What is 1P, 1P+N, 2P of Miniature Circuit Breaker and how to choose it?
As we know, Miniature Circuit Breaker poles have 1P, 2P, 3P, 4P and 1P+N normally.
For miniature circuit breakers, 1P+N, 1P, 2P are generally used as a single phase switching control of electrical appliances, but the effect is different.
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| 1P+N |
1P+N--single pole + N circuit breaker, and the control of phase line, neutral line, but only phase line with thermal magnetic trip function, modules the same as 18mm;
2P--single phase 2 pole circuit breaker, and the control of phase line, neutral line, and has the thermal magnetic tripping function, 2* 18mm = 36mm modules. More information and products you can find in www.cngivsens.com
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| 2P |
So we can draw the following conclusions:
1. In order to reduce the cost, 1P is ok, but higher breaker must have leakage tripping function and maintenance to prevent phase line and neutral line in confusion caused by the accident, must cut off the higher power;
2. In order to avoid the problem of first 1, can be used 1P+N (that is DPN good enough);
3. Use 2P reason: for the same is 18mm module of the circuit breaker shell, inside 1P and 1P+N is differentiated, the former in the short circuit accident "limit breaking capacity" will certainly be higher than the latter. After all, space is impact breaking capacity of an important factor. Therefore, for more important, maintenance and operation of frequent, prone to failure of the electrical circuit, it is best to use the 2P (the cost is higher than 1P+N).
4. 1P is a prerequisite for lighting distribution box must be the function of leakage trip, at least in line (or outlet on a level) to leakage circuit breaker.
Hope it could help you
