electromechanical switching component engineered for high-current management in HVAC heating circuits

This thermal disc switch is built for durability in high-cycle environments

Replacement intervals generally range from 3 to 6 months depending on local environmental factors and odor concentrations

Professional installation is recommended to calibrate the differential pressure sensing and maintain optimal efficiency in high-demand heating environments

contractors can ensure a tight shut-off and maintain a 5

McDonnell & Miller 63-M Low Water Cut Off 30067439-890 electromechanical switching component engineered forThe McDonnell & Miller 63 M (Part Number 143100) is a heavy duty, float operated mechanical low water cut off designed for superior reliability in both hot water and steam boiler applications. Built for contractors who require a dependable safety interface, this unit features a manual reset mechanism and a robust No. 2 dual switch assembly. These switches provide simultaneous low water cut off protection and a dedicated circuit for an electric water