Applications of Relay

 Applications of Relay 

The normally closed contact is left floating. 

The double-pole versions are same as the single-pole version except when the two switches open and close together.

Control a high-voltage circuit with a low-voltage signal, as in some types of modems or audio amplifiers.

Control a high-current circuit with a low-current signal, as in the starter solenoid of an automobile.

Detect and isolate faults on transmission and distribution lines by opening and closing the circuit breakers.

Time delay functions. 

Relays can be modified to delay opening or delay closing set of contacts. 

A very-short delay uses a copper disk between the armature and moving

blade assembly.

Typical applications of relays include computer interfaces, telecommunication systems,

traffic control, automotive electrical systems, home appliances, lighting control systems, electric motor controllers, tools and machines, air-conditioning and heating system.