What causes a RCBO to trip?

The reasons for tripping are mainly the following four points:

①, there is a leakage of electricity in the circuit. The so-called circuit leakage, that is, the leakage protection switch under the mouth of the circuit connected to a location of the insulation resistance value does not meet the requirements. Then the circuit is not connected to the load, the leakage protection switch may not trip. But as soon as the load is turned on, then the current of the circuit, in the process of forming a loop, will transmit current to other places along the wires where the insulation does not meet the requirements. This is the most common conductor leakage tripping.

②, There is a leakage of electricity in the load. The so-called load leakage situation, refers to the leakage protection switch under the mouth of the circuit connected to the electrical appliances have a leakage. Like we use at home leakage protection switch, the lower port is generally with the ordinary socket or some other household appliances, then we use these sockets, if the electrical appliances leakage, will also lead to leakage protection switch tripping. Because the working process of the load, the same is through the zero line and the fire line to form a working cycle current, if the detection of the zero sequence current is not consistent, it will also be tripped. This is also a very important leakage protection switch protection factor.

③, overload will also lead to earth leakage protection switch tripping. Because the leakage protection switch in addition to the function of leakage protection, it is overload protection. The so-called overload protection, is the leakage protection switch under the mouth of the working current is greater than the leakage protection switch rated current. For example, our leakage protection switch is 20A, if the load current reaches 25A, then there is an overload. Like our home at the same time when using multiple household appliances, if the leakage protection switch tripped, then it may be caused by overload.

④, short circuit caused by the leakage protection switch tripped. Leakage protection switch also has a very important function, is the short circuit protection function. The so-called short-circuit, is the entire circuit does not go through the load directly form a circuit. Then the instantaneous current is very large, then there is a short-circuit current, short-circuit current exceeds the rated short-circuit current of the earth leakage protection switch, the earth leakage protection switch also realizes the release of the whole circuit for protection. Otherwise, the circuit may catch fire. Therefore, short-circuit protection is a very important protection measure.