Q:  What is Relay?

A:  Relay is an electromagnetic switching device used to make or break the connection of the devices/load connected to it, sometimes for low or medium Voltages purposes it directly makes or break connection of the load with source, and sometimes it actuate the heavy duty circuit breakers to make or brakes connections.

 

Q:  What are working  modes of Relays?

A:  There are two working mode of Relays,

1): Normally open

2): Normally Closed

 

Q:  What are High Voltage Relays?

A:  The Relays which are specially designed for High Voltage applications, normal Relays are for medium or low voltage applications but HV Relays are specially designed for High Voltage application, for that specific reason the relay is sometimes is designed using special Di-electric material and special contact material.

 

Q: How Relay work as protection device ?

A: Relay works as protective device by some controlling circuit which senses the abnormal conditions at load side, then generate a signal and pass to the Relay’s energizing coil which make or break the connection of the load with supply system.

 

Q: What is the difference between Contactors and Relays?

A:  There is no specific difference between both, both works on the same working principal, which is electromagnetic switching. But the difference comes when it come to load power (current or voltage) handling, for high power applications the contactors are preferred over relays but mean time they are expensive than the Relays, and the Relays are comparatively used where low power application is required, so the Relays becomes the cheaper option for low load applications.

 

Q: what is mechanical life of relay?

 A: The mechanical life of the relay gives the information about its switching cycles through its whole life span in normal usage condition.

 

Q: Is there any effect on the capacity of Relay because of type of the load?

A: Yes,there is effect on the capacity of Relay because of the type of the load. If the load is pure resistive, then there is no effect on the capacity of the Relay, but if there is high inductive or high capacitive load then there is directly effect on the current handling capacity of the relay because the power stored in inductive and capacitive loads float as extra power in system which degrades the current handling capacity of the relay.

 

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