Thanks bubb1957 again for the reply. I have not made the decision (levelguard) yet and wondered if you might be able to relate some specifics of your experience with the Vertical Master Switch. Can you tell me approximately how long one lasts in your application? Can you tell me how frequently it cycles. With a 6 inch drop, my pit will typically cycle every 5 to 7 minutes which gives me the 100k per year I mentioned.
Mechanically, a switch like that should last a million cycles or more. The limiting factor is the inrush current on start up. If the contacts are underdesigned, (e.g. using 1/4 hp contacts in a 1/2 hp application), they will erode, pit and frequently weld together resulting in switch failure. Achieving more than 100k cycles under these conditions was unusual with less than 50k more typical.
I see it is rated at 1/2 hp and 60 amps starting current. I have seen inductive motor loads draw inrush in the 90 to 100 amp range. Not sure what a pump like the Zoeller might actually draw. Regardless, your experience with the 'life' of this switch would be greatly appreciated.