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Select Protection Devices

K M Thilakarathne

There are 2 devices in the market as a  RCD or  RCCB are installed for electrical circuit SELECT PROTECTION DIVICEs  for earth leakage protection  - what is the difference of its and what is most suitable for the human protection device 

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    RCCB stands for Residual Current Circuit Breaker and may also be called RCB or RCD.
    RCD stands for Residual Current Device, while
    RCB stands for Residual Current Breaker. 

    Whatever you call it, the device  disconnects the circuit as soon as it detects a current leak, either  to the earth wire or  by direct contact from a live part to something or someone directly on the ground

    This protection is achieved by monitoring the current flow in the line(s) and neutral. In a healthy circuit, the current flow via the line equals the return flow in the neutral.

    However, this return flow may not be equal to the line(s) current flow in the event of any abnormalities. A residual current device will sense the imbalance and interrupt the circuit.

    For safety of life a threshold of  less than 30mA is considered as the requirement, higher values, like 300mA or 100mA or slower operations, can serve a protective function but may not be sensitive or fast enough to prevent an electrocution.

    Hope that helps
    Mike.

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  • 0

    RCCB stands for Residual Current Circuit Breaker and may also be called RCB or RCD.
    RCD stands for Residual Current Device, while
    RCB stands for Residual Current Breaker. 

    Whatever you call it, the device  disconnects the circuit as soon as it detects a current leak, either  to the earth wire or  by direct contact from a live part to something or someone directly on the ground

    This protection is achieved by monitoring the current flow in the line(s) and neutral. In a healthy circuit, the current flow via the line equals the return flow in the neutral.

    However, this return flow may not be equal to the line(s) current flow in the event of any abnormalities. A residual current device will sense the imbalance and interrupt the circuit.

    For safety of life a threshold of  less than 30mA is considered as the requirement, higher values, like 300mA or 100mA or slower operations, can serve a protective function but may not be sensitive or fast enough to prevent an electrocution.

    Hope that helps
    Mike.

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