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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$2,330.40
    Siemens
    4
    40A
    Type C
    400V
    5SY7
    15 kA
    72V
    SENTRON
    15 kA
    DIN Rail Mount
    MCB
    72mm
    76mm
    90mm
    5SY7440-7
    Extended product life
    Yes
    -
    Better World
    HK$1,913.60
    Siemens
    4
    32A
    Type C
    400V
    5SY7
    15 kA
    72V
    SENTRON
    15 kA
    DIN Rail Mount
    MCB
    72mm
    76mm
    90mm
    5SY7432-7
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-6652
    • 製造零件編號 5SL4616-7
    HK$1,177.50
    Siemens
    3+N
    16A
    Type C
    400V
    5SL4
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SL4616-7
    Extended product life
    Yes
    -
    Better World
    HK$639.60
    Siemens
    2
    13A
    Type C
    400V
    5SY6
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SY6208-7
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-6543
    • 製造零件編號 5SL4608-8
    HK$1,604.30
    Siemens
    3+N
    8A
    Type D
    400V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    72mm
    76mm
    90mm
    5SL4608-8
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-6619
    • 製造零件編號 5SL4132-7
    HK$233.80
    Siemens
    1
    32A
    Type C
    400V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    18mm
    76mm
    90mm
    5SL4132-7
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-6529
    • 製造零件編號 5SL4520-8
    HK$567.10
    Siemens
    1+N
    20A
    Type D
    230V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    36mm
    76mm
    90mm
    5SL4520-8
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 746-7879
    • 製造零件編號 2CDS252001R0321 S202-D32
    HK$569.10
    ABB
    2
    32A
    Type D
    400V
    S200
    10 kA
    125V
    System Pro M Compact
    10 kA
    DIN Rail Mount
    MCB
    88mm
    35mm
    69mm
    S202-D32
    Designed for disassembly
    Yes
    -
    Better World
    • RS庫存編號 209-6552
    • 製造零件編號 5SL4640-8
    HK$2,252.50
    Siemens
    3+N
    40A
    Type D
    400V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    72mm
    76mm
    90mm
    5SL4640-8
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-6631
    • 製造零件編號 5SL4313-7
    HK$806.60
    Siemens
    3
    13A
    Type C
    400V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    54mm
    76mm
    90mm
    5SL4313-7
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-6452
    • 製造零件編號 5SL4108-8
    HK$308.70
    Siemens
    1
    8A
    Type D
    400V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    18mm
    76mm
    90mm
    5SL4108-8
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-6464
    • 製造零件編號 5SL4163-8
    HK$632.80
    Siemens
    1
    63A
    Type D
    400V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    18mm
    76mm
    90mm
    5SL4163-8
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-7499
    • 製造零件編號 5SL4650-6
    HK$1,636.60
    Siemens
    3+N
    50A
    Type B
    400V
    5SL4
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SL4650-6
    Extended product life
    Yes
    -
    • RS庫存編號 209-6560
    • 製造零件編號 5SP4180-8
    HK$856.50
    Siemens
    1
    80A
    Type D
    400V
    5SP4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    27mm
    76mm
    90mm
    5SP4180-8
    -
    -
    -
    Better World
    • RS庫存編號 209-7442
    • 製造零件編號 5SL4208-7
    HK$713.00
    Siemens
    2
    8A
    Type C
    400V
    5SL4
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SL4208-7
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-7487
    • 製造零件編號 5SL4532-7
    HK$584.20
    Siemens
    1+N
    32A
    Type C
    230V
    5SL4
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SL4532-7
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-6645
    • 製造零件編號 5SL4525-7
    HK$521.30
    Siemens
    1+N
    25A
    Type C
    230V
    5SL4
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SL4525-7
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-6534
    • 製造零件編號 5SL4563-8
    HK$1,272.00
    Siemens
    1+N
    63A
    Type D
    230V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    36mm
    76mm
    90mm
    5SL4563-8
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-6456
    • 製造零件編號 5SL4115-8
    HK$308.70
    Siemens
    1
    1.6A
    Type D
    400V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    18mm
    76mm
    90mm
    5SL4115-8
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-6501
    • 製造零件編號 5SL4404-8
    HK$1,758.10
    Siemens
    3+N
    4A
    Type D
    400V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    72mm
    76mm
    90mm
    5SL4404-8
    Extended product life
    Yes
    -
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