The circuit breakers that can be seen in the family are generally only 1P and 2P. 1P and 2P are also called level 1 and level 2. Each level corresponds to two upper and lower terminals, and the width of each level is 17.5 mm (for example, 2P circuit breaker) The width of the device is 17.5*2=35mm).

The biggest difference between 1P and 2P is that the 1P circuit breaker can only control the live wire, while the 2P circuit breaker can control the neutral wire and the live wire. That is, when the circuit breaker is disconnected, both the neutral and live wires of the 2P circuit breaker are disconnected, but the neutral wire of the 1P circuit breaker is still not disconnected.

It should be noted that the 1P circuit breaker with leakage current and the 2P circuit breaker without leakage are easy to be confused in appearance, and the connection methods of the two are almost the same. The 1P circuit breaker with leakage current also has 4 terminals, but they are different Yes, when the 1P circuit breaker is disconnected, although the neutral wire is connected to the circuit breaker, the neutral wire cannot be disconnected.