As far as miniature circuit breakers are concerned, 1P+N, 1P, and 2P are generally used as the on-off control of single-phase electrical appliances, but the functions are different. In order to facilitate the user's selection and difference, the difference of the P number of circuit breakers and the selection method are briefly analyzed.
1P: Single-pole circuit breaker, with thermal-magnetic tripping function, only control the front (phase line), module 18mm;
1P+N: Unipolar +N circuit breaker, which controls the front and neutral line at the same time, but only the front has the function of thermal and magnetic tripping.
When the N line is a non-maintenance pole or an open and closed neutral pole, the modulus is 2*18mm=36mm;
When the N line is not able to break the neutral wire, the modulus is 18mm. That is, a circuit breaker with residual current maintenance at one pole
2P: single-phase 2-pole circuit breaker, which controls the front and neutral line at the same time, and has the function of thermal and magnetic tripping, with a modulus of 2*18mm=36mm.
Therefore, the following conclusions can be drawn:
1. In order to reduce the cost, 1P can be used, but the superior circuit breaker must have the function of leakage tripping, and it is necessary to cut off the superior power supply in order to prevent fire and zero disorder during maintenance;
2. In order to prevent the problem of 1 during maintenance, 1P+N (such as Schneider's DPN) can be used;
3. The reason for using 2P: for the same 18mm modulus circuit breaker shell, there is a difference between the internal installation of 1P and the installation of 1P+N, and the "ultimate breaking capacity" of the former in the state of short circuit incident is definitely higher than that of the latter, after all, space is an important factor affecting the breaking ability. Therefore, for the more important, frequent maintenance and operation, and simple failure of the power circuit, it is best to use 2P (but the cost will be a little higher).
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