Type and type of AC contactor

AC contactors are mainly classified into the following categories and corresponding models.

1, the most commonly used is the air electromagnetic AC contactor

In the contactor, the air electromagnetic AC contactor is the most widely used, and the product series and variety are the most, but its structure and working principle are the same. At present, the domestic air electromagnetic contactor is commonly used CDC10 (Chengtai CJT1), CJ12, CJ20, CJ40, CJX1, CJX2, CDC1 and other series of AC contactors.

2. Switching capacitor contactors commonly used in capacitor distribution cabinets

The switching capacitor contactor is dedicated to the low-voltage reactive power compensation device, and the capacitor group is input or cut off to adjust the power factor of the power system. The switching capacitor contactor adds a device for suppressing surge on the basis of the air electromagnetic contactor, so as to close the switch. The surge current at the time suppresses the impact of the capacitor and the overvoltage at the time of opening. Commonly used products are CDC9 and so on.

3, mechanical interlocking AC contactor

The mechanical interlocking AC contactor is actually composed of two AC contactors of the same specification plus a mechanical interlocking mechanism and an electrical interlocking mechanism, ensuring that the two contactors cannot be simultaneously attracted in any case. Commonly used mechanical interlocking contactors are CJX1-N, CJX2-N, CJX4-N and the like.

4, the future development trend of intelligent contactors

The intelligent contactor is equipped with an intelligent electromagnetic system and has the function of communicating with the data bus and other devices. It also has the ability to automatically identify, control and execute the operating conditions. The intelligent contactor is composed of an electromagnetic contactor, an intelligent control module, an auxiliary contact group, a mechanical interlocking mechanism, an alarm module, a measurement display module, a communication interface module, etc., and its core is a microprocessor or a single chip microcomputer.

5. DC contactors for special occasions that are not commonly used

The structure of the DC contactor has two structures: a three-dimensional arrangement and a planar arrangement. The electromagnetic system adopts a snap-fit ​​structure that rotates around an angular angle, and the main contact adopts a double-breakpoint bridge structure or a single-breakpoint rotary structure. Commonly used DC contactors are CZ0 and so on.

6, the best quality vacuum AC contactor

The vacuum AC contactor uses vacuum as the arc extinguishing medium, and its main contact is sealed in the vacuum switch tube. The vacuum switch tube uses vacuum as the insulation and arc extinguishing medium. When the contacts are separated, the arc can only be maintained by the metal vapor evaporated from the contacts, because the vacuum has high dielectric strength and the medium recovery speed is fast, vacuum arc The plasma quickly spreads around, and the arc is extinguished when the first voltage crosses zero. Commonly used domestic vacuum contactors are available in CKJ5 series.