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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

    • RS庫存編號 597-940
    • 製造零件編號 NQN450
    HK$4,482.85
    Hager
    4
    50A
    Type B
    415V
    NQN
    15 kA
    -
    -
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 597-862
    • 製造零件編號 NQN220
    HK$1,544.07
    Hager
    2
    20A
    Type B
    415V
    NQN
    25 kA
    -
    -
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 597-861
    • 製造零件編號 NQN216
    HK$1,544.66
    Hager
    2
    16A
    Type B
    415V
    NQN
    25 kA
    -
    -
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 597-938
    • 製造零件編號 NQN432
    HK$3,236.92
    Hager
    4
    32A
    Type B
    415V
    NQN
    20 kA
    -
    -
    20 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 597-948
    • 製造零件編號 NRN340
    HK$2,355.45
    Hager
    3
    40A
    Type C
    415V
    NRN
    20 kA
    -
    -
    20 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 597-860
    • 製造零件編號 NQN210
    HK$1,544.49
    Hager
    2
    10A
    Type B
    415V
    NQN
    25 kA
    -
    -
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 597-907
    • 製造零件編號 NSN306
    HK$2,848.84
    Hager
    3
    6A
    Type D
    415V
    NSN
    25 kA
    -
    -
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 597-954
    • 製造零件編號 NSN225
    HK$1,772.53
    Hager
    2
    25A
    Type D
    415V
    NSN
    25 kA
    -
    -
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 597-950
    • 製造零件編號 NRN440
    HK$3,244.23
    Hager
    4
    40A
    Type C
    415V
    NRN
    20 kA
    -
    -
    20 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 597-952
    • 製造零件編號 NSN216
    HK$1,709.49
    Hager
    2
    16A
    Type D
    415V
    NSN
    25 kA
    -
    -
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 597-903
    • 製造零件編號 NGN301
    HK$1,931.56
    Hager
    3
    1A
    Type D
    400V
    NGN
    10 kA
    -
    -
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$445.65
    Hager
    1
    500mA
    Type C
    230 → 400V
    NFN
    10 kA
    -
    -
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 597-949
    • 製造零件編號 NRN363
    HK$2,909.95
    Hager
    3
    63A
    Type C
    415V
    NRN
    15 kA
    -
    -
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 597-909
    • 製造零件編號 NSN406
    HK$3,861.19
    Hager
    4
    6A
    Type D
    415V
    NSN
    25 kA
    -
    -
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 611-275
    • 製造零件編號 PLSM-D32-Q-MW
    HK$358.20
    Eaton
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    HK$3,885.60
    Schneider Electric
    2
    16A
    Type C
    230V
    Acti9
    20 kA
    -
    Acti 9
    20 kA
    DIN Rail Mount
    MCB
    -
    81mm
    77mm
    A9C62216
    -
    Yes
    Green Premium
    HK$3,748.56
    Schneider Electric
    1P + N
    20A
    Type C
    240V
    QO120
    10000 A
    -
    Square D
    10000 A
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$2,025.28
    Schneider Electric
    4
    16A
    -
    440V
    A9F76
    6000 A
    250V
    Acti9
    6000 A
    -
    MCB
    -
    -
    -
    -
    -
    -
    -
    HK$1,161.85
    ABB
    1
    1A
    Type K
    230V
    S200 M UC
    10 kA
    220V
    System Pro M Compact
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$952.70
    Schneider Electric
    1
    13A
    Type B
    240 V, 415 V
    Multi9 C60
    20 kA
    60V
    Multi9
    20 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
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