The 12V diode relay is a crucial component in any electronic system that requires the switching of high currents or voltages. The relay provides an isolated switch that is controlled by an external circuit. In this article, we will discuss the wiring diagram of a 12V diode relay and how it can be used in various applications.
What is a 12V Diode Relay?
A diode relay is a type of relay that has a built-in diode. The diode is connected across the relay coil and provides protection against back EMF (electromotive force). When the relay is switched off, the back EMF can cause a high voltage to appear across the coil. This voltage can damage the relay and the driving circuit. The diode conducts and dissipates this voltage, protecting the relay and the circuit.
A 12V diode relay is a type of diode relay that operates on a 12V DC voltage. It is commonly used in automotive and industrial applications, where high currents and voltages are required to be switched.
Wiring Diagram
The wiring diagram for a 12V diode relay is shown below:
| Terminal | Description |
|---|---|
| 85 | Coil negative (-) |
| 86 | Coil positive (+) |
| 87 | Normally open (NO) contact |
| 87a | Normally closed (NC) contact |
| 30 | Common contact |
The coil terminals are connected to the external circuit that controls the relay. The normally open contact (87) is connected to the load that needs to be switched. The normally closed contact (87a) is not used in most applications. The common contact (30) is connected to the power source.
Applications
The 12V diode relay can be used in various applications where high currents and voltages need to be switched. Some common applications are:
Automotive Applications
The 12V diode relay is commonly used in automotive applications to control various functions such as lights, wipers, and horns. The relay provides a high current switch that can handle the demands of these functions.
Industrial Applications
The 12V diode relay is also used in industrial applications to switch high currents and voltages. It can be used to control motors, pumps, and valves. The relay provides an isolated switch that can be controlled by an external circuit.
Home Automation
The 12V diode relay can be used in home automation systems to control various appliances such as lights and fans. The relay provides a high current switch that can be controlled by a microcontroller or a smartphone app.
FAQ
1. What is the maximum current that a 12V diode relay can switch?
A 12V diode relay can switch currents up to 40A.
2. Can a 12V diode relay be used to switch AC voltage?
No, a 12V diode relay is designed to switch DC voltage only. If you need to switch AC voltage, you should use an AC relay.
3. Can a 12V diode relay be used to switch low currents?
Yes, a 12V diode relay can be used to switch low currents as well. However, it is recommended to use a smaller relay for low current applications.
4. How can I test a 12V diode relay?
You can test a 12V diode relay using a multimeter. Connect the multimeter to the coil terminals and check the resistance. If the resistance is within the specified range, the relay is working fine. You can also check the contacts using a continuity tester.
5. Where can I buy a 12V diode relay?
You can buy a 12V diode relay from electronic stores or online retailers such as Amazon or eBay.
In conclusion, the 12V diode relay is a crucial component in electronic systems that require the switching of high currents or voltages. It provides an isolated switch that can be controlled by an external circuit. The wiring diagram and applications of the relay have been discussed in this article. The FAQ section answers some common questions about the relay. We hope this article has helped you understand the 12V diode relay and its applications.
