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Yangzhou Tianyuan Electrical Co.,Ltd.
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    You are here: Home >> News-Classification and selection of AC contactor
Classification and selection of AC contactor
  The publisher:admin Release time:2011/12/10 Read:255Secondary

Any of a class of product, only to understand its basic knowledge, understand the similar products of different models of distinction and connection, can choose the products they need. It also shows that the understanding of the importance of product classification. For AC contactor is the same, must use good, must first be classified. Not tell you a joke, I started to learn this time, only the letter from judge the classification models, see the CJX8 AC contactor AC contactor, CXJ2, CJ20 etc.. The classification of CJ series AC contactor. Now remember, burst out laughing.

This paper mainly discusses the classification and selection of AC contactor, first introduced the classification:

According to the main contact control circuit can be divided into categories: AC and DC two class

According to the main contact position ( when the excitation coil without electricity ) can be divided into: normally open, normally closed normally open and one part, another kind of normally closed the three class

According to the main contact pole number: can be divided into unipolar, bipolar, triode, tetrode, pentode

According to the arc extinguishing media: can be divided into air ( such as CJ20, CJ40 ) and vacuum

Next next AC contactor selection, in the previous article also mentioned the AC contactor selection, there is added. Mainly emphasize a few:

1 types of AC contactor

According to being controlled by the motor or the load current type to choose contactor type, AC load should be used with AC contactor, DC load should be used in DC contactor. If the control system is mainly the AC load, and the load capacity is small, can all use the AC contactor, but contact current rating should be elected. In three-phase AC systems generally use pole contactor.

2 main circuit parameters

In order to determine the selection of main circuit parameters for rated voltage (with frequency ), rated current ( or rated control power ), rated breaking capacity, overload withstand current and short-circuit protective device coordination. The contactor can be in different rated voltage and rated working current work. But in any case, the selected rated voltage not higher than the rated insulation voltage contactor, selected rated current ( or rated control power ) or above the contactor in the corresponding work conditions rated current ( or rated control power ).

3 parameter control circuit and auxiliary circuit parameters

The contactor coil voltage according to the selected control circuit voltage. AC contactor control circuit current type AC and DC two, mostly by ac,

4 AC contactor coil voltage

The general should make contactor coil voltage and a control circuit voltage rating. If the control circuit is simple, the contactors are less in number, then the AC contactor coil generally rated voltage direct select 380V or 220V. If the control circuit is more complex, the use of electrical appliances and more, for safety's sake, coil rated voltage optional low, then need to add a control transformer, such as the BK control transformer.

The classification and selection of AC contactor to note is that these. I hope all of you to help!


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    Add:No. 8 Hongyang Road, Hanjiang District, Yangzhou City, Jiangsu Province Tel:0514-87780609 Fax:0514-87780509 Mail:YZTY609@sina.com