Wednesday, May 23, 2018

IAM Search

Discrete Process Measurement - Hand Switches

A hand switch is exactly what the name implies: an electrical switch actuated by a person’s hand motion. These may take the form of toggle, pushbutton, rotary, pull-chain, etc. A common form of industrial pushbutton switch looks something like this:

 

an industrial push button switch showing its contacts at its terminals

The threaded neck inserts through a hole cut into a metal or plastic panel, with a matching nut to hold it in place. Thus, the button faces the human operator(s) while the switch contacts reside on the other side of the panel.

When pressed, the downward motion of the actuator breaks the electrical bridge between the two NC contacts, forming a new bridge between the NO contacts:

 
An industrial push button switch on its actuated state.

The schematic diagram symbol for this type of switch looks much like the real thing, with the normally-closed contact set on top and the normally-open contact set below:

A normally closed contact symbol at its normal state
 
 
Click here to continue reading to the next page, Limit Switches

Click here to go back to page 1 on Discrete Process Measurement

Go Back to Lessons in Instrumentation Table of Contents

Comments (0)Add Comment

Write comment

security code
Write the displayed characters


busy

Promotions

  • ...more

Disclaimer

Important: All images are copyrighted to their respective owners. All content cited is derived from their respective sources.

Contact us for information and your inquiries. IAMechatronics is open to link exchanges.

IAMechatronics Login