Are these sold individually or as a kit

maintaining CFM regardless of duct resistance

The normally closed configuration ensures the valve remains shut when de-energized

providing precise modulation and monitoring of cooling

Dual Control Logic: Compatible with both on/off and floating (3-point) 24V controllers

MDI Mercury Displacement 35NO-24A Contactor 318518-761 Are these sold individually orThe MDI Mercury Displacement 35NO 24A Contactor is a heavy duty single pole normally open 24V switching solution designed for high cycle industrial and HVACR environments. Built for reliability where standard electromechanical relays fail, this 35 amp mercury relay utilizes a liquid mercury contact interface to provide a fresh conduction surface for every cycle. This displacement technology significantly reduces contact pitting and oxidation, making