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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$691.10
    Schneider Electric
    1+N
    6A
    Type C
    230V
    Acti9 iDT40N
    10 kA
    -
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    18mm
    74mm
    85mm
    IDT40N
    -
    Yes
    Green Premium
    HK$712.20
    Eaton
    2
    6A
    Type C
    240 → 415V
    FAZ
    10 kA
    60V
    xEffect
    10 kA
    DIN Rail Mount
    MCB
    80mm
    36mm
    80mm
    -
    -
    -
    -
    • RS庫存編號 624-0456
    • 製造零件編號 278869 FAZ-C10/3
    HK$905.40
    Eaton
    3
    10A
    Type C
    400V
    -
    10 kA
    -
    xEffect
    10 kA
    DIN Rail Mount
    MCB
    80mm
    52.5mm
    74mm
    -
    -
    -
    -
    Better World
    • RS庫存編號 238-3407
    • 製造零件編號 A9P34725
    HK$1,939.04
    Schneider Electric
    3+N
    25A
    Type D
    400V
    Acti9 iDT40N
    -
    -
    Acti 9
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    -
    Yes
    Green Premium
    Better World
    HK$501.80
    Schneider Electric
    1
    6A
    Type C
    240V
    iC60N
    10 kA
    72V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    -
    78.5mm
    85mm
    -
    -
    Yes
    Green Premium
    Better World
    HK$560.50
    Schneider Electric
    3
    32A
    Type C
    440V
    C60SP
    15 kA
    -
    Multi 9
    15 kA
    DIN Rail Mount
    Residential MCB
    54mm
    81mm
    72mm
    M9F22332
    -
    Yes
    Green Premium
    • RS庫存編號 124-3036
    • 製造零件編號 EMCH120 EMCH120
    HK$234.20
    Eaton
    1
    20A
    Type C
    230 V, 240V
    -
    10 kA
    48V
    MEMShield
    10 kA
    DIN Rail Mount
    MCB
    18mm
    75mm
    80mm
    -
    -
    -
    -
    HK$204.00
    Schneider Electric
    1
    16A
    Type D
    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
    Better World
    HK$1,144.30
    Schneider Electric
    3
    10A
    Type D
    -
    C60N
    10 kA
    -
    Multi 9
    10 kA
    DIN Rail Mount
    MCB
    81mm
    54mm
    72mm
    -
    -
    Yes
    Green Premium
    • RS庫存編號 847-3295
    • 製造零件編號 278861 FAZ-C2/3
    HK$896.40
    Eaton
    3
    2A
    Type C
    240 → 415V
    -
    10 kA
    -
    xEffect
    10 kA
    DIN Rail Mount
    MCB
    54mm
    85mm
    73mm
    -
    -
    -
    -
    HK$853.48
    Schneider Electric
    2
    16A
    Type D
    440V
    M9F1
    6 kA
    125V
    Multi9
    6 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 204-246
    • 製造零件編號 2CDS243701R0324
    HK$1,387.83
    ABB
    3
    32A
    Type C
    400V
    S203L
    6 kA
    -
    -
    6 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$2,112.51
    Legrand
    3
    25A
    Type D
    400V
    -
    10 kA
    -
    DX3
    10 kA
    DIN Rail Mount
    MCB
    -
    -
    -
    -
    -
    -
    -
    HK$457.03
    Lovato
    1+N
    25A
    Type C
    230V
    P1MB
    6 kA
    60V
    ModuLo
    6 kA
    DIN Rail Mount
    MCB
    86.5mm
    36mm
    80mm
    -
    -
    -
    -
    HK$829.50
    Schneider Electric
    3
    20A
    Type B
    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 225-5972
    • 製造零件編號 2CCS891001R0634 S801N C 63A - 36 KA
    HK$726.09
    ABB
    1
    63A
    Type C
    -
    S800N
    -
    -
    High Performance
    -
    DIN Rail Mount
    -
    -
    -
    -
    S801N-C63A
    -
    -
    -
    Better World
    HK$2,127.30
    Schneider Electric
    3
    2A
    Type D
    440V
    C60BP
    15 kA
    -
    Multi 9
    15 kA
    DIN Rail Mount
    Residential MCB
    103mm
    54mm
    72mm
    M9F43302
    -
    Yes
    Green Premium
    HK$397.20
    Schneider Electric
    1
    1A
    Type D
    415V
    C60SP
    20 kA
    60V
    Multi 9
    20 kA
    DIN Rail Mount
    Residential MCB
    81mm
    18mm
    72mm
    M9F23101
    -
    Yes
    Green Premium
    • RS庫存編號 245-983
    • 製造零件編號 132734 FAZ-B3/1-RT
    HK$332.03
    Eaton
    1
    3A
    Type B
    240V
    FAZ
    15 kA
    60V
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 200-325
    • 製造零件編號 2CDS242701R0164
    HK$717.89
    ABB
    2
    16A
    Type C
    400V
    S202L
    6 kA
    -
    -
    6 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
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