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ensuring the combustion blower is operational before the ignition sequence begins
providing critical overpressure protection for hot water boilers and storage tanks
Durable Construction: Fabricated from high-grade materials to resist corrosion and thermal degradation in aggressive exhaust environments
making it a versatile component for technicians managing R-22 or R-422D systems
Siemens Industrial Controls 3RH2911-1HA22 Contact Block R-407C ensuring the combustion blower isUpgrade your control panel's logic with the Siemens 3RH2911 1HA22, a high performance 4 pole auxiliary contact block designed for heavy duty industrial automation. This front mount unit features a 2NO + 2NC contact configuration (2 Normally Open and 2 Normally Closed), making it essential for expansion in complex HVACR and motor control circuits. Engineered as part of the SIRIUS modular system, it provides seamless integration with 3RT2 contactors and