Wait guys
Most START/STOP stations are designed for use with contactors with AUXILLARY CONTACTS. This is discussed here:
https://www.google.com/url?sa=t&rct...lQSyBMHOFNLKsHw&bvm=bv.49784469,d.dmg&cad=rja
A contactor for 240 V would have two poles for the 240 and a small pilot rated contact as the AUX contact. That AUX contact is closed when the relay is closed. That contact is wired in parallel to the momentary START switch. Thus once presses the start switch is continuously on until you loose power.
Now, if you wire that parallel combination to a power source and the relay coil, you can turn it on, but ont off. Insert a NC PB in series with the relay coil and presto: ON/OFF Start Stop control with drop on power failure.
Overloads complicate the wiring a bit, but not much,
Most of the motor starters I wired had a switch for.
OFF/ON/(Start/Stop)
so they could function as always on, always off or use the start stop buttons.
They were all fitted with a solid state motor starter later.
Earlier, I used a phase reversal relay with delays for autostart and phase problems.
Agreed, this was costly, but not as costly as loosing the pump or the process. It was used to protect a compressor in a 40K USD unit and pumps that cost $5K with considerable repair downtime.