Relays are an important component used in many electrical circuits. Among the different relay types, the 4-prong relay is one of the most commonly used ones due to its versatility and simplicity in design. In this blog post, we will be discussing the basics of the 4-prong relay and its wiring diagram.
4 Prong Relay Basics
A 4-prong relay has four pins or terminals labeled as Normally Open (NO), Normally Closed (NC), Common (COM), and Control or Coil. The NO and NC pins are used as switch contacts while the COM and Control pins are used to activate the relay's switch contacts. The NO pin is open or not connected when the relay is not activated while the NC pin is connected to the COM pin.
The Control or Coil pin is used to activate or turn off the switch contacts by applying a voltage. When a voltage is applied to the Control pin, it creates a magnetic field that pulls the switch contacts to the NO pin, breaking the circuit between the NC and COM pins. When the voltage on the Control pin is removed, the magnetic field disappears, and the switch contacts return to the NC pin, closing the circuit between the NC and COM pins.
4 Prong Relay Wiring Diagram
The 4-prong relay wiring diagram specifies the connections required to operate the relay correctly. Let's take a look at a few of the most common 4-prong relay wiring diagrams.
The image above shows a basic 4-prong relay wiring diagram. The Control or Coil pin is connected to an input voltage source while the NC and COM pins are connected in series to a load or device. When the relay is not activated, the circuit between the NC and COM pins is closed, allowing current to flow through the load. When the relay is activated, the circuit between the NC and COM pins is opened, stopping the current flow.
The second image shows a more complex 4-prong relay wiring diagram. This diagram shows how to use two relays to control a single device or load. The Control or Coil pins of both relays are connected to an input voltage source while the NC and COM pins of both relays are connected in series to the load. Each relay is controlled by a separate switch or circuit, allowing for more precise control of the load.
Conclusion
In conclusion, the 4-prong relay is a versatile and widely used component in many electrical circuits. Its simple design and basic wiring diagram make it easy to understand and use, even for those new to electronics. By understanding the basics of the 4-prong relay and its wiring diagram, you can design and build your own relay-controlled circuits and projects.
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