5-pin automotive relay

Front

What is a 5-pin automotive relay?

Back

A 5-pin automotive relay is an electromechanical switch used to control a high-power circuit with a low-power signal, typically found in automotive applications.

Front

What are the coil pins in a 5-pin automotive relay?

Back

The coil pins are the two pins that activate the relay when a voltage is applied, usually labeled as 85 and 86.

Front

What is the resistance range between the coil pins of a 5-pin automotive relay?

Back

The resistance between the coil pins (85 and 86) should typically read between 70 - 120 ohms.

Front

What is the function of pin 30 in a 5-pin automotive relay?

Back

Pin 30 is the common terminal that connects to the power source.

Front

What is the function of pin 87 in a 5-pin automotive relay?

Back

Pin 87 is the normally open (NO) contact that connects to the load when the relay is activated.

Front

What is the function of pin 87a in a 5-pin automotive relay?

Back

Pin 87a is the normally closed (NC) contact that connects to the load when the relay is not activated.

Front

What is the resistance between pins 30 and 87 when the relay is activated?

Back

.5 ohms or less.

Front

What is the resistance between pins 30 and 87a when the relay is not activated?

Back

.5 ohms or less.

Front

How do you test a 5-pin automotive relay?

Back

To test a relay, measure the resistance between the coil pins and check the continuity between the common pin and the NO/NC pins when the relay is activated.

Front

What happens to the circuit when a relay is activated?

Back

When a relay is activated, it closes the circuit between the common pin (30) and the normally open pin (87), allowing current to flow.