Relay wiring diagrams are important for ensuring the proper functioning of electrical equipment. In this article, we will be discussing the 5 pin relay wiring diagram 87a. This is a commonly used relay and it is important to understand its wiring diagram. We will be explaining the various aspects of the wiring diagram in an easy to understand manner.
What is a 5 Pin Relay?
A 5 pin relay is an electrical component that is used to control an electrical circuit. It has five pins: two for the coil and three for the contacts. The coil pins are used to connect the relay to the power source and ground. When voltage is applied to the coil, it creates a magnetic field that pulls in the contacts. The contacts are used to open or close an electrical circuit.
In the case of the 5 pin relay wiring diagram 87a, pin 87a is a normally closed (NC) contact. This means that when the relay is not energized, pin 87a is connected to pin 30. When the relay is energized, pin 87a disconnects from pin 30 and connects to pin 87.
Wiring Diagram
The 5 pin relay wiring diagram 87a is shown below:
| 5 Pin Relay Wiring Diagram 87a | |
|---|---|
| Pin | Description |
| 85 | Connect to ground |
| 86 | Connect to a switched power source |
| 30 | Connect to the power source |
| 87 | Connect to the load |
| 87a | Normally closed (NC) contact, not used in all applications |
As can be seen from the wiring diagram, pin 87a is connected to pin 30 when the relay is not energized. When the relay is energized, pin 87a disconnects from pin 30 and connects to pin 87. Pins 85 and 86 are used to control the coil of the relay.
FAQ
What is the purpose of a relay?
A relay is used to control an electrical circuit. It is often used to switch high current or high voltage devices on and off using low current signals.
What is a normally closed contact?
A normally closed contact is a contact that is closed when the relay is not energized. When the relay is energized, the contact opens.
Is pin 87a used in all applications?
No, pin 87a is not used in all applications. It is only used when a normally closed contact is required.
What is the difference between a 4 pin and 5 pin relay?
A 4 pin relay has four pins: two for the coil and two for the contacts. A 5 pin relay has five pins: two for the coil and three for the contacts. The additional contact is usually a normally closed contact.
Can a 5 pin relay be used in place of a 4 pin relay?
Yes, a 5 pin relay can be used in place of a 4 pin relay. The additional contact is not required in all applications.
Conclusion
The 5 pin relay wiring diagram 87a is an important diagram to understand for those working with electrical equipment. We have explained the various aspects of the wiring diagram in an easy to understand manner. Understanding relay wiring diagrams is important for ensuring the proper functioning of electrical equipment.
