Disconnect switches are used anywhere a local disconnect is required or desired. Often they are used where the motor is not visible from the motor controller, or MCC. These can be found in all locations in a water wastewater facility including screw pumps, mixers, blowers, oxidation ditch rotors, headworks, and biosolids to name a few. General duty is used where economy is a prime consideration, and Heavy duty is used where maximum performance and continuity of service are of prime consideration.