Can someone explain this type of relay switch?

Electromechanical Relays
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1

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where do i connect power ground and the two terminals to connect once the relay is energized?

2

Hi @maysam786 ,

Welcome to Digi-Key TechForum! Below are connections:
2 is positive coil voltage
3 is negative coil voltage
1 & 4 are normally open, and close while coil is energized

Hope this helps!