Relays are an essential component of any electrical circuit. They allow you to control an electrical circuit using a smaller voltage, which is safer and more efficient. 5 pin 12v relays are commonly used in automotive applications, but they can also be used in other circuits that require a low voltage control signal. In this article, we’ll explore the basics of 5 pin 12v relay wiring diagram and how to use them in your circuit.
What is a 5 Pin 12V Relay?
A 5 pin 12v relay is a type of relay that has five pins or terminals. These terminals are usually labeled as follows:
- Terminal 30 – Common (C)
- Terminal 85 – Coil Ground (GND)
- Terminal 86 – Coil Positive (+)
- Terminal 87 – Normally Open (NO)
- Terminal 87a – Normally Closed (NC)
The terminals are usually arranged in a specific pattern. Terminal 30 is usually in the center, while terminals 85 and 86 are located on either side of it. Terminals 87 and 87a are located opposite each other on the relay.
How to Wire a 5 Pin 12V Relay
Wiring a 5 pin 12v relay is relatively simple. Here’s a step-by-step guide:
- Identify the relay terminals. As mentioned earlier, the terminals are usually labeled as C, GND, +, NO, and NC.
- Connect the relay coil to a power source. The coil is the part of the relay that creates the magnetic field. Connect terminal 85 to ground and terminal 86 to a switched power source.
- Connect the load to the relay. The load is the device or circuit you want to control. Connect terminal 30 to the power source, terminal 87 to the positive side of the load, and terminal 87a to the negative side of the load.
- Test the relay. Turn on the power source and test the relay to make sure it’s working correctly.
Example Wiring Diagram
| Terminal | Description |
|---|---|
| C | Common |
| GND | Coil Ground |
| + | Coil Positive |
| NO | Normally Open |
| NC | Normally Closed |
Here’s a sample wiring diagram for a 5 pin 12v relay:
FAQ About 5 Pin 12V Relay Wiring Diagram
What is the difference between NO and NC on a 5 pin 12v relay?
NO stands for Normally Open, which means the circuit is open or disconnected when the relay is not energized. NC stands for Normally Closed, which means the circuit is closed or connected when the relay is not energized. When the relay is energized, the opposite happens.
Can I use a 5 pin 12v relay to control a high current load?
Yes, you can use a 5 pin 12v relay to control a high current load as long as the load is within the relay’s rated specifications. However, you may need to use an external relay driver transistor if the load requires a higher current than what the relay can handle.
Can a 5 pin 12v relay be used in AC circuits?
No, a 5 pin 12v relay is designed for DC circuits only. Using it in an AC circuit can damage the relay and may cause injury or damage to your equipment.
Can a 5 pin 12v relay be used in a motorcycle or car?
Yes, a 5 pin 12v relay is commonly used in automotive circuits, including motorcycles and cars. It’s often used to control lights, horns, and other accessories.
What is the maximum current rating for a 5 pin 12v relay?
The maximum current rating for a 5 pin 12v relay varies depending on the model and manufacturer. Typical current ratings range from 10A to 40A.
Conclusion
5 pin 12v relays are an essential component in many electrical circuits, including automotive circuits. With the right wiring diagram and a little bit of knowledge, you can easily integrate them into your circuit and control your loads with ease.
