In vehicles, relays are essential electrical components used to control circuits by opening or closing them through an electromagnet. They act as switches that enable low-power circuits to control high-power devices, such as starting the engine or activating lights. Here’s an overview of different types of car relays:

Single-Pole Single-Throw (SPST) Relays: This is the simplest type of relay with one input and one output. It has two positions: one open (off) and one closed (on). Often used for basic on/off applications, like controlling headlights or auxiliary equipment. Single-Pole Double-Throw (SPDT) Relays: These relays have one input and two outputs. They can switch between two different outputs, making them versatile for applications requiring multiple routes. Commonly used for automotive applications that need to switch between two states, like controlling wipers or fan speeds.
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