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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 246-2647
    • 製造零件編號 2CCS573001R0317
    HK$1,477.56
    ABB
    3
    3A
    Type K
    415V
    -
    -
    -
    SMISSLINE TP
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 769-4481
    • 製造零件編號 239085 FAZ6-B6/2
    HK$586.50
    Eaton
    2
    6A
    Type B
    230 → 400V
    -
    6 kA
    -
    xEffect
    6 kA
    DIN Rail Mount
    MCB
    80mm
    17.5mm
    62mm
    -
    -
    -
    -
    HK$1,177.51
    Legrand
    2
    40A
    Type C
    400V
    -
    10 kA
    -
    DX3
    10 kA
    DIN Rail Mount
    MCB
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 212-8933
    • 製造零件編號 5SL6210-6
    HK$418.40
    Siemens
    2
    10A
    Type B
    400V
    5SL6
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SL6210-6
    Extended product life
    Yes
    -
    HK$2,232.17
    Siemens
    4
    63A
    Type B
    440V
    5SL64
    6 kA
    62.5V
    SENTRON
    6 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 216-4335
    • 製造零件編號 5SY4610-6
    HK$1,417.20
    Siemens
    3+N
    10A
    Type B
    -
    5SY4
    -
    -
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SY4610-6
    Extended product life
    Yes
    -
    • RS庫存編號 769-4807
    • 製造零件編號 168067 FAZ6-D40/1
    HK$248.76
    Eaton
    1
    40A
    Type D
    230 → 400V
    -
    6 kA
    -
    xEffect
    6 kA
    DIN Rail Mount
    MCB
    80mm
    17.5mm
    62mm
    -
    -
    -
    -
    Better World
    HK$473.10
    Siemens
    1+N
    20A
    Type C
    230V
    5SY6
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SY6520-7
    Extended product life
    Yes
    -
    Better World
    HK$1,682.20
    Siemens
    4
    8A
    Type C
    400V
    5SY7
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SY7408-7
    Extended product life
    Yes
    -
    Better World
    HK$963.60
    Schneider Electric
    1
    25A
    Type D
    277V
    -
    -
    -
    Multi 9
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    -
    Yes
    Green Premium
    • RS庫存編號 200-158
    • 製造零件編號 2CDS272337R0607
    HK$3,720.10
    ABB
    2
    63A
    Type K
    440V
    SU200 M
    15 kA
    96V
    -
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 279-4275
    • 製造零件編號 789-804
    HK$446.70
    WAGO
    -
    16A
    -
    250V
    -
    250 V
    -
    -
    250 V
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 200-081
    • 製造零件編號 2CDS272337R0338
    HK$2,481.65
    ABB
    2
    4A
    Type Z
    440V
    SU200 M
    15 kA
    96V
    -
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 213-1058
    • 製造零件編號 5SL6604-7
    HK$1,165.20
    Siemens
    3+N
    4A
    Type C
    400V
    5SL6
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SL6604-7
    Extended product life
    Yes
    -
    HK$4,119.15
    ABB
    2
    80A
    Type C
    400V
    S200
    6 kA
    110V
    System Pro M Compact
    6 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 212-8945
    • 製造零件編號 5SL6516-6
    HK$253.70
    Siemens
    1+N
    16A
    Type B
    230V
    5SL6
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SL6516-6
    Extended product life
    Yes
    -
    HK$829.26
    Schneider Electric
    2
    20A
    Type C
    440V
    iC60H
    10 kA
    133V
    Acti 9
    10 kA
    DIN Rail Mount
    MCB
    36mm
    78.5mm
    91mm
    -
    -
    Yes
    Green Premium
    Better World
    HK$1,288.40
    Siemens
    3+N
    1.6A
    Type C
    400V
    5SY4
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SY4615-7
    Extended product life
    Yes
    -
    HK$2,025.28
    Schneider Electric
    4
    20A
    -
    440V
    A9F76
    6000 A
    250V
    Acti9
    6000 A
    -
    MCB
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 216-5925
    • 製造零件編號 5SL6415-7
    HK$1,280.90
    Siemens
    3+N
    1.3A
    Type C
    -
    5SL6
    -
    -
    SENTRON
    -
    DIN Rail Mount
    -
    -
    -
    -
    5SL6415-7
    Extended product life
    Yes
    -
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