MCCBs | Moulded Case Circuit Breakers | RS
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    MCCBs

    Molded Case Circuit Breakers (MCCBs) are protective devices used to interrupt and protect electrical circuits from overcurrent and short-circuits. MCCBs are electrical devices that can be used to protect a wide range of electrical systems and equipment.

    They are commonly used in low and medium-voltage applications and can handle higher levels of current than Miniature Circuit Breakers (MCBs). MCCBs typically have a rated current of 10 amps to 2,500 amps, and a breaking capacity of up to 200 kA.

    How does an MCCB work?

    An MCCB consists of a current-carrying bimetallic strip, a magnetic trip element, and a mechanical latching mechanism. When the current flowing through the MCCB exceeds the set limit, the bimetallic strip heats up and bends, causing the latch to release and trip the breaker. The magnetic trip element senses the magnetic field produced by a high fault current and trips the breaker.

    Difference between an MCB and an MCCB

    MCBs are miniature circuit breakers designed to protect low-current circuits up to 125 amps. They typically have a breaking capacity of up to 10 kA and are designed to trip quickly in the event of a short circuit or overload. MCBs are commonly used in residential and commercial buildings to protect individual circuits, such as lighting and power circuits.

    MCCBs, on the other hand, are designed to handle higher levels of current (depending on which current rating you buy) and can protect larger electrical systems and equipment. They have a higher breaking capacity than MCBs.

    Typical applications

    MCCBs are commonly used in a wide range of applications, including:

    • Industrial plants: MCCBs are used to protect motors, transformers, and other equipment in industrial plants.
    • Data centres: MCCBs are used to protect power distribution systems in data centres.
    • Commercial buildings: MCCBs are used to protect lighting and power circuits in commercial buildings.
    • Hospitals: MCCBs are used to protect critical equipment in hospitals, such as MRI machines and X-ray machines.

    8981 Products showing for MCCBs

    ABB
    XT4S
    1SDA06
    3
    10A
    -
    -
    -
    Fixed
    -
    -
    -
    Designed for disassembly
    Yes
    -
    Siemens
    SENTRON
    3VA1
    3
    125A
    70 kA
    690V
    500V
    -
    76.2mm
    70mm
    130mm
    Extended product life, Saves energy
    Yes
    -
    Schneider Electric
    ComPacT
    NSX100
    4
    250A
    -
    -
    -
    Fixed
    -
    -
    -
    -
    -
    -
    ABB
    XT4L
    1SDA06
    3
    40A
    -
    -
    -
    Fixed
    -
    -
    -
    Designed for disassembly
    Yes
    -
    Siemens
    SENTRON
    3VA1
    2P
    125A
    -
    -
    -
    DIN Rail Mount
    -
    -
    -
    Extended product life, Saves energy
    Yes
    -
    ABB
    -
    1SDA05
    3
    400A
    -
    -
    -
    Fixed
    -
    -
    -
    -
    -
    -
    Siemens
    Sentron
    3VA2
    3P
    630A
    150 kA
    690V
    -
    DIN Rail Mount
    138mm
    110mm
    248mm
    Extended product life
    Yes
    -
    Schneider Electric
    Compact
    NSX HB2
    3
    250A
    100 kA
    690V
    -
    Fixed
    -
    -
    -
    -
    Yes
    Green Premium
    Siemens
    SENTRON
    3VA1
    3P
    320A
    -
    -
    -
    DIN Rail Mount
    -
    -
    -
    Extended product life, Saves energy
    Yes
    -
    Siemens
    SENTRON
    3VA1
    4P
    250A
    -
    -
    -
    DIN Rail Mount
    -
    -
    -
    Extended product life, Saves energy
    Yes
    -
    Schneider Electric
    ComPacT New generation
    C25H47
    4
    250A
    440 V
    -
    -
    Fixed
    -
    -
    -
    -
    -
    -
    Schneider Electric
    ComPact
    LV42
    -
    -
    -
    -
    -
    Fixed
    -
    -
    -
    -
    Yes
    Green Premium
    Schneider Electric
    Compact
    NSXm
    4
    160A
    -
    690V
    -
    Clip-On
    108mm
    137mm
    80mm
    -
    Yes
    Green Premium
    Schneider Electric
    ComPacT
    NSX
    3
    400A
    85 kA
    690V
    -
    Fixed
    255mm
    140mm
    110mm
    -
    -
    -
    Schneider Electric
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Siemens
    SENTRON
    3VA2
    3
    40A
    2.5 kA
    -
    -
    Fixed
    -
    -
    -
    Extended product life
    Yes
    -
    Siemens
    SENTRON
    3VA2
    4P
    250A
    -
    -
    -
    DIN Rail Mount
    -
    -
    -
    Extended product life
    Yes
    -
    Schneider Electric
    ComPacT NSX
    ComPacT NSX160F
    3
    160A
    -
    -
    -
    Fixed
    -
    -
    -
    -
    Yes
    Green Premium
    Schneider Electric
    ComPacT NSX
    ComPacT NSXmB
    3
    100A
    -
    -
    -
    Fixed
    -
    -
    -
    -
    Yes
    Green Premium
    Schneider Electric
    ComPacT
    NSX
    4
    600A
    -
    -
    -
    Fixed
    -
    -
    -
    -
    -
    -
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