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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 212-8941
    • 製造零件編號 5SL6506-7
    HK$394.40
    Siemens
    1+N
    6A
    Type C
    230V
    5SL6
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SL6506-7
    Extended product life
    Yes
    -
    HK$2,666.49
    Schneider Electric
    4
    4A
    Type C
    400V
    IC60L
    20 kA, 15 kA
    250V
    Acti 9
    20 kA, 15 kA
    DIN Rail Mount
    MCB
    85mm
    72mm
    78.5mm
    Acti 9 iC60
    -
    Yes
    Green Premium
    Better World
    HK$1,080.30
    Siemens
    3
    10A
    Type C
    400V
    5SY7
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    54mm
    76mm
    5SY7310-7
    Extended product life
    Yes
    -
    Better World
    HK$2,528.00
    Schneider Electric
    4
    63A
    Type B
    -
    C60N
    40 kA
    -
    Multi 9
    40 kA
    DIN Rail Mount
    MCB
    81mm
    72mm
    72mm
    -
    -
    Yes
    Green Premium
    Better World
    HK$1,767.30
    Siemens
    4
    32A
    Type C
    400V
    5SY6
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SY6432-7
    Extended product life
    Yes
    -
    Better World
    HK$434.80
    Siemens
    1
    5A
    Type C
    400V
    5SY4
    5 kA
    72V
    SENTRON
    5 kA
    DIN Rail Mount
    MCB
    90mm
    18mm
    76mm
    5SY4111-7
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 212-8947
    • 製造零件編號 5SL6616-7
    HK$852.90
    Siemens
    3+N
    16A
    Type C
    400V
    5SL6
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    72mm
    76mm
    5SL6616-7
    Extended product life
    Yes
    -
    Better World
    • RS庫存編號 213-1051
    • 製造零件編號 5SL6502-7
    HK$482.20
    Siemens
    1+N
    2A
    Type C
    230V
    5SL6
    -
    72V
    SENTRON
    -
    DIN Rail Mount
    MCB
    90mm
    36mm
    76mm
    5SL6502-7
    Extended product life
    Yes
    -
    Better World
    HK$245.10
    Schneider Electric
    1
    20A
    Type C
    -
    C60N
    10 kA
    -
    Multi 9
    10 kA
    DIN Rail Mount
    MCB
    81mm
    18mm
    72mm
    -
    -
    Yes
    Green Premium
    Better World
    HK$2,009.13
    Schneider Electric
    4
    32A
    Type B
    -
    C60N
    40 kA
    -
    Multi 9
    40 kA
    DIN Rail Mount
    MCB
    81mm
    72mm
    72mm
    -
    -
    Yes
    Green Premium
    Better World
    • RS庫存編號 124-3201
    • 製造零件編號 5SY4432-6
    HK$1,251.70
    Siemens
    4
    32A
    Type B
    400V
    5SY4
    10 kA
    -
    Sentron
    10 kA
    DIN Rail Mount
    MCB
    70.4mm
    76mm
    90mm
    -
    Extended product life
    Yes
    -
    HK$2,000.30
    ABB
    2
    80A
    Type D
    400 V, 690V
    S800S
    50 kA
    250V
    High Performance
    50 kA
    -
    MCB
    95mm
    53mm
    88.5mm
    S802P-D80
    -
    -
    -
    • RS庫存編號 124-3046
    • 製造零件編號 EMCH320 EMCH320
    HK$975.70
    Eaton
    3
    20A
    Type C
    230 V, 240V
    -
    10 kA
    48V
    MEMShield
    10 kA
    DIN Rail Mount
    MCB
    54mm
    75mm
    80mm
    -
    -
    -
    -
    • RS庫存編號 124-3032
    • 製造零件編號 EMCH110 EMCH110
    HK$331.00
    Eaton
    1
    10A
    Type C
    230 V, 240V
    -
    10 kA
    48V
    MEMShield
    10 kA
    DIN Rail Mount
    MCB
    18mm
    75mm
    80mm
    -
    -
    -
    -
    • RS庫存編號 490-107
    • 製造零件編號 236426 PXL-C16/3
    HK$303.50
    Eaton
    3
    16A
    Type C
    400V
    PXL, S200
    10 kA
    48V
    xPole
    10 kA
    DIN Rail Mount
    MCB
    52.5mm
    80mm
    60mm
    -
    -
    -
    -
    • RS庫存編號 124-3043
    • 製造零件編號 EMCH306 EMCH306
    HK$1,038.50
    Eaton
    3
    6A
    Type C
    230 V, 240V
    -
    10 kA
    48V
    MEMShield
    10 kA
    DIN Rail Mount
    MCB
    54mm
    75mm
    80mm
    -
    -
    -
    -
    • RS庫存編號 490-315
    • 製造零件編號 236429 PXL-C32/3
    HK$438.00
    Eaton
    3
    32A
    Type C
    400V
    PXL
    10 kA
    48V
    xPole
    10 kA
    DIN Rail Mount
    MCB
    52.5mm
    80mm
    60mm
    -
    -
    -
    -
    • RS庫存編號 435-302
    • 製造零件編號 2CCS893001R0635 S803N-B63
    HK$1,609.30
    ABB
    3
    63A
    Type B
    400 V, 690V
    S800N
    6 kA
    -
    High Performance
    6 kA
    -
    MCB
    -
    -
    88.5mm
    S803N-B63
    -
    -
    -
    • RS庫存編號 435-342
    • 製造零件編號 2CCG001226R0001
    HK$575.15
    ABB
    1
    80A
    Type C
    400 V, 690V
    S800N
    36 kA
    -
    High Performance
    36 kA
    DIN Rail Mount
    MCB
    82.5mm
    27mm
    82.5mm
    S801P-C80
    -
    -
    -
    • RS庫存編號 124-3050
    • 製造零件編號 EMCH363 EMCH363
    HK$1,199.10
    Eaton
    3
    63A
    Type C
    230 V, 240V
    -
    10 kA
    48V
    MEMShield
    10 kA
    DIN Rail Mount
    MCB
    54mm
    75mm
    80mm
    -
    -
    -
    -
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