The Wet Switch is a solid state device designed to detect the presence of condensate water overflow. The Wet Switch is placed into the secondary drain pan - a normally dry pan. If the primary drain pan fails, condensate water will overflow into the secondary drain pan. Upon sensing moisture, the Wet Switch will turn the system off (typcially the cause of the condensing water) to help prevent damage to carpets, walls, woodwork, ceilings, and other property.
The Wet Switch is designed to interrupt the operation of cooling systems. However, it is a water activated switch and can be used in a variety of other applications.