Review on 🏎️ High-Performance 10 Pack Bosch Style 5-Pin 12V Relay Switches [SPDT] [30/40 Amp] for Auto Fan Cars - 12 Volt Automotive Relays by Nelson Calafell

Relays work for all practical purposes but the diagrams on top of the relay are all wrong. Contacts 87 and 87a must be swapped with the 30-pin switch pointing to 87a. 87a is the "normally closed" relay contact and should be on the right hand side and 87 is the "normally open" or "changeover" contact which should be on the left hand side. When you turn on relays 85 and 86, the magnetic field (dashed line) pulls the 30-pin switch to pin 87, which closes the relay. The top diagram shows the relay energized and closed at pin 87a. People will have serious problems if they have not used such relays before. This is what happens when companies buy from China without testing the product.