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 is the function of pins 30 and 87 in a 5-pin automotive relay?

Back

Pins 30 and 87 are used for the load side of the relay, where pin 30 is the common terminal and pin 87 is the normally open (NO) terminal.

Front

What is the resistance measurement between pins 30 and 87 in a properly functioning relay?

Back

.5 ohms or less.

Front

Which pins are designated for the coil side of a 5-pin automotive relay?

Back

Pins 85 and 86 are designated for the coil side of the relay.

Front

What does it mean if there is continuity between pins 87 and 87a?

Back

If there is continuity between pins 87 and 87a, it indicates a malfunction, as there should be no continuity between these pins.

Front

What is the purpose of the coil in a relay?

Back

The coil in a relay generates a magnetic field when energized, which activates the switch mechanism to open or close the circuit.

Front

What is the difference between normally open (NO) and normally closed (NC) contacts in a relay?

Back

Normally open (NO) contacts are open when the relay is not energized and close when energized, while normally closed (NC) contacts are closed when the relay is not energized and open when energized.

Front

What is the typical voltage range for automotive relay coils?

Back

The typical voltage range for automotive relay coils is usually 12V to 14V, matching the standard automotive electrical system.

Front

How can you test a relay for proper operation?

Back

You can test a relay by applying voltage to the coil pins (85 and 86) and checking for continuity between the load pins (30 and 87) using a multimeter.

Front

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

Back

Pin 87a is the normally closed (NC) terminal, which is connected to pin 30 when the relay is not energized.