A 3 position switch is a mechanical device that is used to control different electrical circuits by selecting different positions. It is commonly found in household and industrial settings to control lighting, motors, and other electrical devices. In this article, we will discuss the wiring diagram of a 3 position switch and how it can be used to control different electrical circuits.
What is a 3 Position Switch?
A 3 position switch is a switch with three different positions: ON, OFF, and ON with a second circuit. The first position is for turning the device or circuit on, the second position is for turning it off, and the third position is for turning on a second circuit.
The ON with a second circuit position is commonly referred to as a momentary or spring return position. In this position, the switch is momentarily turned on and then returned to the previous position. This is useful for applications such as turning on a motor or activating a solenoid.
The 3 position switch can be used in a wide range of applications including lighting controls, HVAC controls, motor controls, and other industrial applications.
Now that we have a basic understanding of what a 3 position switch is, let’s take a look at the wiring diagram.
Wiring Diagram for a 3 Position Switch
The wiring diagram for a 3 position switch is relatively simple. It consists of three terminals labeled common (COM), normally open (NO), and normally closed (NC). These terminals are typically located on the bottom of the switch.
The common terminal is where power is supplied to the switch. The normally open terminal is connected to the common terminal when the switch is turned on, and the normally closed terminal is connected to the common terminal when the switch is turned off.
To wire a 3 position switch, you will need a basic understanding of electrical wiring and the necessary tools and materials. Here is a step-by-step guide to wiring a 3 position switch:
Step 1: Gather the necessary tools and materials
To wire a 3 position switch, you will need the following tools and materials:
| Tools | Materials |
|---|---|
| Screwdriver | 3 Position Switch |
| Wire Strippers | Wire Nuts |
| Wire Cutters | Electrical Tape |
| Multimeter | Electrical Wire |
Step 2: Turn off the power
Before you begin wiring the switch, make sure to turn off the power to the circuit you will be working on. This can be done by flipping the circuit breaker or turning off the power switch.
Step 3: Remove the old switch
If you are replacing an old switch, you will need to remove it from the wall or electrical box. Use a screwdriver to loosen the screws holding the switch in place and gently pull the switch out of the box.
Step 4: Identify the wires
Identify the wires coming from the circuit and the ones going to the switch. Use a multimeter to test the wires and determine which wires are hot (carrying voltage) and which ones are neutral (not carrying voltage).
Step 5: Connect the wires to the switch
Connect the hot wire to the common terminal on the switch. Connect the wire going to the device to be controlled to the normally open terminal. If the switch has a momentary or spring return position, connect the wire going to the second circuit to the normally closed terminal.
Step 6: Test the switch
Once you have connected the wires to the switch, turn the power back on and test the switch to make sure it is working properly.
Frequently Asked Questions (FAQs)
Q: What is the purpose of a 3 position switch?
A: A 3 position switch is used to control different electrical circuits by selecting different positions. It can be used in a wide range of applications including lighting controls, HVAC controls, motor controls, and other industrial applications.
Q: Can a 3 position switch be used to control multiple devices?
A: Yes, a 3 position switch can be used to control multiple devices by wiring them in parallel. This means that each device is connected directly to the switch and receives power when the switch is turned on.
Q: What is the difference between a 3 position switch and a 2 position switch?
A: The main difference between a 3 position switch and a 2 position switch is that a 3 position switch has a third position that allows for the control of a second circuit. A 2 position switch only has two positions: ON and OFF.
Q: What is a momentary or spring return position?
A: A momentary or spring return position is a position on a switch that is only momentarily turned on and then returned to the previous position. This is useful for applications such as turning on a motor or activating a solenoid.
Q: Can a 3 position switch be used to control a three-phase motor?
A: Yes, a 3 position switch can be used to control a three-phase motor by wiring it in a star-delta configuration. This allows the motor to start with reduced voltage and reduce the starting current.
Conclusion
In conclusion, a 3 position switch is a versatile device that can be used to control different electrical circuits by selecting different positions. It is commonly found in household and industrial settings to control lighting, motors, and other electrical devices. By following the wiring diagram and using the necessary tools and materials, you can easily wire a 3 position switch and control your electrical circuits with ease.
