Three Precision compatible brackets allow direct replacement in all NEMA I and NEMA III enclosures of all popular models. There are no exposed gears that can cause premature motor failure. In addition, Precision replacement time switches run quieter. Each unit is tested under full load and run for 4 hours to ensure all elements are in perfect condition. Finally, all timers are shipped in NEMA III (rain-tight) non-conductive enclosures.