Working Of Contactor With Diagram

A contactor is an electrical device which is used for switching an electrical circuit on or off. It is considered to be a special type of relay.

What is a contactor types working and applications?

A contactor's applications include controlling electric motors, thermal evaporators, lighting, capacitor banks , heating, and other electrical loads. Contactors range in size and capacity. You have those that you can easily lift with your hand to massive ones measuring about a meter on the side.

How is a contactor constructed?

A contactor has three primary components: The contacts are the current carrying part of the contactor. This includes power contacts, auxiliary contacts, and contact springs. The electromagnet (or “coil”) provides the driving force to close the contacts.

How contactor is connected?

The L1, L2, and L3 terminals are where the power wires connect to the contactor. The T1, T2, and T3 terminals are where the device wires connect to the contactor. The L1 contact connects to the T1 contact, the L2 contact connects to the T2 contact, and the L3 contact connects to the T3 contact.

What are two basic types of contactors?

Hence, it is a very important component of the contactor. The contacts are classified as power contact, auxiliary contact, and contact spring. There are two types of power contact; stationary contact and movable contact. The material used for the contacts has stable arc resistance and high welding resistance.

What are the three parts of a contactor?

These are normally the coil, the contacts, and the device enclosure.

• The coil, or electromagnet, is the key component of a contactor.
• The contacts are the components of the device that carry power across the circuit being switched. ...
• The contactor enclosure is another important part of the device.

What is AC 1 and AC 3 in contactor?

AC1 rated contactors are widely used in industrial applications where the motor is working on a non-power factor load. They are also widely used in homes and other commercial buildings where power factor correction is needed. On the other hand, AC3 contactors are mainly used for motor switching applications.

What is the symbol of contactor?

The contactor is designated as K and, in the coil symbol, the K1/4 indicates that there are four associated contacts. Sometimes the coil designation is placed beside the coil symbol. In this case there are three normally open power contacts, and one normally open control contact.

What is the advantage of contactor?

Advantages and Disadvantages of Contactors Simple Operation. High-load capacity. Low power consumption. Fast switching.

What is meant by contactor?

Definition of contactor : a device for repeatedly establishing and interrupting an electric power circuit under normal conditions.

What is NO and NC In contactor?

This is the only difference between NO and NC contacts. NO contact is normally open and becomes closed once its coil is energized. NC contact is normally closed and becomes open once its coil is energized.

What is difference between relay and contactor?

Relays are used to control contacts of an electrical circuit due to a change of parameters or conditions in the same circuit or any other associated circuit. Contactors, on the other hand, are used to interrupt or establish connections in an electrical circuit repeatedly under different conditions.

What controls a contactor?

What is a contactor a contactor is one of the main electrical circuit parts which can stand on its

What is difference between contactor and switch?

Relays are switching devices used in any control circuit for checking a condition or multiplying the number of contacts available. Contactors are switching devices used to control power flow to any load. Mainly used in control and automation circuits, protection circuits, and for switching small electronic circuits.

How do you test a contactor?

Put one lead on either side. And then push the middle that tells you that this side is good move to

What is the difference between MCB and contactor?

An electronic contactor is a simple switching device, whereas the circuit breaker is a protective system. The primary function of a contactor is controlling the power. A circuit breaker does the protecting. Contactor works under normal situations.

What is the difference between starter and contactor?

A contactor applies voltage to a contactor coil to close the contacts and to supply and interrupt power to the circuit. On the other hand, a starter employs overload relays to protect the motor from load surges by shutting it down to prevent overheating.

What is ac3 in contactor?

AC-3 - This category applies to squirrel cage motors with breaking during normal running of the motor. On closing, the contactor makes the inrush current, which is about 5 to 7 times the rated full load current of the motor. On opening, the contactor breaks the rated full load current of the motor.

How do contactor relays work?

A contactor joins 2 poles together, without a common circuit between them, while a relay has a common contact that connects to a neutral position. Additionally, contactors are commonly rated for up to 1000V, while relays are usually rated to only 250V.

What is 97 and 98 on a contactor?

Auxiliary contact They are provided with two auxiliary contacts – one NO (97-98) and another NC (95-96). NO contact is for trip signaling and NC contact is for disconnecting the contactor.