Markel Products Co. ET9S4TS Single Pole Thermostat 35°-75°F

The Markel Products Co. ET9S4TS Single Pole Thermostat is a line-voltage, heat-only control part designed for temperature regulations in HVAC systems. It operates within a 35°F to 75°F setpoint range and uses a 120-277V supply with a 22A resistive load rating, allowing it to switch electric heating circuits accuratly under the standard operating conditions. The unit features a single-pole snap-action bimetal mechanism for on/off control and includes a built-in thermometer for the local temperature reference. Installed in wall-mounted or unit heater applications, it operates as a primary heating control component.