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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$1,161.85
    ABB
    1
    300mA
    Type K
    230V
    S200 M UC
    10 kA
    220V
    System Pro M Compact
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$495.70
    Siemens
    1
    300mA
    Type C
    400V
    5SJ4114
    14 kA
    60V
    SENTRON
    14 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$1,406.30
    Siemens
    2
    500mA
    Type C
    400V
    5SJ4205
    14 kA
    60V
    SENTRON
    14 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 287-6363
    • 製造零件編號 2CDS272061R0337
    HK$1,150.99
    ABB
    2
    4A
    Type K
    440V
    S202M
    10 kA
    440V
    -
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    HK$1,657.20
    Siemens
    2
    63A
    Type B
    400V
    5SY5
    10 kA
    440V
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SY5263-6
    Extended product life
    Yes
    -
    HK$3,661.96
    ABB
    4
    2A
    Type K
    400V
    S200
    10 kA
    110V
    System Pro M Compact
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$2,592.69
    ABB
    3
    6A
    Type Z
    400V
    S200
    10 kA
    110V
    System Pro M Compact
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 144-4773
    • 製造零件編號 NGN406
    HK$2,670.51
    Hager
    4
    6A
    Type D
    230 → 400V
    NGN
    6 kA
    -
    -
    6 kA
    DIN Rail Mount
    MCB
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 144-4709
    • 製造零件編號 NFN203
    HK$1,201.42
    Hager
    2
    3A
    Type C
    240 → 400V
    NFN
    10 kA
    -
    -
    10 kA
    DIN Rail Mount
    MCB
    83mm
    35mm
    70mm
    -
    -
    -
    -
    HK$3,355.58
    ABB
    3
    8A
    Type D
    400V
    S200M
    15 kA
    125V
    System Pro M Compact
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$2,972.04
    Schneider Electric
    4
    25A
    Type B
    500V
    A9F7
    6000 A
    -
    Acti9
    6000 A
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 140-395
    • 製造零件編號 2CCS862001R0405
    HK$4,277.09
    ABB
    2
    40A
    Type B
    240V
    S800S
    50 kA
    -
    -
    50 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 144-4765
    • 製造零件編號 NGN232
    HK$1,251.31
    Hager
    2
    32A
    Type D
    230 → 400V
    NGN
    6 kA
    -
    -
    6 kA
    DIN Rail Mount
    MCB
    -
    -
    -
    -
    -
    -
    -
    HK$3,242.36
    ABB
    3
    500mA
    Type D
    400V
    S200M
    15 kA
    125V
    System Pro M Compact
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$3,456.98
    Schneider Electric
    2
    63A
    Type B
    500V
    A9F7
    6000 A
    -
    Acti9
    6000 A
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 140-321
    • 製造零件編號 2CCS864001R1557
    HK$13,313.49
    ABB
    4
    40A
    UC-K
    -
    S804S
    50 kA
    1000V
    -
    50 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$2,680.70
    Siemens
    3
    32A
    Type D
    400V
    5SJ4332
    10 kA
    60V
    SENTRON
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 140-860
    • 製造零件編號 2CCS861001R0161
    HK$1,599.53
    ABB
    1
    16A
    Type D
    240V
    S800S
    50 kA
    -
    -
    50 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 141-004
    • 製造零件編號 2CCS893001R0065
    HK$4,962.06
    ABB
    3
    6A
    Type B
    690V
    S803N
    36 kA
    -
    -
    36 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 140-933
    • 製造零件編號 2CCS891001R0061
    HK$1,845.30
    ABB
    1
    6A
    Type D
    400V
    S801N
    36 kA
    -
    -
    36 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
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