what is contactor in electrical

A contactor is an electrical device which is used for switching an electrical circuit on or off. ... These contacts are in most cases normally open and provide operating power to the load when the contactor coil is energized. Contactors are most commonly used for controlling electric motors.

1. What is the main function of contactor?
2. What is the difference between a relay and a contactor?
3. What are the types of contactors?
4. What is NO and NC In Contactor?
5. How do I choose a contactor?
6. What is contactor and types?
7. Why use a relay instead of a contactor?
8. What is the difference between AC and DC contactor?
9. Why do we need contactors?
10. What is 3phase contactor?
11. How do you select a contactor for a motor?

What is the main function of contactor?

A contactor is an electrically-controlled switch used for switching an electrical power circuit. A contactor is typically controlled by a circuit which has a much lower power level than the switched circuit, such as a 24-volt coil electromagnet controlling a 230-volt motor switch.

What is the difference between a relay and a contactor?

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 are the 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 is NO and NC In Contactor?

Relays and contactors as used in Chamberlain products can be applied in two modes: normally open (NO) and normally closed (NC). ... Contactor - A magnetically-operated device, for repeatedly establishing and interrupting an electrical power circuit.

How do I choose a contactor?

When selecting a contactor, please make sure that the contactor's rated current is specified for the AC-3 load type. Ensure that you are looking at the right table. You can see the rated current for the AC-3 load is lower than the rated current for the AC-1 load.

What is contactor and types?

A contactor is an electrical device which is used for switching an electrical circuit on or off. ... Contactors are most commonly used for controlling electric motors. There are various types of contactors, and each type has its own set of features, capabilities, and applications.

Why use a relay instead of a contactor?

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.

What is the difference between AC and DC contactor?

AC contactor adopts a grid arc extinguishing device while the DC contactor adopts a magnetic quenching arc extinguishing device. AC contactor has a large starting current, its maximum operation frequency is about 600 times an hour, while that of DC contactor can be 1200 times an hour.

Why do we need contactors?

Contactors are used for high power applications. They allow a lower voltage and current to switch a much higher power circuit, so they are generally larger and more heavy-duty than control relays, enabling them to switch higher power loads on and off for many thousands of cycles (Figure 1).

What is 3phase contactor?

3 pole contactors are electrically controlled switches (relays) used for switching an electrical power circuit. A contactor is typically controlled by a circuit which has a much lower power level than the switched circuit, such as a 24-volt coil electromagnet controlling a 220-volt motor switch.

How do you select a contactor for a motor?

As per above chart:

1. Type of Contactor = AC7b.
2. Size of Main Contactor = 100%X Full Load Current (Line).
3. Size of Main Contactor = 100%x6 = 6 Amp.
4. Making/Breaking Capacity of Contactor = Value above Chart x Full Load Current (Line).
5. Making/Breaking Capacity of Contactor = 8×6 = 52 Amp.