For example, if you wanted to install some high-powered work lights that activate with the headlights, there's a chance they'd exceed the capacity of the existing loom.īecause high current capacity wiring and switches are more expensive than lower current capacity versions, using relays reduces the need for more expensive components.Activating more than one circuit from a Single InputĪ single input signal from one part of an electrical system (e.g., central locking output, manual switch, etc.) can be used to activate one or more relays, which then complete one or more other circuits, allowing you to carry out multiple functions from a single input signal. This is the most common reason, and it is useful when an in-line switch or existing circuit cannot handle the required current. Using a lower current circuit to replace a high current circuit. There are several reasons why you might need or want to use a relay: The relay switching pins include the following: common, NC (normally open), and NO (normally close). The remaining pins and contacts are known as main contacts or switching contacts. As a result, we will supply 12 volts of DC (Direct current) to the relay coil. And if we have the 220 ACV, we can supply the relay coil with 220 volts AC (alternating current). As an example, suppose we have a 12-volt DCV relay. Where we supply the necessary ratting current. However, we have two coil pins on each pin. These contacts are pins 4, 5, 8, 11, 14, and so on. It can be based on the pins or contacts, ampers, or voltage ratting (AC or DC). The relay comes in a variety of shapes and sizes. In this post, I'll go over the fundamentals of 4 and 5 pin relay wiring diagrams. In layman's terms, a relay is an electromagnetic switch that is typically used to switch the power supply either automatically or manually. Ⅳ 4 Pin Relay Wiring Diagram vs 5 Pin Relay Wiring DiagramĤ.1 The Main Difference between 4 or 5 Pin RelaysĤ.3 Sample Wiring Diagrams for a 4 Pin Normally Open RelayĤ.4 Why to Use a 4 Pin Relay for Driving LightsĤ.7 5 Pin Relay Wiring Diagram for lights
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