Actually I was asking TR, but since you decided to show your ignorance of electricity;
They are not used in housing in pairs, those are 3-way switches, used to control lighting, etc from two locations.
Are you saying that a 3-way is not a single pole/double throw switch? Then what is it?
DP/ST switches are not center position off and these are only rated as high as 30 amp A/C power and used on water heaters.
Well DUH. If it’s SINGLE THROW, that’s ON/OFF. It would hardly need a second off position.
If your drawings are that good throw one up here and show the man how it should be done.
Well, if you insist but lets do a comparison.
This is the drawing you mailed me to scan for you. It was a starter drawing for an air compressor. Do you remember it?
You had the pressure switch shown normally open. It will never come on that way, so I fixed it for you.
No trickery these images were posted here
I also scanned the instructions you sent along with the drawing.
Note in #1, you state the pressure switch is “normally open” when the tank is empty.
In #7, you say to break the neutral to wire the pressure switch on that side of the coil. That just isn’t proper. I emailed you the scans and told you I didn’t want to get involved.
You told me to FIX them for you and post them as yours.
I replied that if I fixed them, they would be my drawing and instructions not yours.
This was what I was working on but never posted because it was too different from yours.