Siemens Building Technology 540-660B Sensor 318973-401 Enhanced Airflow Efficiency: Forward-curved blade

Enhanced Airflow Efficiency: Forward-curved blade geometry provides superior air movement for consistent climate control and HVAC part performance

1 1/8" ODT x 1 1/8" ODF copper connections for secure

The 667715902 75VA transformer is often used as a more robust upgrade for systems where 40VA units frequently fail due to control circuit overloading

the SP13845D provides consistent manifold pressure

as capacitors are often sold separately or integrated depending on the production year

Siemens Building Technology 540-660B Sensor 318973-401 Enhanced Airflow Efficiency: Forward-curved bladeThe Siemens 540 660B Sensor is a staple 10K Ohm NTC thermistor designed for precision environmental monitoring in commercial HVAC applications. Engineered for seamless integration with Siemens Terminal Equipment Controllers (TEC) and LONMARK compliant systems, this Type II NTC thermistor offers a reliable sensing range from 55F to 95F. As a veteran grade wall mount room temperature sensor, it features an integrated set point slide and a flush mounted