Gems Series 26M is designed for low-water cutoff protection. This control meets CSD1 requirements for boiler low water cutoff. Series 26M features powered contacts. Modular plug-in design. Low voltage sensor. 11-Pin Socket. Solid state reliability. LED Monitoring. U.L. "Limit Control". Applicable for low-water cutoff, point level, alarms. 10K ohms direct sensitivity. 120 VAC voltage.