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How to check relay ?

 How to check relay ?  

 – Relay is a electromagnetic control switch which connects and disconnects switch with the help of electromagnetic coil .

how to check relay


– To check relay at first we should check the  – resistance of coil (i.e. 85-86 pin) with multimeter . The resistance value is shown in the picture below .

how to check relay
incorrect resistance range 

how to check relay
correct resistance range


– we have to select correct range of resistance according to the requirement.


– Also we have to check switch or ( 30-87 pin) by giving supply to the coil as shown below 👇.

how to check relay


– If the relay  is normal open type, there must be continuity on switch pins when power supplied in coil .


Thanks 






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