E48 is a part of Furnas, a range of components used in control systems manufactured by Siemens. Specifically, the E48 part is a line voltage thermostat. This thermostat is designed to control the line voltage of heating appliances, providing an accurate and reliable temperature control. It makes use of a solid-state switching circuit, which ensures fast and reliable response time. The E48 thermostat is designed to be used in a variety of industrial and commercial environments, such as restaurants, bakeries, factories, and other similar industrial settings.