Relays are crucial components in electronic circuits. They serve as electrically controlled switches that can be used to turn devices on and off. One of the most common types of relays is the 12vdc relay. This article will provide a detailed guide on the 12vdc relay wiring diagram schematic. We’ll discuss how to wire a relay, its important components, its types, and provide FAQs related to relays.
What is a 12vdc Relay?
A 12vdc relay is an electromechanical switch that is activated by a low voltage signal. It comprises two essential components – a coil and contacts. The coil is responsible for creating a magnetic field, which closes the contacts and completes the circuit, while the contacts are responsible for turning the device on or off.
There are two major types of 12vdc relays, namely, SPDT (Single Pole Double Throw) and DPDT (Double Pole Double Throw). The SPDT relay has one set of contacts while the DPDT relay has two sets. The DPDT relay is more versatile and commonly used in electronic circuits.
Components of a 12vdc Relay
There are four basic components of a 12vdc relay – the coil, contacts, terminals, and the housing. The housing protects the relay from damage and provides insulation. The terminals are the points where the wires are connected. The coil creates a magnetic field when a voltage is applied, and the contacts close to turn the device on.
The contacts are divided into two types – normally open (NO) and normally closed (NC). The NO contacts are open when the relay is not activated, and the NC contacts are closed. When the relay is activated, the NO contacts close, and the NC contacts open, creating a break in the circuit.
12vdc Relay Wiring Diagram Schematic
Wiring a 12vdc relay is relatively simple. The first step is to identify the relay’s terminals. Most relays have five terminals, namely, Coil +, Coil -, NO, NC, and the Common terminal. The Coil + and Coil – terminals are where the voltage is applied to activate the relay. The Common terminal is where the power source is connected, and the NO and NC terminals are where the device is connected.
The wiring diagram for a 12vdc relay is as follows;
| Terminal | Description |
|---|---|
| Coil + | Connect to the positive terminal of the power supply |
| Coil – | Connect to the negative terminal of the power supply |
| NO | Connect to the device’s positive terminal |
| NC | Leave it disconnected if the device doesn’t require a “Normally closed” connection |
| Common | Connect to the negative terminal of the power supply and the device’s negative terminal |
FAQs
1. What is the difference between a SPDT and DPDT relay?
SPDT relay has one set of contacts, while the DPDT relay has two sets. The DPDT relay is more versatile and commonly used in electronic circuits.
2. What is the purpose of the NC (Normally Closed) terminal?
The NC terminal is used to create a break in the circuit when the relay is activated. It is helpful in creating safety circuits where power interruption is required in case of a fault.
3. What is the function of the Coil in a Relay?
The coil is responsible for creating a magnetic field, which closes the contacts and completes the circuit.
4. What is the purpose of the Common Terminal?
The Common terminal is where the power source is connected, and the NO and NC terminals are where the device is connected.
5. What type of power supply is required to activate a 12vdc relay?
A 12vdc relay requires a 12-volt power supply to activate its coil.
Conclusion
In conclusion, the 12vdc relay is a critical component in electronic circuits that serves as an electrically controlled switch. It is essential to understand the relay’s components, types, and how to wire them correctly to ensure their optimal performance. Hopefully, this article has provided an in-depth insight into the 12vdc relay wiring diagram schematic.
