McDonnell & Miller 7-BM Switch 30067439-890 Frequent tripping often indicates a

Frequent tripping often indicates a downstream short in the transformer

Common failure points include voltage surges

and other fuel gases typically found in commercial heating applications

and Johnstone Supply components

McDonnell & Miller 7-BM Switch 30067439-890 Frequent tripping often indicates aThe McDonnell & Miller 7 BM Switch (Part Number 110900) is a heavy duty, potentiometer proportional low water cut off switch specifically built for Series 93, 193, 94, and 194 pump controllers. Designed for boiler systems requiring modulated feedwater control, this manual reset switch utilizes a 0 135 ohm slide wire resistor to provide a continuous signal to a proportional domestic or industrial modulating water valve. The single pole double break