Relays are electromagnetic switches that can open or close circuits electronically. They are often used in automotive, industrial, and household applications where a low voltage circuit needs to control a high voltage circuit. A relay has four poles, which means it has four contacts for different circuits. In this journal article, we will discuss the 4 pole relay wiring diagram and how it can be used in various applications.
What is a 4 Pole Relay?
A 4 pole relay is an electromechanical device that has four electrically isolated contacts or poles. Each pole can make or break an individual circuit. The relay operates on the principle of changing the state of a magnetic field when a current is passed through its coil. The magnetic field then attracts or repels the pole of the relay, which makes or breaks the circuit.
The four poles of the relay are labeled as NO (normally open), NC (normally closed), C (common), and CO (changeover). The NO and NC poles are used to create on or off state in a circuit. The C pole is used to connect the common terminal of the input and output circuits. The CO pole is used when there is a need to switch between two circuits.
Wiring a 4 Pole Relay
Wiring a 4 pole relay is a straightforward process. The relay has four connection points or pins, labeled as 85, 86, 87, and 30. Pin 85 is used to connect the relay coil to a power source. Pin 86 is used to connect the coil to a ground source. Pin 87 and 87a are the output contacts, which are normally open and normally closed respectively. Pin 30 is the input contact, which is used to connect to the controlled device.
Here is the wiring diagram for a 4 pole relay:
| PIN | DESCRIPTION | WIRE COLOR |
|---|---|---|
| 85 | Coil Positive | Red |
| 86 | Coil Negative | Black |
| 87 | Normally Open Output | Yellow |
| 87a | Normally Closed Output | Blue |
| 30 | Input | Green |
The coil of the 4 pole relay is connected to a power source, which can be DC or AC. The ground connection of the coil is connected to a ground terminal of the power source. The input contact (30) of the relay is connected to the controlled device or load, such as a lamp or fan. The normally open contact (87) is connected to the positive supply of the load. The normally closed contact (87a) is connected to the negative supply of the load.
Applications of 4 Pole Relays
4 pole relays are used in various applications in different industries. Here are some of the typical applications of 4 pole relays:
Automotive Industry
4 pole relays are used in automotive applications to control the power flow to various electrical components such as lights, fans, wipers, and motors. They are also used in alarm systems, power windows, and central locking systems.
Industrial Sector
4 pole relays are used in industrial machines and equipment to control the power supply to different devices. They are used in conveyor belts, mixers, compressors, and packaging machines. They are also used in safety systems such as emergency stop circuits, interlock systems, and machine guarding.
Household Applications
4 pole relays are used in household applications to control the power supply to different devices such as lights, fans, and appliances. They are also used in security systems, doorbells, and heating systems.
Frequently Asked Questions (FAQ)
Q. What is the difference between a 4 pole relay and a 5 pole relay?
Ans. The main difference between a 4 pole relay and a 5 pole relay is that the 5 pole relay has an additional pole called the auxiliary (Aux) pole. The Aux pole is used to switch between two circuits without disturbing the existing circuit. The 4 pole relay does not have this additional pole.
Q. How to test a 4 pole relay?
Ans. To test a 4 pole relay, you can use a multimeter to check the continuity of the poles. You can also check the resistance values of the coil to determine if it is working correctly. You can connect the coil to a power source and see if it gets activated and creates a magnetic field that switches the poles.
Q. Can a 4 pole relay be used in a three-phase motor?
Ans. Yes, a 4 pole relay can be used in a three-phase motor to control the power supply to the motor. However, you need to use multiple relays to control each phase of the motor.
Q. Can a 4 pole relay be used in a high voltage circuit?
Ans. Yes, a 4 pole relay can be used in a high voltage circuit to control the power supply. However, you need to ensure that the relay is designed and rated for the specific voltage and current requirements of the circuit.
Q. Can a 4 pole relay be used in a low voltage circuit?
Ans. Yes, a 4 pole relay can be used in a low voltage circuit to control the power supply. However, you need to ensure that the relay is designed and rated for the specific voltage and current requirements of the circuit.
Conclusion
A 4 pole relay is a useful device that can control the power flow to different circuits. It has four poles that can make or break an individual circuit. In this journal article, we have discussed the 4 pole relay wiring diagram and its applications. The wiring process is straightforward, and the relay can be used in various industries such as automotive, industrial, and household applications. We hope this article has provided you with valuable information about 4 pole relays.
