Residual current operated circuit breakers for household and similar uses-Part 2 Circuit breakers with integral overcurrent protection(RCVOs) - IS 12640 (Part-2)
These devices are intended to protect people from indirect contact by connecting the exposed conductive parts of the installation to an appropriate earth electrode, as well as to protect the wiring installations of buildings and similar applications from overcurrents. They can be used to protect against fire hazards caused by a persistent earth fault current without requiring the overcurrent protective device to be activated. RCBOs with a rated residual operating current of less than 30 mA is also used as an additional safeguard if the protective means against electric shock fail.
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