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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

    HK$383.70
    Siemens
    1
    32A
    Type B
    400V
    5SJ4
    14 kA
    60V
    SENTRON
    14 kA
    DIN Rail Mount
    MCB
    90mm
    18mm
    70mm
    5SJ4132
    -
    -
    -
    Better World
    • RS庫存編號 209-7510
    • 製造零件編號 5SV6016-6GV13
    个(每托盘 12 )
    HK$1,553.933
    Siemens
    2
    13A
    -
    230V
    5SV6
    6 kA
    -
    Sentron
    6 kA
    DIN Rail Mount
    MCB
    90mm
    18mm
    68.5mm
    -
    Extended product life
    Yes
    -
    • RS庫存編號 210-3398
    • 製造零件編號 5ST3791-2
    个(每托盘 10 )
    HK$63.48
    Siemens
    -
    80A
    -
    -
    5ST3
    -
    -
    SENTRON
    -
    DIN Rail Mount
    MCB
    -
    -
    -
    5ST3791
    -
    -
    -
    Better World
    HK$1,026.30
    Siemens
    2
    50A
    Type B
    400V
    5SY7
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SY7250
    Extended product life
    Yes
    -
    • RS庫存編號 230-786
    • 製造零件編號 115381 FAZ-D63/3N
    HK$2,985.52
    Eaton
    3+N
    63A
    Type D
    400V
    FAZ
    10 kA
    -
    xEffect
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 210-3378
    • 製造零件編號 5SL4504-6
    HK$535.60
    Siemens
    1+N
    4A
    Type B
    230V
    5SL4
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SL4504
    Extended product life
    Yes
    -
    Better World
    HK$208.50
    Siemens
    1
    25A
    Type B
    400V
    5SY7
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    18mm
    76mm
    5SY7125-6
    Extended product life
    Yes
    -
    HK$1,354.40
    Schneider Electric
    2
    35A
    Type D
    440V
    C60BP
    15 kA
    125V
    Multi 9
    15 kA
    DIN Rail Mount
    Residential MCB
    103mm
    36mm
    72mm
    M9F43235
    -
    Yes
    Green Premium
    Better World
    HK$673.60
    Siemens
    2
    6A
    Type B
    400V
    5SY7
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SY7206
    Extended product life
    Yes
    -
    Better World
    HK$403.60
    Siemens
    1
    13A
    Type B
    400V
    5SY5
    10 kA
    220V
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    90mm
    18mm
    76mm
    5SY5113-6
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 210-3388
    • 製造零件編號 5SL4613-6
    HK$1,177.50
    Siemens
    3+N
    13A
    Type B
    400V
    5SL4
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SL4613
    Extended product life
    Yes
    -
    Better World
    HK$436.20
    Siemens
    1+N
    25A
    Type B
    230V
    5SY6
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SY6525-6
    Extended product life
    Yes
    -
    Better World
    HK$661.30
    Siemens
    1+N
    50A
    Type B
    230V
    5SY6
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SY6550-6
    Extended product life
    Yes
    -
    • RS庫存編號 240-473
    • 製造零件編號 102125 FAZ-C7/1-RT
    HK$590.59
    Eaton
    1
    7A
    Type C
    240V
    FAZ
    15 kA
    60V
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 210-3367
    • 製造零件編號 5SL4401-6
    HK$1,361.80
    Siemens
    3+N
    1A
    Type B
    400V
    5SL4
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SL4401
    Extended product life
    Yes
    -
    Better World
    HK$1,203.80
    Siemens
    2
    20A
    Type B
    400V
    5SY5
    10 kA
    440V
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SY5220-6
    Extended product life
    Yes
    -
    Better World
    HK$743.10
    Siemens
    1
    63A
    Type B
    400V
    5SY5
    10 kA
    220V
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    90mm
    18mm
    76mm
    5SY5163-6
    Extended product life
    Yes
    -
    Better World
    HK$314.00
    Siemens
    1
    63A
    Type B
    400V
    5SY7
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    18mm
    76mm
    5SY7163-6
    Extended product life
    Yes
    -
    Better World
    HK$610.00
    Siemens
    2
    16A
    Type B
    400V
    5SY7
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SY7216-6
    Extended product life
    Yes
    -
    Better World
    HK$610.00
    Siemens
    2
    20A
    Type B
    400V
    5SY7
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SY7220-6
    Extended product life
    Yes
    -
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