Relay Diagram 87a. The relay toggle common connection is the lone connection all by itself at position 30. You can think of this as the switch in off.
Our 30 amp relay is our most economical. Standard line changeover relay. In the relays normal condition at rest pin 30 is connected to pin 87a making pin 87a normally closed or nc pin 87 is not connected to pin 30 at rest so its status is normally open or no.
Lets take it apart.
Thats my theory but is it right. In a five pin relay the relays high amperage circuit consists of three terminals 30 87 and 87a. Automotive relay guide 12 volt planet according to din 72552 the coil should be fed with 12v to terminal 86 and grounded via. 36 w nominal voltage vdc and 87a use this particular times.