Contactor is an automatic control appliance. Mainly used for frequent connection or disconnection, dc circuit, with large control capacity, can long distance operation, with the relay can realize timing operation, interlocking control, quantitative control and pressure loss and undervoltage protection, widely used in automatic control circuit, its main control object is the motor, can also be used to control other power load, such as electric heater, lighting, welding machine, capacitor bank, etc. The contactor can not only connect and cut off the circuit, but also has the low voltage release protection effect. The contactor control capacity is large. Suitable for frequent operations and remote control. Is one of the most important components in the automatic control system. In industrial electrical, there are many models of contactors, the current in 5A-1000A, its use is quite extensive.
According to the different types of main current, contactors can be divided into AC contactor and DC contactor.
Principle: the contactor is mainly composed of electromagnetic system, contact system, arc extinguishing device and other parts. The principle of the electromagnetic contactor is that when the electromagnetic coil of the contactor is energized, it will produce a strong magnetic field, so that the static core produces electromagnetic suction to attract the armature, and drive the contact action: often close the contact disconnected, often open the contact closed, the two are linked. When the coil is powered off, the electromagnetic suction disappears, and the armature is released under the action of the release spring, restoring the contact: the normally closed contact is closed and the normally open contact is disconnected.
Post time: Mar-13-2023
