we recommend verifying your system's serial number with a professional to determine if additional flow control components are required

3-Pole Configuration: Provides comprehensive power isolation for three-phase HVAC systems

ensuring the system guides airflow correctly for precise temperature control

Does this kit include orifices for high-altitude installations

Does this switch support low-ambient operation

Siemens Building Technology 540-680FB Sensor 321894-709 we recommend verifying your system'sTechnical professionals requiring precise zone control should look to the Siemens Building Technology 540 680FB Sensor. This Series 1000 Room Temperature Sensor is engineered specifically for seamless integration with Siemens Terminal Equipment Controllers (TEC) and LonMark compliant LTEC systems. Utilizing a 10K Ohm Type 2 Thermistor, it provides a stable resistance output for accurate environmental monitoring. The unit features a white enclosure