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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 246-2550
    • 製造零件編號 2CCS571103R8557
    HK$1,422.99
    ABB
    2
    40A
    Type K
    240V
    -
    -
    -
    SMISSLINE TP
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 246-2603
    • 製造零件編號 2CCS572001R0974
    HK$1,037.97
    ABB
    2
    1.6A
    Type C
    415V
    -
    -
    -
    SMISSLINE TP
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 746-8078
    • 製造零件編號 2CDS254001R0607 S204-K63
    HK$2,108.30
    ABB
    4
    63A
    Type K
    400V
    S200M
    6 kA
    -
    System Pro M Compact
    6 kA
    DIN Rail Mount
    MCB
    -
    -
    69mm
    S204-K63
    Designed for disassembly
    Yes
    -
    • RS庫存編號 246-2625
    • 製造零件編號 2CCS572001R1504
    HK$2,231.13
    ABB
    2
    50A
    Type C
    440V
    -
    -
    -
    SMISSLINE TP
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 246-2669
    • 製造零件編號 2CCS573103R8135
    HK$1,653.26
    ABB
    4
    13A
    Type B
    400V
    -
    -
    -
    SMISSLINE TP
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    -
    -
    -
    HK$2,112.93
    Schneider Electric
    4
    16A
    Type K
    400V
    A9F9
    20 kA, 15 kA
    250V
    Acti 9
    20 kA, 15 kA
    DIN Rail Mount
    MCB
    85mm
    72mm
    78.5mm
    iC60L
    -
    Yes
    Green Premium
    HK$1,617.10
    Legrand
    4
    16A
    Type C
    400V
    -
    10 kA
    -
    DX3
    10 kA
    DIN Rail Mount
    MCB
    -
    -
    -
    -
    -
    -
    -
    HK$3,237.40
    Schneider Electric
    4
    32A
    Type Z
    400V
    IC60L
    20 kA, 15 kA
    250V
    Acti 9
    20 kA, 15 kA
    DIN Rail Mount
    MCB
    85mm
    72mm
    78.5mm
    Acti 9 iC60
    -
    Yes
    Green Premium
    • RS庫存編號 240-604
    • 製造零件編號 102293 FAZ-C30/3-RT
    HK$2,129.86
    Eaton
    3
    30A
    Type C
    415V
    FAZ
    15 kA
    60V
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 140-424
    • 製造零件編號 2CCS893001R0101
    HK$4,817.25
    ABB
    3
    10A
    Type D
    690V
    S803N
    36 kA
    -
    -
    36 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    HK$3,171.50
    Siemens
    4
    80A
    Type B
    400V
    5SY4
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SY4480
    Extended product life
    Yes
    -
    Better World
    HK$1,425.10
    Siemens
    3+N
    6A
    Type D
    400V
    5SY4
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SY4606-8
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 383-2080
    • 製造零件編號 5SY4320-6
    HK$1,154.50
    Siemens
    3
    20A
    Type B
    400V
    5SY4
    10 kA
    -
    Sentron
    10 kA
    DIN Rail Mount
    MCB
    89.8mm
    53mm
    76mm
    -
    Extended product life
    Yes
    -
    HK$1,157.40
    Siemens
    3
    16A
    Type A
    400V
    5SY
    10 kA
    60V
    5SY41
    10 kA
    DIN Rail Mount
    MCB
    -
    -
    -
    -
    -
    -
    -
    Better World
    HK$2,662.10
    Siemens
    3+N
    50A
    Type C
    400V
    5SY7
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SY7650-7
    Extended product life
    Yes
    -
    • RS庫存編號 282-7131
    • 製造零件編號 278554 FAZ-C5/1
    HK$523.50
    Eaton
    1
    5A
    Type C
    -
    278554
    -
    -
    Moeller
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 287-6387
    • 製造零件編號 2CDS271103R0065
    HK$573.52
    ABB
    1+N
    6A
    Type B
    230V
    S201M
    15 kA
    60V
    -
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 140-562
    • 製造零件編號 2CCS894001R0204
    HK$5,921.73
    ABB
    4
    20A
    Type C
    690V
    S804N
    36 kA
    -
    -
    36 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    HK$1,196.00
    Siemens
    3+N
    13A
    Type C
    400V
    5SY6
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SY6613-7
    Extended product life
    Yes
    -
    • RS庫存編號 535-4346
    • 製造零件編號 2CDS273001R0504 S203M-C50
    HK$837.50
    ABB
    3
    50A
    Type C
    440V
    S200M
    10 kA
    12V
    System Pro M Compact
    10 kA
    DIN Rail Mount
    MCB
    88mm
    52.5mm
    69mm
    S203M-C50
    -
    -
    -
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