Leakage circuit breaker model in the series, country hair electrical switch factory, www.guofadq.com 15957745520
Then we introduce the series P and N have what meaning. According to the individual's understanding and some online data, from two aspects to carry on the discussion:
A: from product classification
1P, 2P, 1P+N, 3P, 4P, 4P+N, P is installed to protect polar ( knife pole), N means a neutral line only provided with cutter pole, without a protection module. 2P and 1P+N are bipolar switch, while 4P and 3P+N are called 4-poles switch, 1P+N, 3P+N because of the neutral line without a protection, so cheap, neutral line cutter pole with phase knife pole move together. Some products have the 1P+N divided into two kinds: one with two module width, a only a module width ( smaller ).
1P pole switch
2P bipolar switch
3P - pole switch
4P - four-pole switch
1P+N - with a zero line terminal unipolar switch ( zero line break )
3P+N - with a zero line terminal of the triode switch ( zero line break )
Two: from technical aspect
Unipolar and bipolar switch three-pole switch, switch and four switch selection, is actually look line neutral line is disconnected, can adopt the following judgments: 1 consider maintenance safety: TT system needs an overhaul when neutral wire, so need poles and a four-pole switch, TN system, do a good job in isoelectric connection later, except in special circumstances (see measures ), does not need to disconnect neutral line, usually selected unipolar and pole can be. Quadrupole switch can use less with as little as possible, because of the presence of" zero risk breaking". 2 when there are two when power, to see if needed in the isolation of two grounding system. Other: 1P+N, 3P+N and 2P, 4P in electrical are as poles, four-pole switches to look at, in determining the need for disconnecting neutral line, but the neutral line current can not exceed the time line, from cost savings account, can choose 1P+N, 3P+N; if the neutral line current may exceed the phase ( harmonic etc. effect ), then you need to select 2P, 4P.
1P ( 1 ): only one switch wiring head, only a disconnected line, this switch is suitable for controlling a phase line" fire"
2P ( 3 ) switch: wiring head two, a connecting line and a zero line, the switch is suitable for controlling a phase a
3P ( 3 ) switch: terminals three, three are connected with the" fire" line, this switch is suitable for three-phase 380V voltage control circuit
4P ( 4 ) switch: terminals four, three are connected with the" fire" line, a zero line, the switch is applied to the control of four phase three wire circuit
Finally say a problem, is that we in the series were found in the same discussion series circuit breakers, but there may be some with N, such as 4P and 3P+N are four, that what is their difference, how should we choose?
According to the above discussion, both class four switch, different is, 4P N online with protection, 3P+N N line without protection, while the 3P+N N line not with overload, short circuit tripping coil, it does not play a protective role, N pole line and other 3 level exists between the mechanical relationship.
These are the personal experience and online reference opinions, the summary on the leakage circuit breaker series problems, hoping to help everyone to buy earth leakage circuit breaker.
Leakage circuit breaker models will contain Series in this article, such as the Shanghai people electric appliance switch factory production of the DZ47LE-16 2P C16A type leakage circuit breaker, which is the 2P series. In addition, the residual current circuit breaker will encounter such as 3P, 4P, 3P+N and other various types of series, different series and their meaning. Here according to the personal understanding, simple introduction.
First say what is under the series. From a professional perspective, the so-called breaker "pole" actually refers to the used for breaking wire knife pole, but not necessarily every knife pole are provided with protection function. Popular point is at the same time to disconnect the line number, for example 3P and 4P will be opened at the same time 3 or 4. For example, the general distribution box installation of 3P more, more in control of three-phase AC circuit power supply three phase lines. 4P actually can also be used in three-phase AC circuit control of three-phase power supply, and a control electrode is often used as a switch which is normally open auxiliary contact, when the other controller ( such as PLC ) need to collect the breaker on-off condition can be the contact as an on-off signal transmission in, these to see the actual needs and set.
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