Armstrong International B2721 Contactor R-410A It is designed for closed-loop

It is designed for closed-loop hydronic systems

Direct Compatibility: Designed for seamless field installation with Setra SRPM and MRMS monitoring systems

ensuring mounting holes and wiring align perfectly

Will this resolve a 'Rollout Switch' or 'Pressure Switch' lockout

Armstrong International B2721 Contactor R-410A It is designed for closed-loopThe Armstrong International B2721 is a high performance 50 Amp Contactor designed specifically for heavy duty industrial and commercial humidification systems. Engineered for precision and longevity, this replacement HVAC contactor serves as a critical component in managing power distribution for Armstrong steam humidifiers. It is fully compatible with EHU 600, EHU 601, EHU 602, EHU 701, EHU 703, and EHU 704 models, as well as the HC Series