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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 746-8163
    • 製造零件編號 2CDS272001R0101 S202M-D10
    HK$587.10
    ABB
    2
    10A
    Type D
    400V
    S200M
    10 kA
    125V
    System Pro M Compact
    10 kA
    DIN Rail Mount
    MCB
    88mm
    35mm
    69mm
    S202M-D10
    Designed for disassembly
    Yes
    -
    Better World
    HK$839.76
    Schneider Electric
    -
    13A
    Type D
    400V
    iDPN
    6 kA
    -
    Acti 9
    6 kA
    DIN Rail Mount
    MCB
    54mm
    70mm
    90mm
    -
    -
    Yes
    Green Premium
    Better World
    HK$495.07
    Schneider Electric
    -
    40A
    Type C
    230V
    iDPN
    10 kA
    -
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    18mm
    -
    80mm
    -
    -
    Yes
    Green Premium
    • RS庫存編號 825-5885
    • 製造零件編號 P1MB3PD20
    HK$643.90
    Lovato
    3
    20A
    Type D
    230 V, 400V
    P1MB
    10 kA
    -
    ModuLo
    10 kA
    DIN Rail Mount
    MCB
    86.5mm
    54mm
    80mm
    -
    -
    -
    -
    Better World
    • RS庫存編號 772-1347
    • 製造零件編號 5SY4232-7
    HK$671.20
    Siemens
    2
    32A
    Type C
    400V
    5SY4
    10 kA
    -
    Sentron
    10 kA
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    -
    Extended product life
    Yes
    -
    • RS庫存編號 188-1644
    • 製造零件編號 P1MBUH2PC03
    HK$1,078.65
    Lovato
    2
    3A
    Type C
    400V
    -
    10 kA
    125V
    -
    10 kA
    DIN Rail Mount
    MCB
    36mm
    76mm
    116mm
    P1MBUH2PC03
    -
    -
    -
    • RS庫存編號 769-4728
    • 製造零件編號 239109 FAZ6-C63/2
    HK$664.60
    Eaton
    2
    63A
    Type C
    230 → 400V
    -
    6 kA
    -
    xEffect
    6 kA
    DIN Rail Mount
    MCB
    80mm
    17.5mm
    62mm
    -
    -
    -
    -
    • RS庫存編號 825-5817
    • 製造零件編號 P1MB3PB50
    HK$815.70
    Lovato
    3
    50A
    Type B
    230 V, 400V
    P1MB
    10 kA
    -
    ModuLo
    10 kA
    DIN Rail Mount
    MCB
    86.5mm
    54mm
    80mm
    -
    -
    -
    -
    • RS庫存編號 769-4731
    • 製造零件編號 239179 FAZ6-C63/3N
    HK$1,545.90
    Eaton
    3
    63A
    Type C
    230 → 400V
    -
    6 kA
    -
    xEffect
    6 kA
    DIN Rail Mount
    MCB
    80mm
    53mm
    62mm
    -
    -
    -
    -
    • RS庫存編號 825-5942
    • 製造零件編號 P1MB4PC01
    HK$1,161.60
    Lovato
    4
    1A
    Type C
    230 V, 400V
    P1MB
    10 kA
    -
    ModuLo
    10 kA
    DIN Rail Mount
    MCB
    86.5mm
    72mm
    80mm
    -
    -
    -
    -
    Better World
    • RS庫存編號 746-8138
    • 製造零件編號 2CDS271001R0011 S201M-D1
    HK$219.80
    ABB
    1
    1A
    Type D
    230V
    S200M
    15 kA
    72V
    System Pro M Compact
    15 kA
    DIN Rail Mount
    MCB
    88mm
    17.5mm
    69mm
    S201M-D1
    Designed for disassembly
    Yes
    -
    • RS庫存編號 922-7119
    • 製造零件編號 278743 FAZ-C0,5/2
    HK$610.00
    Eaton
    2
    500mA
    Type C
    240 → 415V
    -
    10 kA
    96V
    xEffect
    10 kA
    DIN Rail Mount
    MCB
    35.4mm
    66mm
    80mm
    -
    -
    -
    -
    HK$910.67
    Schneider Electric
    2
    4A
    Type C
    440V
    iC60H
    10 kA
    133V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    -
    78.5mm
    91mm
    -
    -
    Yes
    Green Premium
    • RS庫存編號 769-4605
    • 製造零件編號 239149 FAZ6-C20/3
    HK$607.70
    Eaton
    3
    20A
    Type C
    230 <arrow/> 415 V
    -
    6 kA
    -
    xEffect
    6 kA
    DIN Rail Mount
    MCB
    85mm
    53.1mm
    85mm
    FAZ6-C20/3
    -
    -
    -
    • RS庫存編號 825-5920
    • 製造零件編號 P1MB4PB20
    HK$1,047.27
    Lovato
    4
    20A
    Type B
    230 V, 400V
    P1MB
    10 kA
    -
    ModuLo
    10 kA
    DIN Rail Mount
    MCB
    86.5mm
    72mm
    80mm
    -
    -
    -
    -
    Better World
    • RS庫存編號 746-8009
    • 製造零件編號 2CDS252001R0487 S202-K20
    HK$614.60
    ABB
    2
    20A
    Type K
    400V
    S200
    6 kA
    125V
    System Pro M Compact
    6 kA
    DIN Rail Mount
    MCB
    88mm
    35mm
    69mm
    S202-K20
    Designed for disassembly
    Yes
    -
    • RS庫存編號 769-4441
    • 製造零件編號 239116 FAZ6-B32/3
    HK$607.90
    Eaton
    3
    32A
    Type B
    230 → 400V
    -
    6 kA
    -
    xEffect
    6 kA
    DIN Rail Mount
    MCB
    80mm
    17.5mm
    62mm
    -
    -
    -
    -
    • RS庫存編號 769-4510
    • 製造零件編號 239095 FAZ6-C0,5/2
    HK$549.30
    Eaton
    2
    500mA
    Type C
    230 → 400V
    -
    6 kA
    -
    xEffect
    6 kA
    DIN Rail Mount
    MCB
    80mm
    17.5mm
    62mm
    -
    -
    -
    -
    Better World
    • RS庫存編號 232-2295
    • 製造零件編號 5SY4225-5
    HK$943.60
    Siemens
    2
    25A
    Type A
    -
    5SY
    -
    -
    SENTRON
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    Extended product life
    Yes
    -
    • RS庫存編號 769-4665
    • 製造零件編號 239132 FAZ6-C4/3
    HK$710.40
    Eaton
    3
    4A
    Type C
    230 → 400V
    -
    6 kA
    -
    xEffect
    6 kA
    DIN Rail Mount
    MCB
    80mm
    17.5mm
    62mm
    -
    -
    -
    -
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