Siemens Building Technology RAA20U Thermostat Els PW 17895 the MT4 series track is

the MT4 series track is typically sold separately or as part of a larger enclosure assembly

whereas SPNO models only offer normally open switching

Its compact design facilitates straightforward mounting in tight furnace cabinets

Replacing a corroded or unbalanced inducer blower wheel with this factory-spec component eliminates the vibration and mechanical noise that often signals imminent inducer motor failure

Siemens Building Technology RAA20U Thermostat Els PW 17895 the MT4 series track isThe 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