AC contactor function and classification, country hair electrical switch factory, www.jiandq.com
1 types of AC contactor
According to being controlled by the motor or the load current types 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 selected. In three-phase AC systems generally use pole contactor.
2 main circuit parameters
Selection of main circuit parameters should be determined mainly for the rated operating 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 ( or rated current rated power control ).
The 3 control circuit parameters and auxiliary circuit parameters is
The contactor coil voltage according to the selected control circuit voltage. AC contactor control circuit current type AC and DC two, general circumstances the use of ac,
4 AC contactor coil voltage
General should enable the contactor coil voltage and control loop voltage rating. If the control circuit is simple, the contactors are less in number, then AC contactor coil generally rated voltage directly choose 380V or 220V. If the control circuit is more complex, the use of electrical appliances and more, for safety reasons, the optional lower rated voltage coil, then need to add a control transformer, such as BK control transformer.
The classification and selection of AC contactor to note is that these. I hope all of you to help!
Any of a class of products, 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 classify. Not tell you a joke, I started to learn this time, only the letter from judge the classification models, see CJX8 CXJ2 AC contactor, AC contactor, CJ20. The classification of the 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
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
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