this module provides the safety

the Trane SWT03073 prevents unsafe operation by interrupting the heating cycle if it detects restricted venting or inducer failure

It is commonly found in Trane Voyager and Precedent light commercial units

5 foot) wire harness for direct hardwiring

Siemens Building Technology 533-380-24 Temperature Sensor 326010-701 this module provides the safetyThe Siemens 533 380 24 is a professional grade duct averaging temperature sensor designed for precise climate monitoring in commercial HVAC systems. This unit features a 24 foot flexible probe, making it the standard choice for large air handling units (AHUs) where air stratification often leads to inaccurate readings from single point sensors. Utilizing a 100 Ohm Platinum RTD (Pt100) sensing element, the 533 380 24 provides a reliable 4 20mA output