The 26MA1B0 is a general purpose low water cut-off SPDT plug-in module that has a power rating of 1/3 HP, 120V, 10A, and 50/60 Hz frequency.  It has a 3-second time delay, and a 4,700-ohm sensitivity with -40°F to 150°F (-40°C to 65°C) ambient temperature range.  UL-listed & recognized.

The plug-in module is suitable for boiler low-water cutoff, point level, and alarm applications.  It is designed with solid-state components, a clear Lexan plug-in style enclosure, and an LED status indicator that shows the state of the controller for quick monitoring.  

The 26MA1B0 module is constructed with an 11-pins that can be easily installed on a vertical or horizontal surface with the included DIN mount socket.  The Littlefuse OT11PC socket 11-pin replacement part is also available