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it monitors the differential pressure to confirm the inducer motor is moving sufficient combustion air
For calculation of drive ratios
While it is an OEM fit
Efficient Performance: Features a 1075 RPM operating speed at 1/3 Horsepower for optimal energy-to-airflow ratio
this bellows-type pressure switch ensures high reliability and ultra-short bounce times
Siemens Industrial Controls 3RU2136-4GB0 Relay 318973-401 it monitors the differential pressureThe Siemens 3RU2136 4GB0 is a high performance thermal overload relay engineered for heavy duty motor protection within HVACR and industrial control systems. Designed specifically for SIRIUS size S2 applications, this unit provides precise monitoring for motors with a current rating between 36 and 45 Amps. The Class 10 tripping characteristic ensures reliable downtime prevention by responding to overcurrent and phase failure conditions before