I'm working on a 60 kW project and we're installing a 400 A fused disconnect with 400 A fuses for our utility disconnect of the PV array. The service voltage is 208/120 Three phase so either a general or a heavy duty disconnect meets my voltage and current requirements. Is there any reason to use the heavy duty disconnect? I don't imagine the disconnect will be switched more than a couple times a year if that so I don't see a reason to use the heavy duty disconnect to allow for more switching actions over the lifetime of the system. Is there any other reason I should use heavy duty instead of general duty for my disconnect? The project is for a facilities maintenance building...