The selection of internal circuit breakers in household meter boxes is crucial as it relates to the safety and stability of household circuits. When choosing a circuit breaker, the following key factors need to be considered:

Polarity: Household circuit breakers generally use 1P or 2P. A 1P circuit breaker can only disconnect the live wire, while a 2P circuit breaker can disconnect both the live and neutral wires simultaneously, providing higher safety. Therefore, it is recommended to use 2P circuit breakers for the main switch and three socket circuits, and 1P circuit breakers for the rest.

Function: Household circuit breakers usually have leakage protection function to prevent electric shock accidents caused by leakage. All socket circuits, whether they are five pin sockets or three pin sockets, should be equipped with circuit breakers with leakage protection function. However, the lighting circuit and main switch do not require installation of leakage protection.

Current: The rated current of the circuit breaker should be selected according to the household electricity demand. The main switch usually uses a 32A circuit breaker, the lighting circuit uses a 16A circuit breaker, the five pin socket circuit uses a 16A residual current circuit breaker, and the three pin socket uses a 20A residual current circuit breaker. Choosing the appropriate rated current can ensure circuit safety and avoid frequent tripping.

In addition, when choosing a circuit breaker, attention should also be paid to its brand and quality. High quality branded circuit breakers provide greater assurance in terms of safety, durability, and stability. At the same time, the use of circuit breakers should be regularly checked to ensure their normal operation.

In summary, the selection of internal circuit breakers for household electricity meter boxes should take into account factors such as pole number, function, and current to ensure the safety and stability of household circuits.