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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

    Better World
    HK$1,970.10
    Schneider Electric
    2
    1A
    Type C
    -
    iC60L
    15 kA
    -
    Acti 9
    15 kA
    DIN Rail Mount
    MCB
    85mm
    36mm
    78.5mm
    A9F94201
    -
    Yes
    Green Premium
    Better World
    • RS庫存編號 219-9141
    • 製造零件編號 M9F22450
    HK$3,927.20
    Schneider Electric
    4
    50A
    Type C
    -
    -
    10 kA
    -
    Multi 9
    10 kA
    DIN Rail Mount
    MCB
    81mm
    72mm
    72mm
    C60SP
    -
    Yes
    Green Premium
    Better World
    • RS庫存編號 237-3253
    • 製造零件編號 2CDS253103R0021
    HK$2,199.78
    ABB
    3+N
    2A
    Type D
    -
    S200
    -
    -
    System Pro M Compact
    -
    DIN Rail Mount
    -
    -
    -
    -
    S203-D2NA
    Designed for disassembly
    Yes
    -
    HK$1,415.10
    Siemens
    2
    25A
    Type C
    400V
    5SJ4225
    10 kA
    60V
    SENTRON
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$299.51
    Schneider Electric
    1
    50A
    Type C
    415V
    SE10
    10000 A
    -
    Acti9
    10000 A
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$1,608.40
    Siemens
    2
    2A
    Type D
    400V
    5SJ4202
    10 kA
    60V
    SENTRON
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$1,608.40
    Siemens
    2
    5A
    Type D
    400V
    5SJ4211
    10 kA
    60V
    SENTRON
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$726.00
    Siemens
    1
    50A
    Type B
    400V
    5SJ4150
    14 kA
    60V
    SENTRON
    14 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$1,608.40
    Siemens
    2
    2A
    Type D
    400V
    5SJ4215
    10 kA
    60V
    SENTRON
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$3,154.30
    Schneider Electric
    2
    16A
    Type B
    230V
    A9C63
    10 kA
    48V
    Acti9
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 144-4702
    • 製造零件編號 NEN432
    HK$2,595.01
    Hager
    4
    32A
    Type B
    240 → 400V
    NEN
    10 kA
    -
    -
    10 kA
    DIN Rail Mount
    MCB
    83mm
    70mm
    70mm
    -
    -
    -
    -
    HK$297.63
    Schneider Electric
    1
    50A
    Type B
    240V
    SE10
    10000 A
    -
    Acti9
    10000 A
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$1,300.67
    Schneider Electric
    3
    50A
    Type D
    415V
    SE10
    10000 A
    -
    Acti9
    10000 A
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$1,852.91
    ABB
    2
    40A
    Type Z
    400V
    S200
    10 kA
    125V
    System Pro M Compact
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$2,939.60
    ABB
    3
    500mA
    Type C
    400V
    S200M
    15 kA
    125V
    System Pro M Compact
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$4,850.93
    ABB
    4
    13A
    Type C
    400V
    S200 M UC
    10 kA
    440V
    System Pro M Compact
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$4,651.98
    ABB
    4
    1A
    Type D
    400V
    S200M
    15 kA
    125V
    System Pro M Compact
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 201-401
    • 製造零件編號 2CDS244701R0631
    HK$4,548.45
    ABB
    4
    63A
    Type D
    400V
    S204L
    6 kA
    -
    -
    6 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$4,448.93
    ABB
    3
    30A
    Type K
    400V
    S200 M UC
    10 kA
    440V
    System Pro M Compact
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$811.04
    ABB
    1
    1.6A
    Type C
    230V
    S200 M UC
    10 kA
    220V
    System Pro M Compact
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
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