What Are Relay Switches Used For

A 3 way light switch is often found in your house where two light switches can be used to activate a single light.

What are relay switches used for.

However the supply of amplifying effect can help control the large amperes and voltages because if low voltage is applied to the relay coil a large voltage can be switched by the contacts. Relays are used where it is necessary to control a circuit by an independent low power signal. Overload relays are used for protection of motor from overload electrical failure. They are also used as automatic change over.

A relay is an electromechanical device that uses an electromagnet to open or close a switch. A relay is a simple electromechanical switch made up of an electromagnet and a set of contacts. Microprocessors use relays to control a heavy electrical load. To turn on an electric motor we need 230v ac supply but in few cases applications there may be a situation to switch on the motor with a dc supply voltage.

If you need to replace a relay make sure you use one with the same terminal layout as it is easy to overlook if you re not aware of the difference. Automatic stabilizers are one of its applications where a relay is used. Used to control the electric motor switches. They are used for controlling multiple circuits.

Relays are used for isolating a low voltage circuit from high voltage circuit. Relays are normally used in the control panels manufacturing and building automation to control the power along with switching the smaller current values in a control circuit. Relays are either electromechanical relays or solid state relays. A relay is an electrically operated switch it consists of a set of input terminals for a single or multiple control signals and a set of operating contact terminals the switch may have any number of contacts in multiple contact forms such as make contacts break contacts or combinations thereof.

In electromechanical relays emr contacts are opened or closed by a magnetic force. Here are two simple animations illustrating how relays use one circuit to switch on a second circuit. The terminal widths used on 4 and 5 pin relays are almost always 6 3mm wide however some more specialist relays can have terminal widths of 2 8mm 4 8mm and 9 5mm. When power flows through the first circuit 1 it activates the electromagnet brown generating a magnetic field blue that attracts a contact red and activates the second circuit 2.

This sample is exactly the same as a 3 way light switch the only difference being each physical switch is replaced by a relay. In this article we will look at how relays work and a few of their applications. In those cases a relay can be used. The circuit that powers the electromagnet s coil is completely separate from the circuit that is switched on or off by the relay s switch so it s possible to use a relay whose coil requires just a few volts to turn a line voltage circuit on or off.

This sample demonstrates how a 3 way light switch can be used to activate a light. Relays are found hidden in all sorts of devices.