Jump to content
Electronics-Lab.com Community

Safety Capacitor

Guest Yevgenip

Recommended Posts

Guest Yevgenip

I've seen a cap being put in parallel with a switch's connectors to insure that the spark resulting from the switch would not damage the delicate components. My question is: How do I know what capacitor to use? i.e. What Voltage and Capacitance?


Link to comment
Share on other sites

This is an old (dates back to some time in the 1930's) technique of quenching switch contacts to protect them from arcing, pitting and poor service life.

Most generally, I've seen 0.1uF, ceramic disc capacitors used across the contacts of 120VAC power switches, with working voltage ratings from 250V to 1000V; which leads me to believe that anything over the peak voltage of the switched circuit will work just fine.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...