I couldn't resist a look at the innards. Terms 4,5 activate relay K-201 coil. When relay is activated, pushee-1 connection to NC pushee-3 is switched to NO pushee-2. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20190105/caa85a21/attachment-0001.html>