Look for switches like these at Newark/Farnell/Element14, RS, whomever your favorite supplier is. Connect up the Common and NC (normally closed) contacts. Read their data sheet to see what temperature they are rated for.
Look for switches like these at Newark/Farnell/Element14, RS, whomever your favorite supplier is. Connect up the Common and NC (normally closed) contacts. Read their data sheet to see what temperature they are rated for.