Selection of household residual current circuit breakers

In home decoration, incorrect selection of residual current circuit breakers can often cause them to trip, mainly due to incorrect selection of residual current circuit breakers. Especially when carrying out circuit modifications, it is important to pay attention to the model of the residual current circuit breaker and replace it promptly if necessary.
General principle: All sockets should use residual current circuit breakers, and lighting fixtures generally do not use residual current circuit breakers.

A residual current circuit breaker, also known as a residual current protection device, is composed of an overcurrent residual current circuit breaker on the left side. Its function is to cut off the circuit when the load current exceeds the marked current, playing a protective role in the circuit; The one on the right is a leakage protector, also known as a zero position protector; Its function is to activate the relay inside the circuit (this circuit) when there is a leakage situation (i.e. when the sum of thermal power and zero electricity is not zero), which drives the overcurrent switch to operate and cuts off the power supply to provide protection. But it must be noted here that for a 1P leakage circuit breaker, the left side must be connected to a live wire, otherwise it will not provide protection in case of leakage because its neutral wire is normally connected and cannot be disconnected. So be sure to pay attention when using. If you are unable to distinguish between the live and neutral lines, use 2P insurance instead.

When selecting leakage circuit breakers, the following considerations should be taken:
1. Wire side: The current of the residual current circuit breaker should be less than the current carrying capacity of the wire. Otherwise, it is very likely that overload will not trip, which will not provide protection.
2. Main switch current: The current of the branch switch should be less than the main switch current to avoid exceeding the level of tripping.
3. Number of sockets: If there are too many sockets in the circuit, it should be considered to increase the current of the residual current circuit breaker and the wire width of the main circuit to avoid overload.
4. Level of leakage circuit breaker: In general, from an economic and safety perspective, a single pole leakage circuit breaker can be used for ordinary five hole socket circuits, while a two pole leakage circuit breaker is required for three hole socket circuits used in high-power appliances.
5. The protection function of residual current circuit breakers: All socket circuits must use residual current circuit breakers with residual current. It is not recommended to use residual current circuit breakers for light circuits and main switches to avoid misoperation.
The common selection of leakage circuit breakers is 1PC16 leakage circuit breaker, 1PC20 leakage circuit breaker, and 2PC32 leakage circuit breaker. The rated current of the leakage circuit breaker Cxx is xx amperes.
Generally speaking, the leakage circuit breaker current of the branch switch in the household distribution box should not exceed 32A, because the wires in the corridor are generally 6 square meters, and excessive current for a single user can easily cause a fire in the corridor.
6. The sockets in general kitchens must be equipped with residual current circuit breakers, because kitchens usually use electric rice cookers, range hoods, and intelligent electric oil fume check valves. Once they leak, they can pose a threat to human health.