"Ignoramus9394" wrote in message
...

SNIP

If so, then, logically, I need to install similar relays on single
phase equipment as on 3 phase equipment. And yet no one does this with
single phase equipment.



This IS done on at least some single phase equipment....My Delta Unisaw has
a magnetic switch that works that way. If power is lost, the relay drops out
and the saw will not restart when power is restored, until ya press the
button again.

I guess the idea is that the machine may not get turned off when power
fails, and you may not be around when power returns.....


Posted FWIW....

Jeff