The contactor is an automatic switch in industrial electricity that uses a button to control its on/off. The contactor consists of an electromagnetic coil, a static armature, a moving armature, a static contact, a moving contact and a fixing bracket. The principle is that when the electromagnetic coil of the contactor is connected to the communication force, a strong magnetic field will occur to make the static armature installed in the center of the coil attract the moving armature, and when the two groups of armature are closed, the moving contact installed on the dynamic armature is also closed with the static contact, so that the electrical circuit is connected. When the current in the solenoid coil is disconnected, the magnetic field disappears and the contactor returns to the disconnected state under the action of the tension spring. In industrial electrical, there are many types of contactors, and the current ranges from 5A to 1000A, and its use is appropriately wide.
A contactor is an electrical appliance that uses an electric current flowing through a coil to generate a magnetic field that closes the contacts to reach the control load. Because it can quickly cut off the AC and DC main circuits and can frequently connect to the high-current control circuit (some types can reach 800A) equipment, it is often used as a control object for motors, and can also be used to control power loads such as factory equipment, electric heaters, machine tools and various power units, and as a long-distance control equipment.
The AC contactor uses the main contact to open and close the circuit, and the auxiliary contact to turn on the control loop. The main contact generally only has a normally open contact, while the auxiliary contact often has two pairs of normally open and normally closed contacts, and the small contactor is often used as an intermediate relay cooperative main circuit. The contacts of the AC contactor, made of silver-tungsten alloy, have excellent electrical conductivity and high temperature ablation resistance. The action power of the AC contactor comes from the AC electromagnet, which is stacked by two "mountain" shaped fine silicon steel sheets, one of which is fixed, and the coil is sleeved on it, and the operating voltage is a variety of options for selection. In order to stabilize the magnetic force, the suction surface of the iron core is added with a short-circuit ring. After the AC contactor loses power, it is reset by relying on the tension spring. The other half is the movable core, which has the same structure as the fixed core, and is used to drive the switch of the main contact and auxiliary contact. Contactors above 20A are equipped with an arc extinguishing cover, which uses the electromagnetic force generated when the circuit is disconnected to quickly break the arc to protect the contact. The contactor has a high frequency of power opening and cutting control, and the high operating frequency can even reach 1200 times per hour. The service life of the contactor is very high, the mechanical life is generally millions to 10 million times, and the electric life is generally hundreds of thousands to millions of times.
Electromagnetic Contactors (Air Type)
The electromagnetic contactor is mainly composed of a contact system, an electromagnetic operating system, a bracket, an auxiliary contact and a shell (or chassis).
Since the coil of the AC electromagnetic contactor is generally powered by AC power supply, after the contactor is excited, there will generally be a high decibel "click" noise, which has also become the characteristic of the electromagnetic contactor.
Although after the 80s, various countries have carried out the silent and power-saving of AC contactor electromagnets, and one of the fundamental feasible plans is to reduce the voltage of the AC power transformer, and then convert it into DC power supply through the internal rectifier to supply power, but this complex control method is rare.
Vacuum contactors
Vacuum contactor: The contactor of the vacuum degaussing chamber is selected for the contact system.
Semiconductor contactors
Semiconductor contactors use contactors that change the conduction and open conditions of circuit circuits to complete current operation.
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