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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 141-122
    • 製造零件編號 2CCS882001R0501
    HK$3,075.85
    ABB
    2
    50A
    Type D
    415V
    S802C
    25 kA
    -
    -
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 248-584
    • 製造零件編號 101272 PLI-B16/1N
    HK$435.27
    Eaton
    1
    16A
    Type B
    230V
    Eaton Moeller Series
    10 kA
    -
    -
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 141-214
    • 製造零件編號 2CCS862001R0201
    HK$3,851.78
    ABB
    2
    20A
    Type D
    240V
    S800S
    50 kA
    -
    -
    50 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 141-207
    • 製造零件編號 2CCS863001R1447
    HK$7,313.84
    ABB
    3
    13A
    UC-K
    -
    S803S
    50 kA
    750V
    -
    50 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 252-931
    • 製造零件編號 211800 AZ-2-C80
    HK$2,622.80
    Eaton
    2
    80A
    Type C
    400V
    -
    20 kA
    60V
    xEffect
    20 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 141-235
    • 製造零件編號 2CCS892001R0405
    HK$3,984.70
    ABB
    2
    40A
    Type B
    690V
    S802N
    36 kA
    -
    -
    36 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$1,869.44
    Siemens
    1P + N
    16A
    Type C
    230V
    5SL60
    6 kA
    -
    SENTRON
    6 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 746-7930
    • 製造零件編號 2CDS254001R0401 S204-D40
    HK$1,738.00
    ABB
    4
    40A
    Type D
    400V
    S200
    6 kA
    -
    System Pro M Compact
    6 kA
    DIN Rail Mount
    MCB
    -
    70mm
    69mm
    S204-D40
    Designed for disassembly
    Yes
    -
    Better World
    • RS庫存編號 746-7905
    • 製造零件編號 2CDS254001R0021 S204-D2
    HK$2,262.98
    ABB
    4
    2A
    Type D
    400V
    S200
    6 kA
    -
    System Pro M Compact
    6 kA
    DIN Rail Mount
    MCB
    -
    -
    69mm
    S204-D2
    Designed for disassembly
    Yes
    -
    Better World
    • RS庫存編號 216-4776
    • 製造零件編號 5SL6314-7
    HK$777.70
    Siemens
    3
    300mA
    Type C
    -
    5SL6
    -
    -
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    54mm
    76mm
    5SL6314-7
    Extended product life
    Yes
    -
    • RS庫存編號 184-9051
    • 製造零件編號 CPB1050C3
    HK$159.80
    Contactum
    3
    50A
    Type C
    415V
    -
    10 kA
    -
    -
    10 kA
    DIN Rail Mount
    MCB
    -
    -
    -
    CPB1050C3
    -
    -
    -
    • RS庫存編號 435-213
    • 製造零件編號 2CCS863001R0631 S803S-D63
    HK$2,467.95
    ABB
    3
    63A
    Type D
    400 V, 690V
    S800S
    50 kA
    250V
    High Performance
    50 kA
    DIN Rail Mount
    MCB
    82.5mm
    81mm
    82.5mm
    S803S-D63
    -
    -
    -
    HK$3,324.09
    ABB
    2
    50A
    Type K
    400V
    S200 M UC
    10 kA
    440V
    System Pro M Compact
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 216-4053
    • 製造零件編號 5SL6605-7
    HK$1,165.20
    Siemens
    3+N
    500mA
    Type C
    -
    5SL6
    -
    -
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    -
    Extended product life
    Yes
    -
    HK$1,084.30
    ABB
    1
    80A
    Type D
    400 V, 690V
    S800S
    50 kA
    250V
    High Performance
    50 kA
    DIN Rail Mount
    MCB
    -
    -
    88.5mm
    S801P-D80
    -
    -
    -
    HK$1,098.60
    Siemens
    1
    60A
    Type C
    400V
    5SJ4160
    10 kA
    60V
    SENTRON
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 191-9458
    • 製造零件編號 2CDS251001R0064 S201-C6
    HK$220.50
    ABB
    1
    6A
    Type C
    230 V, 400V
    S200
    20 kA
    72V
    System Pro M Compact
    20 kA
    DIN Rail Mount
    MCB
    17.5mm
    69mm
    88mm
    S201-C6
    -
    -
    -
    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 200-125
    • 製造零件編號 2CDS271337R0304
    HK$799.05
    ABB
    1
    30A
    Type C
    277V
    SU200 M
    15 kA
    48V
    -
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 224-7874
    • 製造零件編號 3VA1163-4ED26-0AA0
    HK$2,593.10
    Siemens
    2
    63A
    -
    -
    3VA1
    -
    -
    SENTRON
    -
    DIN Rail Mount
    -
    -
    -
    -
    -
    Extended product life, Saves energy
    Yes
    -
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