A basic float switch to control a pump for tank filling or tank emptying. Levels can be achieved by positioning the two weights to give a differential of 50mm to 1000mm.
110v 10 Amp Max or 230v 7.5 Amp Max Inductive loads, can be used for pump control. If pump inductive load is higher then a contactor/starter/control panel must be used. Same applies for applications for three phase pumps.