The Residual current circuit breaker with over-current protection (RCBO), is actually a kind of circuit breaker with a leakage protection function. The RCBO has the protection function against leakage, electric shock, overload, and short circuit, which can prevent the occurrence of electric shock accidents and avoid fire accidents caused by electric leakage. , Has an obvious effect. RCBOs are installed in our common household distribution boxes to ensure people’s personal safety.
RCBO is a low-voltage safety protection electrical appliance, which is an effective protection for direct and indirect contact electricity in the low-voltage power grid. The protection action current is determined by the maximum load current of the line in normal operation. The RCBO reflects the residual current of the system. During normal operation, the system The residual current is almost zero. In the event of leakage and electric shock, the circuit generates a residual current. This current is not enough for MCBs and Fuses to operate, while leakage protectors will operate reliably.
An RCD, or residual current device, is a life-saving device that is designed to prevent you from getting a fatal electric shock if you touch something live, such as a bare wire. It can also provide some protection against electrical fires. RCDs offer a level of personal protection that ordinary fuses and circuit-breakers cannot provide.
A Residual Current Circuit Breaker (RCCB) is an important safety measure when it comes to the protection of electrical circuits. It is a current sensing device, which can automatically measure and disconnect the circuit whenever a fault occurs in the connected circuit or the current exceeds the rated sensitivity.
The residual current circuit breaker (RCCB) with another appellation of Residual current device ( RCD) achieves the following protections:
protection for users against electric shocks by direct contacts (<30mA),
protection for users against electric shocks by indirect contacts (300 mA),
protection of the installations against fire risks (300 mA).
Usually, The RCCB/RCD should be associated with MCBs for the power distribution system. But the RCBO achieves the above-mentioned protections (with different settings) in addition to protection against short circuits and cable overload.