Gems® Series 26M Low-Water Cutoff Plug-In Module is designed for low-water cutoff protection. It features powered contacts, a modular plug-in design, solid state reliability, and a low voltage sensor. It meets CSD1 requirements for boiler low-water cutoff and is considered to have U.L. "Limit Control." If your application is needing more, the 26M series has many add-on options such as power outage features, manual reset button, or dirty electrode detection.