Normally Open (N/O) Logic: Integrated safety design prevents startup if the switch is stuck in a closed position at the beginning of the cycle

and CWN series

field-proven sensor is necessary

Precise Thermal Calibration: Features a factory-set 240-degree Fahrenheit thermal cutout to protect the heat exchanger from damage

Enhanced Safety: Acts as a primary fail-safe to interrupt power to the gas valve or ignition control if temperatures exceed the safety threshold

Siemens Building Technology RAA20U Thermostat Els PW 17895 Normally Open (N/O) Logic: IntegratedThe Siemens RAA20U Thermostat is a high performance mechanical solution designed for precision temperature control in heating only or cooling only applications. Functioning as a two wire, gas diaphragm based room thermostat, this unit offers a reliable two position (on off) control algorithm suitable for both 24V low voltage and line voltage systems (24 to 277 Vac). As a veteran technician knows, the Siemens RAA20U is the direct replacement for 1A10