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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
    • RS庫存編號 216-6025
    • 製造零件編號 5SY7532-6
    HK$610.00
    Siemens
    1+N
    32A
    Type B
    -
    5SY7
    5 kA
    -
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SY7532
    Extended product life
    Yes
    -
    • RS庫存編號 243-990
    • 製造零件編號 101264 PLI-D13/1
    HK$284.60
    Eaton
    1
    13A
    Type D
    230V
    Eaton Moeller Series
    10 kA
    -
    -
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 209-6453
    • 製造零件編號 5SL4110-8
    HK$274.00
    Siemens
    1
    10A
    Type D
    400V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    18mm
    76mm
    90mm
    5SL4110-8
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-6493
    • 製造零件編號 5SL4332-8
    HK$1,499.00
    Siemens
    3
    32A
    Type D
    400V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    54mm
    76mm
    90mm
    5SL4332-8
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-6472
    • 製造零件編號 5SL4215-8
    HK$875.00
    Siemens
    2
    1.6A
    Type D
    400V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    36mm
    76mm
    90mm
    5SL4215-8
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-6511
    • 製造零件編號 5SL4425-7
    HK$1,458.50
    Siemens
    3+N
    25A
    Type C
    400V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    72mm
    76mm
    90mm
    5SL4425-7
    Extended product life
    Yes
    -
    Better World
    HK$705.70
    Siemens
    1+N
    4A
    Type C
    230V
    5SY7
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SY7504-7
    Extended product life
    Yes
    -
    • RS庫存編號 240-571
    • 製造零件編號 102182 FAZ-D4/2-NA
    HK$1,562.52
    Eaton
    2
    4A
    Type D
    415V
    FAZ
    15 kA
    60V
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 209-6560
    • 製造零件編號 5SP4180-8
    HK$856.50
    Siemens
    1
    80A
    Type D
    400V
    5SP4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    27mm
    76mm
    90mm
    5SP4180-8
    -
    -
    -
    • RS庫存編號 243-527
    • 製造零件編號 102106 FAZ-D8/1-NA
    1 包 2 套
    HK$887.90
    Eaton
    1
    8A
    Type D
    240V
    FAZ
    15 kA
    60V
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 209-6505
    • 製造零件編號 5SL4410-8
    HK$1,539.30
    Siemens
    3+N
    10A
    Type D
    400V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    72mm
    76mm
    90mm
    5SL4410-8
    Extended product life
    Yes
    -
    • RS庫存編號 240-601
    • 製造零件編號 102282 FAZ-C4/3-RT
    HK$2,120.56
    Eaton
    3
    4A
    Type C
    415V
    FAZ
    15 kA
    60V
    xEffect
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 209-6538
    • 製造零件編號 5SL4603-8
    HK$1,604.30
    Siemens
    3+N
    3A
    Type D
    400V
    5SL4
    10 kA
    -
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    72mm
    76mm
    90mm
    5SL4603-8
    Extended product life
    Yes
    -
    Better World
    HK$1,448.80
    Siemens
    3+N
    25A
    Type D
    400V
    5SY4
    10 kA
    72V
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    72mm
    76mm
    90mm
    5SY4625-8
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 209-6651
    • 製造零件編號 5SL4615-7
    HK$1,410.90
    Siemens
    3+N
    1.6A
    Type C
    400V
    5SL4
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SL4615-7
    Extended product life
    Yes
    -
    • RS庫存編號 140-490
    • 製造零件編號 2CCS862017R0707
    HK$5,261.30
    ABB
    2
    70A
    Type K
    240V
    S800U
    50 kA
    -
    -
    50 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 140-457
    • 製造零件編號 2CCS861001R1325
    HK$2,247.02
    ABB
    1
    32A
    UC-B
    -
    S801S
    50 kA
    250V
    -
    50 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 212-8882
    • 製造零件編號 5SP4192-7
    HK$847.80
    Siemens
    1
    125A
    Type C
    400V
    5SP4
    -
    -
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    27mm
    76mm
    5SP4192-7
    -
    -
    -
    Better World
    HK$837.00
    Siemens
    1+N
    10A
    Type C
    230V
    5SY8
    25 kA
    72V
    SENTRON
    25 kA
    DIN Rail Mount
    MCB
    36mm
    76mm
    90mm
    5SY8510-7
    Extended product life
    Yes
    -
    • RS庫存編號 227-0678
    • 製造零件編號 239083 FAZ6-C50/1N
    HK$533.56
    Eaton
    1+N
    50A
    Type C
    -
    -
    -
    -
    xEffect
    -
    DIN Rail Mount
    -
    -
    -
    -
    FAZ6-C50/1N
    -
    -
    -
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