How Does A 12 Volt Relay Work

What happens inside a relay isn t magic but it is important.

How does a 12 volt relay work.

Relays are switches controlled by electrical power like another switch computer or control module. They also provide the ability to switch multiple circuits including different voltage types within. A datasheet is a document with detailed specifications of a component. A relay is essentially a switch that is operated electrically rather than mechanically.

However the real benefit behind a relay is more than just automation. Second relay coil 5v i want the system to start the 12 volt battery automatically when power goes off. Understanding how the relay works will help with diagnosis and modifications to vehicle systems. Let s start by looking at a datasheet for an ad pr40 1c 12d 12v relay which is an open style power relay.

Automotive relays and how they work automotive relays of all shapes and sizes can be found in just about every car truck and even boats. Relays in general are used to enable a low amperage circuit to switch on or off a higher amperage circuit like turning on your headlights. Although there are various relay designs the ones most commonly found in low voltage auto and marine applications are electro mechanical relays that work by activating an electromagnet to pull a set of contacts to make or break a circuit.