Limit Switch

Q1. What is a limit switch?

A limit switch is an electromechanical device that detects the presence, absence, or position of an object by making or breaking an electrical connection when the object comes in contact with the actuator.

Q2. How does a limit switch work?

When an object (or machine part) physically contacts the actuator of the switch, the internal contacts open or close, sending a signal to control circuits for further action (stop/start/limit).

Q3. What are the advantages of using limit switches?

Regularly check for mechanical wear and alignment

Keep free from dust, oil, and moisture

Inspect wiring and terminals for looseness

Replace worn-out actuators or damaged switches

Q4. What are the limitations of limit switches?

Requires physical contact (mechanical wear over time)

Limited speed of operation

Not suitable for high-precision or very fast applications

Q5. How do I maintain a limit switch?

Regularly check for mechanical wear and alignment

Keep free from dust, oil, and moisture

Inspect wiring and terminals for looseness

Replace worn-out actuators or damaged switches

Q6. What are the main types of limit switches?

Plunger Type – activated by direct pressing.

Replace worn-out actuators or damaged switches

Whisker/Lever Arm Type – for irregular object detection.

Rotary Type – for angular motion sensing.