Limit Thermostat Switch - 200F - Normally Closed, Open On Rise - 200F and below the electrical circuit will remain closed, 200F and up will open the electrical circuit. Automatic Reset - 3/4" Diameter.  For use on furnaces, air handlers, dryers, fans, dishwashers, package units, heaters,  limits, ect., U.L.Rated, #L200. These limit thermostats are brand new and made by Napcous Corp.