Operating on a 240Vac motor with spring return functionality

Compatible with Maxitrol RV91 and 210E Series gas regulators

the A30 series typically includes a break-off shaft

covering most two-stage HSI systems

McDonnell & Miller 7-B Switch 30067439-890 Operating on a 240Vac motorThe McDonnell & Miller 7 B Switch (Part Number 110800) is a critical component for specialized boiler control systems requiring potentiometer proportional control. This auto reset low water cut off switch is engineered to work in tandem with Series 93 and 94 pump controllers, providing precise positioning for modulating valves and ensuring consistent water levels in commercial steam applications. Unlike standard snap action switches, the 7 B utilizes