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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 247-667
    • 製造零件編號 132761 FAZ-B15/2-RT
    HK$1,004.48
    Eaton
    2
    15A
    Type B
    415V
    FAZ
    15 kA
    60V
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 247-659
    • 製造零件編號 132733 FAZ-B2/1-RT
    HK$343.20
    Eaton
    1
    2A
    Type B
    240V
    FAZ
    15 kA
    60V
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$4,481.47
    ABB
    3+N
    20A
    Type Z
    415V
    S300P
    25 kA
    -
    System Pro M Compact
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 247-658
    • 製造零件編號 132730 FAZ-B40/3-NA
    HK$1,850.84
    Eaton
    3
    40A
    Type B
    415V
    FAZ
    15 kA
    60V
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 248-714
    • 製造零件編號 102316 FAZ-D40/3-RT
    HK$3,022.73
    Eaton
    3
    40A
    Type D
    415V
    FAZ
    15 kA
    60V
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 224-7846
    • 製造零件編號 3VA1132-5GF42-0AA0
    HK$4,410.80
    Siemens
    4
    32A
    -
    -
    3VA1
    -
    -
    SENTRON
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    Extended product life, Saves energy
    Yes
    -
    • RS庫存編號 247-900
    • 製造零件編號 132785 FAZ-B32/3-RT
    HK$1,720.63
    Eaton
    3
    32A
    Type B
    415V
    FAZ
    15 kA
    60V
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 252-937
    • 製造零件編號 211812 AZ-4-C125
    HK$5,785.04
    Eaton
    4
    125A
    Type C
    400V
    -
    20 kA
    60V
    xEffect
    20 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$5,027.40
    Siemens
    3
    63A
    Type D
    400V
    5SJ4363
    10 kA
    60V
    SENTRON
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$799.00
    Siemens
    1
    35A
    Type C
    400V
    5SJ4135
    14 kA
    60V
    SENTRON
    14 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 248-607
    • 製造零件編號 102151 FAZ-D20/1-RT
    HK$653.84
    Eaton
    1
    20A
    Type D
    240V
    FAZ
    15 kA
    60V
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 247-891
    • 製造零件編號 132759 FAZ-B10/2-RT
    HK$1,004.48
    Eaton
    2
    10A
    Type B
    415V
    FAZ
    15 kA
    60V
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 248-582
    • 製造零件編號 101266 PLI-B2/1N
    HK$514.33
    Eaton
    1
    2A
    Type B
    230V
    Eaton Moeller Series
    10 kA
    -
    -
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 248-622
    • 製造零件編號 102228 FAZ-D13/2-RT
    HK$1,478.81
    Eaton
    2
    13A
    Type D
    415V
    FAZ
    15 kA
    60V
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 247-983
    • 製造零件編號 102313 FAZ-D30/3-RT
    HK$2,241.47
    Eaton
    3
    30A
    Type D
    415V
    FAZ
    15 kA
    60V
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$568.70
    Siemens
    1
    5A
    Type D
    400V
    5SJ4111
    10 kA
    60V
    SENTRON
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$861.30
    Siemens
    1
    63A
    Type B
    400V
    5SJ4163
    14 kA
    60V
    SENTRON
    14 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 224-7832
    • 製造零件編號 3VA1125-4ED26-0AA0
    HK$2,593.10
    Siemens
    2
    25A
    -
    -
    3VA1
    -
    -
    SENTRON
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    Extended product life, Saves energy
    Yes
    -
    • RS庫存編號 248-581
    • 製造零件編號 101263 PLI-D10/1
    HK$284.60
    Eaton
    1
    10A
    Type D
    230V
    Eaton Moeller Series
    10 kA
    -
    -
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$1,564.50
    Siemens
    2
    8A
    Type D
    400V
    5SJ4208
    14 kA
    60V
    SENTRON
    14 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
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