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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 203-2334
    • 製造零件編號 5SY6125-7
    HK$205.80
    Siemens
    1
    25A
    Type C
    -
    5SY6
    6 kA
    -
    SENTRON
    6 kA
    DIN Rail Mount
    MCB
    -
    -
    -
    -
    Extended product life
    Yes
    -
    HK$1,415.10
    Siemens
    2
    1A
    Type C
    400V
    5SJ4201
    10 kA
    60V
    SENTRON
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$558.74
    Schneider Electric
    1
    25A
    Type D
    230V
    Resi9 XE DM
    3000 A
    -
    Resi9
    3000 A
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 287-6097
    • 製造零件編號 R9PSC2
    HK$357.17
    Schneider Electric
    1
    20A
    -
    250V
    Resi9 XP CM
    -
    -
    Resi9
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$557.20
    Siemens
    1
    8A
    Type D
    400V
    5SJ4108
    14 kA
    60V
    SENTRON
    14 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$183.64
    Schneider Electric
    1
    32A
    Type B
    230V
    R9F2
    6 kA
    -
    Resi9
    6 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$467.80
    Lovato
    2
    4A
    Type D
    230 V, 400V
    P1MB
    10 kA
    80V
    ModuLo
    10 kA
    DIN Rail Mount
    MCB
    86.5mm
    36mm
    80mm
    -
    -
    -
    -
    Better World
    HK$1,487.30
    Schneider Electric
    2
    500mA
    Type C
    -
    C60H-DC
    20 kA
    500V
    Acti 9
    20 kA
    DIN Rail Mount
    MCB
    36mm
    -
    81mm
    -
    -
    Yes
    Green Premium
    HK$220.50
    Schneider Electric
    1
    50A
    Type C
    100 → 133 V, 12 → 60 V, 220 → 240V
    iC60H
    10 kA
    72 V, 12 → 48V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    85mm
    18mm
    78.5mm
    -
    -
    Yes
    Green Premium
    • RS庫存編號 922-6898
    • 製造零件編號 102084 FAZ-C6/1-NA
    HK$334.50
    Eaton
    1
    6A
    Type C
    240 → 415V
    -
    10 kA
    48V
    xEffect
    10 kA
    DIN Rail Mount
    MCB
    17.8mm
    66mm
    80mm
    FAZ-C6/1-NA
    -
    -
    -
    • RS庫存編號 922-6955
    • 製造零件編號 278523 FAZ-B2/1
    HK$263.90
    Eaton
    1
    2A
    Type B
    240V
    -
    10 kA
    48V
    xEffect
    10 kA
    DIN Rail Mount
    MCB
    17.8mm
    66mm
    80mm
    -
    -
    -
    -
    HK$748.50
    Legrand
    1
    16A
    Type C
    230V
    -
    25 kA
    -
    DX3
    25 kA
    DIN Rail Mount
    MCB
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 746-8144
    • 製造零件編號 2CDS271001R0201 S201M-D20
    HK$157.00
    ABB
    1
    20A
    Type D
    230V
    S200M
    15 kA
    72V
    System Pro M Compact
    15 kA
    DIN Rail Mount
    MCB
    88mm
    17.5mm
    69mm
    S201M-D20
    -
    -
    -
    Better World
    HK$652.72
    Schneider Electric
    1
    20A
    Type C
    -
    C60H-DC
    20 kA
    250V
    Acti 9
    20 kA
    DIN Rail Mount
    MCB
    18mm
    73mm
    81mm
    -
    -
    Yes
    Green Premium
    HK$580.00
    Schneider Electric
    2
    20A
    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$1,046.40
    Schneider Electric
    3
    1A
    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
    • RS庫存編號 231-9683
    • 製造零件編號 2CDS253001R0825 S203-B100 6kA
    毎盒:1 个
    HK$1,795.60
    ABB
    3
    100A
    Type B
    440V
    S200
    10 kA
    -
    System Pro M Compact
    10 kA
    DIN Rail Mount
    MCB
    88mm
    52.5mm
    69mm
    S203-B100
    -
    -
    -
    • RS庫存編號 849-6550
    • 製造零件編號 EUC2P20C
    HK$172.00
    Europa
    2
    20A
    Type C
    230 V, 400V
    EUC
    10 kA
    -
    EUC2P
    10 kA
    DIN Rail Mount
    MCB
    36mm
    78mm
    87mm
    EUC2P20C
    -
    -
    -
    Better World
    • RS庫存編號 202-7045
    • 製造零件編號 5SL4101-6
    HK$187.60
    Siemens
    1
    1A
    Type B
    -
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    -
    -
    -
    -
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-6465
    • 製造零件編號 5SL4203-8
    HK$875.00
    Siemens
    2
    3A
    Type D
    400V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    36mm
    76mm
    90mm
    5SL4203-8
    Extended product life
    Yes
    -
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