Siemens Building Technology 540-660B Sensor 318973-401 This model features an integrated

This model features an integrated Over-Pressure Device (OPD)

a lack of continuity indicates the switch is stuck open and needs replacement

Field Efficiency: Direct-replacement design minimizes labor time and reduces the risk of troubleshooting callbacks

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

providing superior protection against corrosion and moisture in mechanical rooms

Siemens Building Technology 540-660B Sensor 318973-401 This model features an integratedThe 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