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The Johnson Controls T-4002-303 Conversion Kit is a professional-grade solution designed for upgrading or replacing legacy pneumatic thermostats in commercial HVAC systems
it monitors the differential pressure to confirm the inducer motor is moving sufficient combustion air
While it is an OEM fit
For calculation of drive ratios
Siemens Industrial Controls 3RU2136-4GB0 Relay 318973-401 The Johnson Controls T-4002-303 ConversionThe 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