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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$1,475.30
    Siemens
    3+N
    20A
    Type B
    400V
    5SY7
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SY7620
    Extended product life
    Yes
    -
    HK$6,136.48
    ABB
    4
    16A
    Type Z
    400V
    S200 M UC
    10 kA
    440V
    System Pro M Compact
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 212-8940
    • 製造零件編號 5SL6505-7
    HK$482.20
    Siemens
    1+N
    500mA
    Type C
    230V
    5SL6
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SL6505-7
    Extended product life
    Yes
    -
    Better World
    HK$449.70
    Siemens
    1
    13A
    Type D
    400V
    5SY4
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    18mm
    76mm
    5SY4113-8
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 213-1052
    • 製造零件編號 5SL6504-7
    HK$478.80
    Siemens
    1+N
    4A
    Type C
    230V
    5SL6
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SL6504-7
    Extended product life
    Yes
    -
    Better World
    HK$514.00
    Siemens
    1+N
    300mA
    Type C
    230V
    5SY6
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SY6514-7
    Extended product life
    Yes
    -
    • RS庫存編號 825-5895
    • 製造零件編號 P1MB3PD50
    HK$734.10
    Lovato
    3
    50A
    Type D
    230 V, 400V
    P1MB
    10 kA
    -
    ModuLo
    10 kA
    DIN Rail Mount
    MCB
    86.5mm
    54mm
    80mm
    -
    -
    -
    -
    Better World
    HK$1,527.90
    Siemens
    2
    25A
    Type C
    400V
    5SY5
    10 kA
    440V
    SENTRON
    10 kA
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SY5225-7
    Extended product life
    Yes
    -
    • RS庫存編號 203-068
    • 製造零件編號 2CDS383001R0321
    HK$3,006.68
    ABB
    3
    32A
    Type D
    415V
    S303
    100 kA
    125V
    -
    100 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$4,183.28
    ABB
    3
    50A
    Type K
    400V
    S200M
    15 kA
    125V
    System Pro M Compact
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 216-6012
    • 製造零件編號 5SL6340-6
    HK$720.30
    Siemens
    3
    40A
    Type B
    -
    5SL6
    -
    -
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    54mm
    76mm
    5SL6340
    Extended product life
    Yes
    -
    HK$1,323.98
    ABB
    1+N
    1.6A
    Type C
    230V
    S200M
    15 kA
    60V
    System Pro M Compact
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 203-865
    • 製造零件編號 2CDS272337R0277
    HK$2,332.08
    ABB
    2
    2A
    Type K
    440V
    SU200 M
    15 kA
    96V
    -
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    • RS庫存編號 212-8938
    • 製造零件編號 5SL6413-7
    HK$1,126.60
    Siemens
    3+N
    13A
    Type C
    400V
    5SL6
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SL6413-7
    Extended product life
    Yes
    -
    Better World
    HK$1,475.30
    Siemens
    3+N
    25A
    Type B
    400V
    5SY7
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SY7625-6
    Extended product life
    Yes
    -
    • RS庫存編號 825-5876
    • 製造零件編號 P1MB3PD04
    HK$667.40
    Lovato
    3
    4A
    Type D
    230 V, 400V
    P1MB
    10 kA
    -
    ModuLo
    10 kA
    DIN Rail Mount
    MCB
    86.5mm
    54mm
    80mm
    -
    -
    -
    -
    • RS庫存編號 140-652
    • 製造零件編號 2CCS884001R0597
    HK$6,529.06
    ABB
    4
    63A
    Type K
    415V
    S804C
    25 kA
    -
    -
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Better World
    HK$502.20
    Siemens
    1+N
    16A
    Type C
    230V
    5SY8
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SY8516-7
    Extended product life
    Yes
    -
    Better World
    HK$1,551.60
    Siemens
    4
    10A
    Type B
    400V
    5SY7
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SY7410
    Extended product life
    Yes
    -
    Better World
    HK$1,288.40
    Siemens
    3+N
    1.6A
    Type C
    400V
    5SY4
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SY4615-7
    Extended product life
    Yes
    -
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