How Contactors Work? Working of Contactor Explained with 3D Animation

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Transcript

00:00The person who invented the contactor is really a genius.

00:04As a common switch controller in electrical engineering,

00:07how does it open and close the circuit breaker by controlling the circuit?

00:11First, input power will connect the circuit breaker to L1, L2, and L3 of the contactor.

00:17On the opposite side, you can see T1, T2, and T3 contacts.

00:21They are directly connected to the load device, which is a three-phase motor as shown in the

00:26picture. A1 and A2 are the connecting contacts of the contactor coil. They are used to control

00:32the contactor, so if we want to engage or disengage the contactor, we need to use the

00:37two contacts A1 and A2. Assume that the control voltage of this contactor is 240V.

00:43In other words, if we connect the input voltage to the A1 and A2 contacts,

00:49then this coil will generate a magnetic field. When the coil generates a magnetic field,

00:54it will attract the moving iron core in the center and cause the switch contacts to close.

01:00Then the current will be transmitted to the load device.

01:03So how does this happen? First, connect it to one of the phases through a unipolar circuit breaker.

01:09When you open this circuit breaker, the power will be output and go through the stop button,

01:13so the stop button is inside the contactor. It has a long arm that is normally closed.

01:19When the stop button is pressed, the power is cut off from there and goes to the start button,

01:23which is normally open. When you press the start button, it switches the contact to closed,

01:28so the power comes out of the start button and goes to A1 of the coil contact. The other wire

01:33of the circuit breaker is connected to A2, so the coil will get current and create a magnetic field.

01:39Due to this magnetic field, the movable iron core above is attracted to the fixed iron core below

01:45and moves downwards, causing this contact to close and the current to be transferred to the load

01:51device. When you release your finger from the start button, it will cut the phase wire. Once the

01:56power is cut off, the coil will lose its magnetic field and the movable iron core will move upwards

02:02under the force of the spring. The contactor will be detached and the load device will stop running.

02:08I hope you enjoyed this video and learned something new about the contactor and how it works.

02:14If you did, please give it a like, comment, share, and follow me for more videos like this.

02:18Thank you for watching and have a great day!

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