You must know some of the circuit breaker knowledge and case!

Update date:2017-10-20 Source:MAXGE

What is the difference between small circuit breakers 1P, 1P+ N, and 2P?


For miniature circuit breakers, 1P+ N, 1P and 2P are commonly used as single-phase electrical control, but the effect is different.

1P--- single-pole circuit breaker, with thermal magnetic tripping function, only control the fire line (phase line), module 18mm;

1P+N- single pole +N circuit breaker, and control the fire line and zero line, but only the hot line has the function of thermal magnetic tripping. The modulus is also 18mm;

2P- a single phase 2 pole circuit breaker, which controls both the fire line and the zero line, and both of them have the function of thermal magnetic tripping, and the modulus is 2*18mm= 36mm.


Therefore, the following conclusions can be drawn:

1. In order to reduce costs, it is possible to use 1P, but the superior circuit breaker must have a leak-off function. In order to prevent the accident from fire and zero disturbance, the superior power supply must be cut off.

2. To avoid 1 problem for maintenance, 1P+N (DPN) can be used.

3, with the reason of 2 p: for the same 18 mm module circuit breaker shell, internal with the 1 p and 1 p + N installed, there is a difference between the former in short circuit accident situation "extreme breaking ability" must be higher than the latter, after all, space is an important factor affect the ability of the breaking. Therefore, it is better to use 2P (higher cost) for the more important, maintenance and operation of the power circuits that are prone to failure.

4. The lighting distribution box must have the function of leakage, at least the incoming line (or at the top of the line) should be used with leakage circuit breaker.


A detailed explanation of circuit breakers 1P, 1P+ N, 2P, 3P, 3P+ N, 4P!

Answer: 1P, 2P, 3P and 4P are poles, indicating that several lines can be segmented. Now + N, it's all N line breaks, but the N line doesn't have a tripping device. It's just a line break and the N line is cut off. For example, the 4P 16A circuit breaker, if N line current is greater than 16A, or is greater than 20A, theoretically, the circuit breaker will jump. But the 3P+N circuit breaker, N line current 160A, doesn't jump. The premise is that phase line current does not exceed the rating.

What are the appliances for 1P, 2P and 3P? What's the difference between them?

Answer: 1P, 2P single phase equipment, lighting can use 1P, the socket wants 2P; 3P is used on three-phase equipment, and the third phase is the third phase.


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