A relay is an electronic device that acts as a switch to control the flow of electricity. Relays are commonly used in automotive, industrial, and household applications. The five terminal relay is one of the most popular types of relays used in the automotive industry. In this article, we will discuss the wiring diagram for a 5 terminal relay and its applications.
What is a 5 Terminal Relay?
A 5 terminal relay has five terminals or connections that are used to control the flow of electricity. The five terminals are:
| Terminal Number | Terminal Name |
|---|---|
| 30 | Battery Power |
| 85 | Ground |
| 86 | Control |
| 87 | Output |
| 87a | Normally Closed Output |
The battery power terminal (30) is used for connecting the power source. The ground terminal (85) is used for grounding the relay. The control terminal (86) is used for switching the relay on or off. The output terminal (87) is used for connecting the load or device that needs to be controlled. The normally closed output terminal (87a) is used for connecting an alternate load or device that needs to be turned off when the relay is activated.
Wiring Diagram for a 5 Terminal Relay
The wiring diagram for a 5 terminal relay is quite simple. Here is the wiring diagram:
As you can see, the power source is connected to terminal 30 and the load or device is connected to terminal 87. The control terminal (86) is connected to a switch or a sensor that controls the relay. The ground terminal (85) is connected to the ground or the chassis of the vehicle or the device.
Applications of a 5 Terminal Relay
A 5 terminal relay can be used in a variety of applications. Here are some common applications of a 5 terminal relay:
1. Headlights and Fog Lights
A 5 terminal relay can be used to control the headlights and fog lights of a vehicle. The relay can be activated by a switch or a sensor that detects the ambient lighting conditions. When the relay is activated, it turns the headlights or the fog lights on or off. This helps to improve the visibility of the driver and the safety of the vehicle.
2. Fuel Pump
A 5 terminal relay can be used to control the fuel pump of a vehicle. The relay can be activated by the ignition switch or a sensor that detects the engine speed. When the relay is activated, it turns the fuel pump on or off. This helps to ensure that the engine receives the proper fuel supply and prevents fuel leakage and fire hazards.
3. Cooling Fan
A 5 terminal relay can be used to control the cooling fan of a vehicle. The relay can be activated by a temperature sensor or a switch that detects the engine temperature. When the relay is activated, it turns the cooling fan on or off. This helps to prevent engine overheating and damage.
4. Horn
A 5 terminal relay can be used to control the horn of a vehicle. The relay can be activated by a push button or a switch that is connected to the steering wheel. When the relay is activated, it turns the horn on or off. This helps to alert other drivers and pedestrians and prevent accidents.
5. Power Windows
A 5 terminal relay can be used to control the power windows of a vehicle. The relay can be activated by a switch that is connected to the power window control panel. When the relay is activated, it supplies power to the power windows and enables them to open or close. This helps to improve the comfort and convenience of the passengers.
FAQs
1. What is a relay?
A relay is an electronic device that acts as a switch to control the flow of electricity. Relays are commonly used in automotive, industrial, and household applications.
2. What is a 5 terminal relay?
A 5 terminal relay has five terminals or connections that are used to control the flow of electricity. The five terminals are: battery power, ground, control, output, and normally closed output.
3. What is the wiring diagram for a 5 terminal relay?
The wiring diagram for a 5 terminal relay is quite simple. The power source is connected to terminal 30 and the load or device is connected to terminal 87. The control terminal (86) is connected to a switch or a sensor that controls the relay. The ground terminal (85) is connected to the ground or the chassis of the vehicle or the device.
4. What are the applications of a 5 terminal relay?
A 5 terminal relay can be used in a variety of applications, including headlights and fog lights, fuel pump, cooling fan, horn, and power windows.
5. How does a relay work?
A relay works by using an electromagnetic coil to control the movement of a switch or contact. When the coil is energized, it creates a magnetic field that pulls the switch or contact towards it, thereby completing the circuit and allowing the flow of electricity. When the coil is de-energized, the switch or contact returns to its original position, thereby breaking the circuit and stopping the flow of electricity.
