air conditioner contactor

In electrical engineering, because it can quickly cut off the main circuit of AC and DC and can frequently connected with the current control (some types of up to 800 Amperes) circuit device, so often used in motor do as the control object, can also be used to control factory equipment, electric heater, machine tools and all kinds of electric power unit and power load contactor can not only connect and disconnect the circuit, but also has low voltage release protective effect. Contactor control capacity, suitable for frequent operation and remote control. Is one of the important components in the automatic control system. In industrial electrical, the model of the contactor is a lot of electric current in the range of 5A-1000A, its use is quite extensive.
AC contactor is used to open and close circuit, with auxiliary contacts to control loop. The main contact is normally open contact, and the auxiliary contact often two pairs of normally open contact and normally closed contact, small contactor is also often used as the intermediate relay with the main circuit. The contact of AC contactor, made of silver tungsten alloy, has good electrical conductivity and high temperature resistance. The action of AC contactor power source to communicate through the generated by the iron core coil with a magnetic field, the electromagnet core is made up of two “mountain” shape of young silicon steel sheet laminated, which a fixed iron core, a coil is sheathed, voltage can choose a variety of. In order to make the magnetic stability, pull side core plus short circuit ring. AC contactor is on the loss of power, relying on the spring reset. The other half is the active iron core, the structure and the fixed iron core, used to drive the main contact and auxiliary contact closure. More than 20 amps contactor with arc shield, the circuit is disconnected from the electromagnetic force, fast breaking arc, the protection of contact. With a high frequency of operation, the highest operating frequency can be up to 1200 times per hour when the power is turned on and off. The service life of the contactor is very high, the service life of the machine is usually ten million times.
Technology development
AC contactor is made as a whole, and its appearance and performance are improved, but the function is always the same. Regardless of the extent of the development of the technology, the ordinary AC contactor has its important status. Air electromagnetic contactor electromagnetic contactor (in English: magnetic Contactor) is mainly composed of a contact system, electromagnetic operating dynamic system, bracket and an auxiliary contact and the shell (or frame). Because the AC electromagnetic contactor coil commonly used AC power supply, after the excitation contactor, usually a high decibel “slightly” noise, which is the electromagnetic contactor characteristics. After the 1980s, countries of AC contactor electromagnet soundless and power-saving, one of the basic feasible solution is the AC power supply with a step-down transformer, the internal rectifier DC conversion power supply, but the complex control mode does not see more. The vacuum contactor is vacuum contactor contactor contact system by vacuum chamber degaussing. Semiconductor contactor is a kind of contactor, which is operated by the conduction state and the state of circuit breaker. Permanent magnet contactor permanent magnetic AC contactor is using pole same-sex repulsion, opposites attract the principle, permanent magnet drive mechanism to replace the traditional electromagnet drive mechanism and the formation of a micro power contactors.