Understanding the pinout for EC2-3NU
I am able to pass DC current through the coil pins but not through the normally open (no) pins (4, and 5) which should be, well, normally open. Is it because I DC does not goes through a relay?


Relays are described like switches. And when a switch is "open", it doesn't conduct current because the connection between its terminals is open. When it's "closed" is when we expect it to conduct current.

The relay will have no trouble conducting DC current if you test the normally closed terminal, or energize the coil before testing the normally open terminal.