In fact, not only the home distribution box, all the single-phase circuit, there are only these kinds of switches. By the way, it is not actually called a switch, the scientific name is called "circuit breaker" or "air switch", more professional name, called "miniature circuit breaker", short for "MCB".

Below we from the following several aspects, a brief description of the distribution box in several kinds of household circuit breaker.

The electric leakage circuit breaker and the household circuit breaker without leakage. The appearance of the difference is that the leakage circuit breaker in addition to the operating handle, there are some leakage accessories; no leakage circuit breaker, only the operating handle.

The difference between them, already reflected in the name, is the "leakage protection" function. Circuit breaker has overload protection and short circuit protection function whether or not it has leakage protection function.

In use, the household circuit breaker which can control the socket must have the function of leakage protection.

1 poles and 2 poles. The difference in appearance is the width of the 2P chint circuit breaker, twice the width of the 1P chint circuit breaker. The appearance of the leakage accessories of the leakage circuit breaker is the same as that of the 2P chint circuit breaker.

The main difference between them lies in the detection and control of the zero line. 1P circuit breaker, when disconnected, can only break the fire line, because in the normal condition of the circuit, the zero line is not charged, so the zero line always connected does not matter. But once the circuit fails, leading to zero line live, and then use 1P circuit breaker to disconnect the circuit, there is a security risk.

And when the 1P circuit breaker detects the overload and short circuit fault of the circuit, it can only detect the fire line, but can not detect the fault of the zero line.

2P circuit breaker makes up for these two points. It can not only disconnect the zero-fire line, but also detect the zero-fire line at the same time.

The number of poles of the circuit breaker does not affect any function related to leakage protection.

Between 1P and 2P, there is another product, but less used in home circuits. It is a 1P + N circuit breaker which can disconnect the zero line when it is disconnected. But when the circuit fault is detected, the zero line can not be detected.

In terms of model, DZ47 is commonly used in household circuit breakers, which is the same for all circuit breakers. The rated current parameters are different.

According to the actual number of loads in the circuit, the current division is very detailed. However, in the home circuit, the rated current of the circuit breaker is generally between 16A and 63A.

The general family circuit breakers have 2P 32A circuit breaker (main switch), 1P 16A circuit breaker (light switch), 1P 20A leakage circuit breaker (five hole socket switch), 2P 20A leakage circuit breaker (three hole socket switch).