Good stuff. Sounds like brand/type of disconnect doesn’t really matter provided it has the right amp rating.
WRONG!
Your electrician better read 2020 NEC 230.85 very carefully...
"For one- and two-family dwelling units, all service conductors shall terminate in disconnecting means having a short-circuit current rating equal to or greater than the available fault current, installed in a readily accessible outdoor location. "
I doubt any non fuseable 2 pole safety disconnect switch will meet this requirement. A 22kA breaker would though. (22,000 Amps). Like I said earlier it shall be rated and Listed for use as service equipment...
Also I imagine your electrician will use 230.85 (3) wiring scheme and Label the disconnecting means,
(3) Other listed disconnect switches or circuit breakers on the supply side of each service disconnect that are suitable for use as service equipment and marked as follows: “EMERGENCY DISCONNECT, NOT SERVICE EQUIPMENT”
EMERGENCY DISCONNECT, NOT SERVICE EQUIPMENT
I would strongly suggest the electrician check with the Utility Power Co, Electrical Inspector, Electrical Wholesale Supply House for what meets the requirement for your area before he buys anything.
Jim