What is a contactor?

Contactors are used to switch on and off the load. It is combined with a thermal overload relay to protect the operating electrical equipment. It is combined with a relay control loop to remotely control or interlock related electrical equipment.

AC contactor: The typical structure is divided into double-breakpoint direct-acting (LC1-D/F*) and single-disconnect-rotating (LC1-B*). The former has a compact structure, small size, and light weight; the latter is easy to maintain and is easily configured into a single-pole, two-stage, and multi-pole structure, but has a large size and mounting area.

DC contactor: The operation principle of the DC contactor is similar to that of the AC contactor, but the stored magnetic energy of the inductive load instantaneously releases when the DC is disconnected, and the high-energy arc generated at the breakpoint requires the DC contactor to have a certain arc extinguishing function. The medium/large-capacity DC contactor often adopts a single break plane layout overall structure, which is characterized in that the arc distance during breaking is long, and the arc extinguishing cover includes an arc extinguishing grid. The small-capacity DC contactor adopts a double breakpoint three-dimensional arrangement structure.

Vacuum Contactor: The vacuum contactor (LC1-V*) is similar in its components to a normal air contactor, except that the contacts of the vacuum contactor are sealed in a vacuum interrupter. Its characteristics are high on/off current and high rated operating voltage.

Semiconductor contactors: The main products such as bidirectional thyristors are characterized by no moving parts, long life, fast movements, free from explosions, dust, harmful gases, shock and vibration.