件編號 NEN206
    HK$1,429.55
    Hager
    2
    6A
    Type B
    240 → 400V
    NEN
    10 kA
    -
    -
    10 kA
    DIN Rail Mount
    MCB
    83mm
    35mm
    70mm
    -
    -
    -
    -
    Better World
    • RS庫存編號 209-6510
    • 製造零件編號 5SL4420-8
    HK$1,612.30
    Siemens
    3+N
    20A
    Type D
    400V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    72mm
    76mm
    90mm
    5SL4420-8
    Extended product life
    Yes
    -
    HK$1,308.19
    ABB
    1
    500mA
    Type Z
    230V
    S200 M UC
    10 kA
    220V
    System Pro M Compact
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 183-3623
    • 製造零件編號 2CDS242701R0064
    HK$487.30
    ABB
    2
    6A
    Type C
    400V
    S200L
    6 kA
    -
    System Pro M Compact
    6 kA
    DIN Rail Mount
    MCB
    35mm
    69mm
    88mm
    S202L-C6
    -
    -
    -
    Better World
    • RS庫存編號 219-9119
    • 製造零件編號 M9F22110
    HK$764.60
    Schneider Electric
    1
    10A
    Type C
    -
    -
    10 kA
    -
    Multi 9
    10 kA
    DIN Rail Mount
    MCB
    81mm
    18mm
    72mm
    C60SP
    -
    Yes
    Green Premium
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