LIMIT SWITCH & MICROSWITCH CONNECTION 

                                            Types  limit switches:

There are 4 general types of limit switches:

1. Whisker

2. Roller

3. Lever

4. Plunger

Depending on the application, a limit switch may be a combination of 2 of the general types such as roller-lever.

What are limit switches?

A limit switch is an electromechanical device operated by a physical force applied to it by an object.

Limit switches are used to detect the presence or absence of an object.

These switches were originally used to define the limit of travel of an object, and as a result, they were named Limit Switch.

Limit switches applications:

When you open the fridge door, a light comes on inside. How does that happen? Yes…. you guessed it! A limit switch is used to detect if the fridge door is open or closed.

Let’s look at another application of a limit switch that you may encounter at home. On many overhead garage doors, there is a limit switch that stops the movement of the door when it reaches its fully opened position.

now that we’ve looked at a couple of limit switch applications where you might see them in action at home, let’s have a closer look at the device itself.

Limit switches are electromechanical devices consisting of an actuator mechanically linked to an electrical switch.

When an object contacts the actuator, the switch will operate causing an electrical connection to make or break.

Microswitch

Let’s have a look inside a microswitch that is a type of limit switch.

A microswitch has 2 limit switches operating together and sharing a common terminal. One limit switch is normally open and the other is normally closed. 

To be technically correct, the switch configuration is Single Pole Double Throw, or commonly referred to as SPDT.

The dashed line indicates that both switches are mechanically connected and will operate at the same time.