What is the function of AC contactors? Why do AC contactors need to be used?
The function of AC contactor:
1. In electrotechnics, because the main circuit of AC and DC can be switched off quickly and the device of high current control (up to 800A) circuit can be connected frequently, it is often used for motor as control object, and also for controlling power loads such as plant equipment, electric heater, working mother machine and various power units. Contactors are not only used for motor control, but also for power load control. It can turn on and off the circuit, and has the function of low voltage release protection.
2. Connect and disconnect the circuit of the electric appliance.
3. Contactor has large control capacity and is suitable for frequent operation and long-distance control. It is one of the important components in automatic control system.
4. In industrial electrical, there are many types of contactors, and the working current varies from 5A to 1000A. They are widely used.
Reasons for the need for AC contactors:
1. AC contactors are widely used as power switching and control circuits. It uses the main contacts to turn on and off the circuit, and the auxiliary contacts to execute the control instructions.
The main contacts usually have only regular open contacts, while the auxiliary contacts often have two pairs of contacts with normal open and normal closed functions. Small contactors are often used as intermediate relays to cooperate with the main circuit.
The contact of AC contactor is made of Ag-W alloy, which has good conductivity and high temperature ablation resistance.
2. Because contactor is an automatic switcher used to connect or disconnect AC/DC main circuit or large-capacity control circuit with load. The main control object is motor. In addition, it is also used for other power loads, such as electric heater, welding machine, lighting equipment, contactor, which can not only connect and disconnect circuit, but also has low cost. Voltage Release Protection.
3. Contactor has large control capacity and is suitable for frequent operation and long-distance control. It is one of the important components in automatic control system.
