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OEM Precision: Direct S1-3500-378P replacement ensures terminal alignment and mechanical compatibility without secondary modifications
ensuring the unit passes its sequence of operation without erratic inducer motor behavior
Built with a rugged bronze body and high-grade stainless steel trim
Enhanced Precision: Minimizes hysteresis and ensures the valve stem maintains the exact position dictated by the controller signal
Utilizing a heat pump reversing valve that meets exact manufacturer specifications is essential for maintaining the structural integrity of the sealed system and preventing compressor strain
Siemens Industrial Controls 3RT2026-1BB40 Contactor 326070-701 OEM Precision: Direct S1-3500-378P replacementThe Siemens Sirius 3RT2026 1BB40 Contactor is a heavy duty S0 size power contactor engineered for demanding motor control and industrial HVACR automation. Operating on a 24VDC control coil, this 3 pole device maintains a 25A AC 3 rating at 400V, providing a power delivery capacity of up to 11kW. Built for high cycle reliability in panel mount or 35mm DIN rail configurations, the 3RT2026 1BB40 features two integrated auxiliary contacts (1 NO + 1 NC)