Does anybody knows if safety pressure switches (redundant contact...) exist on the market??

 

Have you Googled "safety+pressure+switches"? (The quotation marks and plus signs help to narrow the search results to those which most closely match the query.)

If your question is understood correctly, there are many manufacturers of pressure switches with redundant (multiple) sets of contacts. One manufacturer which comes immediately to mind is Custom Control Sensors (www.ccsdualsnap.com, or www.ccsdualsnap.co.uk); their switches come in several different configurations.

But there are many others; check the Google results.

However, utilizing two sets of contacts for redundancy in a single pressure switch still allows for a single point of failure....if that's what you're trying to avoid, this won't do it.

Exactly what are you trying to accomplish? What is the application? You'll get better responses if you provide more information. And Google is a much faster resource for questions like this with so little information.

markvguy