The 5 pole relay is a widely used electronic component in the automotive industry. It is commonly used to control high-current devices, such as electric fans, headlights, and fuel pumps. In this article, we will take an in-depth look at the 5 pole relay wiring diagram, how it works, and its applications.
What is a 5 Pole Relay?
A 5 pole relay is an electrically operated switch that opens and closes circuits using an electromagnet. It consists of a coil, a set of normally open (NO) and normally closed (NC) contacts, and a common contact. The coil is energized when a voltage is applied to it, which causes the contacts to change their state. The NO contact opens, and the NC contact closes, or vice versa, depending on the circuit’s design.
The 5 pole relay has five terminals – two for the coil and three for the contacts. The terminals are usually marked as follows:
| Terminal | Description |
|---|---|
| 85 | Connects to the coil’s ground |
| 86 | Connects to the coil’s positive side |
| 87 | Connects to the device that the relay controls (NO contact) |
| 87a | Connects to the device that the relay interrupts (NC contact) |
| 30 | Connects to the power source |
5 Pole Relay Wiring Diagram
The following diagram shows a typical 5 pole relay wiring diagram:
In this diagram, the relay controls an electric fan. The power source connects to terminal 30 of the relay, and the fan connects to terminal 87. When the switch is closed, the coil is energized, and the contacts change their state. The fan turns on, and the NO contact connects the fan to the power source.
How the 5 Pole Relay Works
When a voltage is applied to the coil, it creates a magnetic field that pulls the movable contact toward the stationary contact. The stationary contact is connected to terminal 87 or 87a, depending on its state. When the movable contact touches the stationary contact, it completes the circuit between terminal 30 and the connected device. When the coil is de-energized, the spring returns the movable contact to its original position, which interrupts the circuit at terminal 87 or 87a.
Applications of 5 Pole Relay
The 5 pole relay is used in a wide range of applications, including:
- Electric fans
- Headlights
- Fuel pumps
- Horn
- Power windows
It is generally used to control high-current devices that would otherwise damage a switch or a fuse.
FAQs
Q: Can a 5 pole relay be used to control a DC motor?
A: Yes, a 5 pole relay can be used to control a DC motor. However, it is important to choose a relay with a suitable current rating to avoid damage.
Q: Can a 5 pole relay be used to control an AC device?
A: No, a 5 pole relay is not suitable for controlling AC devices. AC devices require a different type of relay, such as a solid-state relay.
Q: Can a 5 pole relay be used to control multiple devices?
A: Yes, a 5 pole relay can be used to control multiple devices by connecting them in parallel to the NO contact. However, it is important to choose a relay with a suitable current rating to avoid overload.
Q: Can a 5 pole relay be used to switch a high voltage?
A: Yes, a 5 pole relay can be used to switch a high voltage. However, it is important to choose a relay with a suitable voltage rating to avoid breakdown.
Q: Can a 5 pole relay be used as a timer?
A: No, a 5 pole relay is not designed to function as a timer. A timer relay, which has additional components such as capacitors and resistors, is required for such applications.
