Relays are essential components in many electrical circuits. They are used to control high power loads with small control signals. A relay is an electromechanical switch that can make or break electrical connections. The normally closed (NC) relay is a type of relay that is in the closed position when it is not energized. In this article, we will discuss the 12v normally closed relay wiring diagram.
What is a 12v Normally Closed Relay?
The 12v normally closed relay is a type of relay that is used in automotive and industrial applications. It is also known as a NC relay or a Form B relay. When the relay is not energized, the normally closed contact is closed, and the normally open contact is open. When the relay is energized, the normally closed contact opens, and the normally open contact closes.
The 12v normally closed relay is rated for 12 volts DC and can handle currents up to 30 amps. It is commonly used to control high power devices such as lights, motors, and solenoids. The relay is activated by a small control signal, which can be a switch, a sensor, or a computer.
Wiring Diagram for a 12v Normally Closed Relay
The wiring diagram for a 12v normally closed relay is quite simple. The relay has five pins, which are numbered 85, 86, 87, 87a, and 30. Pin 85 and Pin 86 are the coil pins of the relay. Pin 87 is the normally open (NO) contact, and Pin 87a is the normally closed (NC) contact. Pin 30 is the common contact.
The following diagram shows the wiring diagram for a 12v normally closed relay:
| Pin | Description | Connection |
|---|---|---|
| 85 | Coil Pin 1 | Connect to Positive (+) side of power source |
| 86 | Coil Pin 2 | Connect to Negative (-) side of power source |
| 87 | Normally Open Contact | Connect to load |
| 87a | Normally Closed Contact | Connect to other side of load |
| 30 | Common Contact | Connect to Positive (+) side of power source |
FAQs
What is a normally closed relay?
A normally closed relay is a type of relay that is in the closed position when it is not energized. When the relay is energized, the normally closed contact opens, and the normally open contact closes.
What is a Form B relay?
A Form B relay is another term for a normally closed relay.
How do I know if my relay is normally closed?
You can determine if a relay is normally closed by looking at its pinout diagram. Normally closed relays have a pin labeled 87a, which is the normally closed contact. Additionally, the relay will be labeled as Form B or NC.
What is the difference between a normally open and normally closed relay?
A normally open relay is a type of relay that is in the open position when it is not energized. When the relay is energized, the normally open contact closes, and the normally closed contact opens. In contrast, a normally closed relay is in the closed position when it is not energized. When the relay is energized, the normally closed contact opens, and the normally open contact closes.
What is the voltage rating for a 12v normally closed relay?
A 12v normally closed relay is rated for 12 volts DC.
Conclusion
The 12v normally closed relay is a useful component in many electrical circuits. It is used to control high power devices with small control signals. The wiring diagram for a 12v normally closed relay is straightforward and easy to understand. By following the diagram, you can connect the relay to your circuit and use it to control your load. We hope this article has provided you with the information you need to use a 12v normally closed relay in your projects.
