How can I add a service disconnect between main panel breaker and load side
The electricians will be along shortly. My recommendation would be a &quot;non-fused safety switch&quot; that can be bought at any electrical store, Lowes, Home Depot, or most any hardware type store, as long as you are feeding the power from a circuit breaker from the main panel. You may be better off by running a heavy wire from the main panel breaker and adding a small circuit breaker panel in the shop area that can be further broken down into individual 120/240 volt circuits.  You wrote that (we have 2 lines, live and neutral wire) which needs to be better explained since you don't get 240 volts from 1 wire + a neutral. The electricians will explain your needs better than I can.