Micro Switch Wiring Diagram

Micro switches are a common component in many electrical devices. They are utilized to detect the presence or absence of an object and determine its position. Micro switches are also used as limit switches for doors, elevators, and other devices. In this article, we will discuss the wiring diagram for a micro switch and its various components.

What is a Micro Switch?

A micro switch is a type of switch that operates on a small scale. It is also known as a snap-action switch, miniature switch, or limit switch. The switch consists of a lever that is actuated by a small force, typically from a mechanical movement or physical contact. The lever is connected to a set of electrical contacts that open or close when the switch is triggered.

Micro switches are commonly used in many applications ranging from home appliances to aerospace. They are durable, reliable, and have a long lifespan. They are also affordable and easy to install.

Micro Switch Wiring Diagram

The wiring diagram for a micro switch is simple and straightforward. The micro switch consists of three terminals: common (COM), normally open (NO), and normally closed (NC). The common terminal is connected to the power source or ground, and the NO and NC terminals are connected to the load.

To wire a micro switch, the first step is to identify the type of switch you have. Most micro switches have a lever that actuates the switch when it is pressed or released.

Wiring a Normally Open Micro Switch

A normally open micro switch is a switch that remains open until it is actuated. When the switch is actuated, it closes and completes the circuit. To wire a normally open micro switch, follow these steps:

  1. Connect the common terminal (COM) to the power source or ground.
  2. Connect the normally open (NO) terminal to the load.
  3. Leave the normally closed (NC) terminal unconnected.

When the switch is actuated, the circuit is completed, and the load is powered.

Wiring a Normally Closed Micro Switch

A normally closed micro switch is a switch that remains closed until it is actuated. When the switch is actuated, it opens and breaks the circuit. To wire a normally closed micro switch, follow these steps:

  1. Connect the common terminal (COM) to the power source or ground.
  2. Connect the normally closed (NC) terminal to the load.
  3. Leave the normally open (NO) terminal unconnected.

When the switch is actuated, the circuit is broken, and the load is powered off.

Wiring a Changeover Micro Switch

A changeover micro switch is a switch that can be used as either a normally open or normally closed switch. To wire a changeover micro switch, follow these steps:

  1. Connect the common terminal (COM) to the power source or ground.
  2. Connect the normally open (NO) terminal to one side of the load, and the normally closed (NC) terminal to the other side of the load.

When the switch is actuated, the circuit is either opened or closed, depending on the configuration.

Components of a Micro Switch

Micro switches are composed of several components that work together to detect and actuate the switch. Understanding these components is essential when wiring a micro switch. The components of a micro switch include:

  • Actuator: This is the part of the switch that is physically actuated to trigger the switch.
  • Contact Block: This is the part of the switch that contains the electrical contacts.
  • Spring: This is the part of the switch that provides the force to return the switch to its original position.
  • Housing: This is the part of the switch that contains all the components and provides protection from the environment.

FAQ

1. What is the voltage rating of a micro switch?

The voltage rating of a micro switch varies depending on the type and model of the switch. Most micro switches have a voltage rating ranging from 3VDC to 250VDC.

2. Can a micro switch be used in a high-temperature environment?

Yes, micro switches can be used in high-temperature environments. However, it is essential to choose a switch that is rated for the specific temperature range of the application.

3. How long does a micro switch last?

The lifespan of a micro switch depends on various factors such as the application, usage, and environment. Generally, micro switches have a lifespan of over one million cycles.

4. How do I know if a micro switch is working correctly?

To test if a micro switch is working correctly, you can use a multimeter to check for continuity or resistance. You can also test the switch by actuating it and checking if it triggers the load.

5. Can a micro switch be used in a DC circuit?

Yes, micro switches can be used in DC circuits. However, it is essential to choose a switch that is rated for the specific voltage and current of the DC circuit.

Conclusion

Micro switches are essential components in many electrical devices. Wiring a micro switch is easy and straightforward, and it requires simple knowledge of its wiring diagram and components. Understanding the components and wiring diagram of a micro switch is crucial to ensure it operates correctly and reliably.

Terminals Description
COM Common Terminal
NO Normally Open Terminal
NC Normally Closed Terminal