Electrical Relay Wiring
As well as the standard descriptions of normally open no and normally closed nc used to describe how the relays contacts are connected relay contact arrangements can also be classed by their actions.
Electrical relay wiring. As relay diagrams show when a relay contact is normally open no there is an open contact when the relay is not energized. Basic electrical relays. Electrical relay contact types. Every circuit added to a modern car should be run through an automotive relay.
Variety of electric fuel pump relay wiring diagram. Instructions for wiring a standard automotive relay with descriptions of the pin out and the schematic. Top suggestions relay wiring for motor control. The iso mini relay we have looked at above has 4 pins or terminals on the body and is referred to as a make break relay because there is one high current circuit and a contact that is either open or closed depending upon whether the relay is at rest or energised.
Some people may ask why they should bother using a relay when you can just wire an accessory directly through a switch to its power source. Using relays in automotive wiring relays are a mechanical device that can connect or disconnect power to an accessory when it gets a low voltage signal from a switch. A classic example is the system used to start a car when someone turns an ignition key the ignition does not interact directly with the car battery. In either case applying electrical current to the contacts will change their state.
A 8 pin is glass type relay which we mostly used for different types of controlling and switching circuits. This post is about the 8 pin relay wiring diagram. When a relay contact is normally closed nc there is a closed contact when the relay is not energized.