Tried & True
I used these many years ago, so I am familiar with them. That is mainly why I chose them. They are heavy duty, and the most important thing is that the contacts can be normally open, or switched around to be normally closed. They are heavy duty, but since they have been around so long, there are plenty available at a good price. You can also add a top deck to give yourself 8 sets of contacts. If you look around, there are timer decks. and other options. For me, I am just using them to lock out a VFD so I can safely handle the spindle of my knee mill.
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