I have a 1 hp submersible that fills a 10,000 gal. polytank. A separate 3/4 hp centrifugal pump (mounted outside the tank) draws out of the poly tank and fills a standard pressure tank. I have two float switches that (are supposed to) control the pumps. I wired the floats from a 24 vdc power supply for safety purposes. The 24 volt conductors from the float switches are connected to individual 240 V contactors that are wired to each pump. The system works great for turning on the pumps. Unfortunately, it appears that the contactors stay "latched" even when the 24 vdc drops out (when the float "opens"). Do I have the wrong type of contactor? Or do I need to replace the contactors with relays? Where would I find the correct ones? Thanks.