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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

    HK$4,255.40
    ABB
    2
    63A
    Type Z
    400V
    S200 M UC
    10 kA
    440V
    System Pro M Compact
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$3,240.93
    ABB
    3
    50A
    Type Z
    400V
    S200
    10 kA
    110V
    System Pro M Compact
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$6,127.53
    ABB
    3+N
    40A
    Type C
    415V
    S300P
    25 kA
    -
    System Pro M Compact
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$2,102.77
    ABB
    1+N
    500mA
    Type D
    240V
    S300P
    100 kA
    72V
    System Pro M Compact
    100 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$2,235.98
    ABB
    1+N
    40A
    Type K
    240V
    S300P
    25 kA
    72V
    System Pro M Compact
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 203-670
    • 製造零件編號 2CDS381103R0157
    HK$2,102.77
    ABB
    1+N
    500mA
    Type K
    415V
    S301
    100 kA
    125V
    -
    100 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$3,241.79
    ABB
    2
    6A
    Type K
    400V
    SU200 MR
    15 kA
    -
    System Pro M Compact
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 204-274
    • 製造零件編號 2CDS383001R0407
    HK$3,520.48
    ABB
    3
    8A
    Type K
    415V
    S303
    100 kA
    125V
    -
    100 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 203-652
    • 製造零件編號 2CDS274337R0154
    HK$3,446.45
    ABB
    4
    15A
    Type C
    480V
    SU200 M
    15 kA
    -
    -
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 203-911
    • 製造零件編號 2CDS273337R0428
    HK$3,119.81
    ABB
    3
    10A
    Type Z
    400V
    SU200 M
    15 kA
    -
    -
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 203-659
    • 製造零件編號 2CDS274337R0457
    HK$4,006.11
    ABB
    4
    15A
    Type K
    480V
    SU200 M
    15 kA
    -
    -
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 203-654
    • 製造零件編號 2CDS274337R0317
    HK$4,662.06
    ABB
    4
    3A
    Type K
    480V
    SU200 M
    15 kA
    -
    -
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$6,260.74
    ABB
    3+N
    50A
    Type K
    415V
    S300P
    25 kA
    -
    System Pro M Compact
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$1,902.96
    ABB
    1+N
    3A
    Type C
    240V
    S300P
    100 kA
    72V
    System Pro M Compact
    100 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$2,521.42
    ABB
    2
    300mA
    Type K
    415V
    S300P
    100 kA
    125V
    System Pro M Compact
    100 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$1,798.30
    ABB
    1+N
    25A
    Type Z
    240V
    S300P
    25 kA
    72V
    System Pro M Compact
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$1,323.98
    ABB
    1+N
    1A
    Type C
    230V
    S200M
    15 kA
    60V
    System Pro M Compact
    15 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$4,804.97
    ABB
    3+N
    32A
    Type Z
    415V
    S300P
    25 kA
    -
    System Pro M Compact
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$968.99
    ABB
    1
    50A
    Type C
    230V
    S200 M UC
    10 kA
    220V
    System Pro M Compact
    10 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$1,712.66
    ABB
    1+N
    32A
    Type D
    240V
    S300P
    25 kA
    72V
    System Pro M Compact
    25 kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
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