Originally Posted by goybar
OK, so it really is more of a fail safe or safety item. Not really required but foolish not to use one.
I'd add that when SSR's fail, they usually fail closed - allowing full current to flow through them - regardless of what the control circuit is doing. Since we only need to control 1 leg of a 240v system a contactor is a requirement to ensure the circuit is off.
Your life is more important than $10 your going to save by not putting in a contactor or the $50 you'll save by not buying the next larger sized panel.