Potential Relay Replacement

[RyanG]

I am trying to change out some of the motor starting potential relays we use at work. I was wondering if it is doable in solid state form. The relay contacts burn out fairly quickly with the number of times the motors turn on and off, probably a few hundred to a thousand times in a day. The relays run  on 120vac across the contacts and coil, and they are normally closed. I attached a random schematic from google search, but it is basically the same as what I am dealing with. I thought about using triacs, but I don't really know if I can make one act as normally closed without some significant modifications to the current circuitry. Everything does have to be done with 120vac.

Here is a link to a relay that is almost exactly the same as the ones we use. Relay

[Ian.M]

If the motor's under 5HP, http://www.supco.com/supr&apr5.htm

[Jeroen3]

If you're really turning the motor on and off a lot I would use an VFD. It will also reduce the stress on the motor and shaft itself.

[RyanG]

How does this look?

Blue goes to my start capacitor and red goes to the start winding.