What is the working principle of contactor?

Operating Principle of a Contactor:The current passing through the contactor excites the electromagnet. The excited electromagnet produces a magnetic field, causing the contactor core to move the armature. A normally closed (NC) contact completes the circuit between the fixed contacts and the moving contacts.

How does a 3 phase contactor work?

A three-phase contactor is an electronic device used to turn power on or off at a three-phase load. These devices are used when the voltage requirements of the load exceed the power-handling capability of a mechanical relay. A contactor uses a low-voltage signal to control the high-voltage circuit.

What is electromagnetic contactor?

Electromagnetic Contactor is a single pole heavy duty contactor designed to be used on traction vehicles. In order to work efficiently both AC and DC circuits, the contactors are equipped with arc blow-out circuit.

What is the use of contactor in AC?

Contactors work in the same way, except instead of controlling the flow of traffic, they control the flow of electricity. These devices are used to provide and cut off the supply of power to many of your air conditioner’s components, including the compressor, the condenser and your system’s various motors.

What is the working principle of a contactor?

Working Principle of Contactors: The time supplied to the contactor generates an electromagnetic field and the fixed coil and the moving coil are attracted to one another. Initially, the current of the electromagnetic field is only more.

How is an electromagnetic field generated in a contactor?

Where each of the contacts has its own functions, which is explained in principle of operation of the contactor. An electromagnetic field is generated whenever current flows where the moving coils attract each other. A large amount of current is drawn initially by an electromagnetic coil.

What happens when a contactor is de-energized?

On de-energizing, the contactor coil gravity or spring moves back the electro-magnetic coil to its initial position and there is no flow of current in the circuit. If contactors are energized with AC current, a small portion of the coil is the shaded coil, where the magnetic flux in the core is slightly delayed.

What kind of excitation does a twin contactor use?

Twin or bifurcated contacts can be used to avoid bouncing and improve reliablity. The excitation power to the coil can be either AC or DC (available in various voltage ranges starting from 12Vac/ 12Vdc to 690Vac) or even universal.