Hubbell Industrial Controls 47AB10BH Relay 320788-703 preventing the burners from firing

preventing the burners from firing as a safety precaution against inadequate venting

While often used in 208/230V environments

The 193407501 extension module is built for durability in demanding mechanical environments

or the inducer motor sounding like it is "gurgling" due to water backup

Hubbell Industrial Controls 47AB10BH Relay 320788-703 preventing the burners from firingThe Hubbell Industrial Controls 47AB10BH Relay is a heavy duty 480V alternating relay engineered for industrial duplex pump and compressor control systems. As a veteran grade Type 5247 alternating relay, it provides a reliable mechanical means to automatically alternate the operation of two separate motor driven loads. This lead lag functionality ensures even mechanical wear and maximizes system uptime. Designed for 480V alternating relay