Unload relay (conventional switching relay) plays a significant role in on-board electrics. Therefore, its function is described here:
Terminal 75 of the ignition switch is only energized when the ignition key is in the «Included». Powerful consumers, such as windscreen wipers, heated rear window or blower, are connected to this terminal so that when the engine is started, all the battery power goes to the starter. Of course, not all of these consumers can receive power through contact with the ignition switch; he is too weak for that. Therefore, a relay must be connected between them, through the working contact of which current is supplied. Ignition lock contact (along with energizing the headlights and the horn relay coil) only supplies the switching current to the relay.
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