The Wet Switch is a solid state device designed to detect the presence of condensate water overlow. Upon sensing moisture, the Wet Switch will turn the system off to help prevent damage to carpet, walls, woodwork, ceilings and other property. The covered area can be expanded by connecting one or more Wet Switches in series. The Wet Switch also provides isolated relay contacts. This adds flexibility in installations with electronic control boards where breaking one lead from the transformer is not possible.