What is the function of a 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 a contactor VS relay?

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 the function of relay?

A relay allows circuits to be switched by electrical equipment: for example, a timer circuit with a relay could switch power at a preset time. For many years relays were the standard method of controlling industrial electronic systems.

What is relay function?

What is the main difference between a relay and a contactor and between a contactor and a magnetic motor starter?

Comparison of Relay and Contactors

Relays	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.
Relatively smaller in size	Larger when compared to Relays

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). The normally open relay does not allow current to pass, while a normally closed relay is energized and current passes the relay.

Where is relay used?

Relays are used to control high voltage circuits with the help of low voltage signals. Similarly they are used to control high current circuits with the help of low current signals. They are also used as protective relays. By this function all the faults during transmission and reception can be detected and isolated.

Why do we use relays?

Relays are used to provide time delay functions. They are used to time the delay open and delay close of contacts. Relays are used to control high voltage circuits with the help of low voltage signals. Similarly they are used to control high current circuits with the help of low current signals.

Is relay a sensor?

The term “relay” is usually called a variety of devices, the switching contacts in response to a change in some input variable, not necessarily electric. In fact it is the sensors that are connected to the relay and interacting with them according to a specific algorithm.

Why is relay important?

Relays can reduce the need for high-amperage wiring and switches, which are expensive and take up space. Therefore, switching to relays in your electronic systems can reduce the size or weight of a casing, for instance, or allow manufacturers to fit more functionality into a space of the same size.

What does a relay do?

Relays are switches that open and close circuits electromechanically or electronically. Relays control one electrical circuit by opening and closing contacts in another circuit. As relay diagrams show, when a relay contact is normally open (NO), there is an open contact when the relay is not energized.

What is the difference between a contactor and a relay?

Lastly, contactors are commonly connected to overloads that will interrupt the circuit if the current exceeds a set threshold for a selected time period, usually 10-30seconds. This is to help protect the equipment downstream of the contactor from damage due to current. Overloads are much less common on relays. Contactor vs Relay Applications

What is the function of a relay?

A relay is an electronic control device, which has a control system (also called an input loop) and a controlled system (also called an output loop), and is usually used in automatic control circuits. It is actually an “automatic switch” that uses a smaller current to control a larger current.

What is a contactor coil?

Contactors are compact in size and are often field-mounted easily. These electrical devices feature multiple contacts in general. In most cases when the contactor coil is energized these contactors remain open and provide operating power to the load. Contactors are generally used for controlling electric motors.

What is the difference between contactor and auxiliary contact?

For example, the contactor may transmit power to the motor, while the auxiliary contact is in the control circuit of the motor starter and commonly used to turn on a pilot light indicating the motor is operating. 4. Safety Features (Spring-Loaded Contacts)