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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.

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    1420 産品
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    Number of Poles
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    Tripping Characteristics
    Rated AC Voltage
    Series
    Breaking Capacity at Maximum Voltage Rating
    Rated DC Voltage
    Range
    Breaking Capacity
    Mounting Style
    Circuit Breaker Type
    Length
    Width
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    Better World Verification
    產品詳述
    單價
    Brand
    Number of Poles
    Current Rating
    Tripping Characteristics
    Rated AC Voltage
    Series
    Breaking Capacity at Maximum Voltage Rating
    Rated DC Voltage
    Range
    Breaking Capacity
    Mounting Style
    Circuit Breaker Type
    Length
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    Better World
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    • 製造零件編號 A9P24720
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    3
    20A
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    -
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    -
    -
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    -
    Yes
    Green Premium
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    6A
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    6 kA
    250V
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    -
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    MCB
    -
    -
    85mm
    -
    -
    Yes
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    4A
    Type C
    400V
    A9F9
    20 kA, 15 kA
    180V
    Acti 9
    -
    DIN Rail Mount
    MCB
    85mm
    54mm
    78.5mm
    iC60L
    -
    Yes
    Green Premium
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    • 製造零件編號 A9P22320
    HK$892.00
    Schneider Electric
    3
    20A
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    -
    -
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    -
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    16A
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    72mm
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    Schneider Electric
    3
    16A
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    400V
    Acti9 iDT40N XA
    -
    -
    Acti 9
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    HK$1,718.30
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    2
    8A
    Type D
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    -
    -
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    -
    -
    -
    -
    -
    -
    Yes
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    20A
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    415V
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    10000 A
    -
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    -
    -
    -
    -
    -
    -
    -
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    Better World
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    • 製造零件編號 A9P34706
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    Schneider Electric
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    -
    -
    -
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    -
    Yes
    Green Premium
    Better World
    HK$1,472.47
    Schneider Electric
    2
    4A
    Type C
    -
    C60H-DC
    20 kA
    500V
    Acti 9
    -
    DIN Rail Mount
    MCB
    36mm
    -
    81mm
    -
    -
    Yes
    Green Premium
    HK$1,461.40
    Schneider Electric
    3
    16A
    Type C
    230V
    -
    7.5 kA
    -
    Acti 9
    -
    DIN Rail Mount
    Residential MCB
    85mm
    18mm
    74mm
    IDD40T XA
    -
    -
    -
    Better World
    HK$2,268.98
    Schneider Electric
    4
    4A
    Type D
    440 V, 12 → 133 V, 220 → 240 V, 380 → 415V
    iC60H
    10 kA
    220 → 250V
    Acti 9
    -
    DIN Rail Mount
    MCB
    72mm
    85mm
    78.5mm
    -
    -
    Yes
    Green Premium
    • RS庫存編號 247-1895
    • 製造零件編號 48300
    HK$197,656.40
    Schneider Electric
    3
    2.5kA
    -
    -
    -
    -
    -
    MASTERPACT NW
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    HK$175.40
    Schneider Electric
    1
    3A
    Type B
    415V
    C60SP
    20 kA
    60V
    Multi 9
    -
    DIN Rail Mount
    Residential MCB
    81mm
    18mm
    72mm
    M9F21103
    -
    Yes
    Green Premium
    Better World
    HK$1,162.70
    Schneider Electric
    2
    2A
    Type C
    12 → 60 V, 100 → 130 V, 220 → 240 V, 380 → 415 V, 400 V
    iC60N
    6 kA
    12 → 144V
    Acti 9
    -
    DIN Rail Mount
    MCB
    85mm
    36mm
    78.5mm
    A9F74202
    -
    Yes
    Green Premium
    Better World
    HK$560.50
    Schneider Electric
    3
    32A
    Type D
    440V
    C60SP
    15 kA
    -
    Multi 9
    -
    DIN Rail Mount
    Residential MCB
    81mm
    54mm
    72mm
    M9F23332
    -
    Yes
    Green Premium
    Better World
    HK$2,919.20
    Schneider Electric
    4
    16A
    Type D
    277V
    -
    -
    -
    Multi 9
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    -
    Yes
    Green Premium
    Better World
    HK$1,240.80
    Schneider Electric
    2
    32A
    Type C
    440V
    iC60H
    10 kA
    125V
    Acti 9
    -
    DIN Rail Mount
    MCB
    -
    78.5mm
    85mm
    -
    -
    Yes
    Green Premium
    N
    • RS庫存編號 357-153
    • 製造零件編號 R9ETC616
    HK$2,756.91
    Schneider Electric
    1
    16A
    -
    230V
    R9E
    -
    -
    Resi9
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
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