In simple terms activate the relay. How they work when the coil is supplied with voltage a magnetic field is generated around it which pulls the hinged armature down onto the contact.
Special Applications With Spdt Relays
How does a 12 volt relay work. Just an idea on how to wire each relay up. Through the control coil. The current ratings vary from a few amperes to about 3000 amperes. This completes the high current circuit between the terminals and the relay is said to be energised. How does a 12 volt relay work. Feel free to ask me anything.
Ratings there are current as well as voltage ratings. Items in a vehicle that require the highest amperage such as air conditioners engine fans starters and heater fans use 12 volt relays to keep the high amperage wires under the hood. The magnet pushes a switch to the left forcing the spring contacts together and completing the circuit theyre attached to. I know all about this stuff. Online repair july 10 2015. If you were to open a relay you would see an electromagnet coil the switch and a spring.
When the 5 pin relay is de energized off pins 4 and 5 have continuity. Looking at the diagram below you can see the pinout of a typical 12v relay. Type of contact used whether it is a nc or no or closed contact. The higher the amperage the thicker the wire and the greater the odds of a fire should a short in one of these wires occur. The coil then generates the magnetic field which moves the switch on and off. In this relay when a current flows through the coil it turns it into an electromagnet.
What happens inside a relay isnt magic but it is important. Iso relays are. This is a relay from an electronic hot water immersion heater programmer. 3 pin 4 pin 5 pin iso standardized relays iso relays were designed to try and standardize relay connections making it easier to test and design systems. Pull in voltage is the voltage required for the relay coil to energize and build enough strength the overcome the spring tension on the contact and pull it in. In case of voltage ratings they vary from 300 volt ac to 600 volt ac.
The spring holds the switch in position until a current gets passed through the coil. Understanding how the relay works will help with diagnosis and modifications to vehicle systems. There are also high voltage relays of about 15000 volts. It is not desirable to run heavy duty wire into the cabin of a. All relays and contactors have some mechanical resistance and the electromagnetic coil needs to pull against that tension. When the relay is energized on pins 3 and 5 have continuity.
Gallery of How Does A 12 Volt Relay Work
