Thank you for your interest in Sump Pumps Direct, Frank!
The ratings listed for the Basement Watchdog, like all other piggyback float switches that we offer, refer to the pump running amps. MOST are rated for 120V.
The water would need to raise about another 2-3/4 inches if the bottom float does not activate the pump.
The "cage" dimensions for the floats are 5"L X 2-1/8"D.
If you have any other questions, please let me know.