Contactor is a widely used switch mounted electrical appliance. Mainly used for frequent connection or disconnection of AC and DC main circuits and large capacity control circuits, it can be operated remotely and timed with relays. Its main control object is the electric motor, and it can also be used to control other power loads. There are many types of contactors, including AC contactors, DC contactors, DC controlled AC contactors, mechanical interlock contactors, and switching capacitor contactors. Due to the wide variety of contactors, the editor of Zhangle.com will introduce the models of AC contactors here.

The commonly used AC contactors produced in China include CJl0, CJl2, CJX1, CJ20 and their derivative series products. The CJ0 series and its modified products have gradually been replaced by CJ20 and CJX series products. The above series of products generally have three pairs of normally open main contacts, two pairs of normally open and two pairs of normally closed auxiliary contacts. The commonly used DC contactors include the CZ0 series, which are divided into two categories: single pole and double pole. The number of normally open and normally closed auxiliary contacts should not exceed two pairs each.

In addition to the commonly used series mentioned above, China has also introduced some production lines in recent years to produce AC contactors that meet IEC standards. Below is a brief introduction.

AC contactors can be divided into three types: electromagnetic, permanent magnet, and vacuum. Commonly used AC contactors CJ10, CJ40, CJ12, CJ20, as well as imported models such as CJX, 3TB, and B. The models are not exactly the same, because each brand has its own model, and they are all different.

The meaning of CJX1-140 exchanger refers to the contactor model CJX1-140, where 'C' represents' contactor ',' J 'represents' AC', 'X' represents' small ',' 1 'represents design number, and' 140 'represents rated current of 140A.

Air electromagnetic AC contactor: Among contactors, air electromagnetic AC contactors are the most widely used, with the most product series and varieties, but their structure and working principle are the same. Currently, commonly used domestic air electromagnetic contactors include CDC10, CJ12, CJ20, CJ40, CJX1, CJX2, CDC1 and other series of AC contactors.

The CJl2B-S series locking contactor is used in the electrical circuits of Ankang Decoration Company for AC 50Hz, voltage 380V and below, current 600A and below, for remote connection and disconnection of circuits, and is suitable for infrequently starting and stopping AC motors. It has the characteristics of no power supply and no noise to the attraction coil during normal operation. The locking mechanism is located below the electromagnetic system. The locking mechanism relies on the attraction coil to be powered on, and after the attraction coil is powered off, it is held in the locked position by the locking mechanism. Due to the coil not being powered, not only is there no power loss, but also magnetic noise is eliminated.

Siemens' 3TB series and BBC's B series AC contactors imported from Germany are at the level of the early 1980s. They are mainly used for remote connection and disconnection of circuits, and are suitable for frequent starting and control of AC motors. The 3TB series products have the characteristics of compact structure, long mechanical and electrical life, easy installation, and high reliability. The rated voltage is 220-660V and the rated current is 9-630A.

Main series and models of AC contactors：

① CJ20J series permanent magnet AC contactor

② NSFC1 series permanent magnet AC contactor

③ NSFC1-D series permanent magnet AC contactor

④ NSFC2 series permanent magnet AC contactor

⑤ NSFC3 series permanent magnet AC contactor

⑥ NSFC4 series permanent magnet AC contactor

⑦ NSFC5 series AC/DC control train specific AC contactor

⑧ NSFC12 series permanent magnet AC contactor

⑨ CJ40J series permanent magnet AC contactor

⑩ NSFMR series permanent magnet AC contactor

AC contactors have a wide range of applications and are intermediate control components. Their advantage is that they can frequently turn on and off lines, controlling large currents with small currents. Working in conjunction with thermal relays can also provide overload protection for load equipment. Nowadays, over 90% of automated control power systems use contactors, which are more efficient and flexible compared to manual labor. Through the above classification, I believe everyone has a certain understanding of the models of AC contactors.