McDonnell & Miller 150S Boiler Low Water Cut-Off/Pump Controller

The McDonnell & Miller 150S Boiler Low Water Cut-Off/Pump Controller is a critical safety and control device for commercial and industrial boilers. This mechanical actuation unit combines a low-water cutoff with a pump controller to prevent boiler damage and ensure reliable operation in steam and hot-water systems.

Designed for durability and easy integration, this unit features a 1 inch BSPT port, 120/240 Volt AC input, and robust current ratings that cover full-load and alarm service. The 150S supports steam and water media, with a pressure rating up to 150 PSI, making it suitable for demanding boiler applications.

• Mechanical actuation for dependable response
• 1 inch BSPT port connections for versatile installation
• Input supply: 120/240 VAC; full-load current 7.4 A (120V) / 3.7 A (240V)
• Alarm circuit: 1 A (120V) / 0.5 A (240V); locked-rotor ratings 44.4 A (120V) / 22.2 A (240V)
• Media: Steam and water; Pressure rating: 150 PSI
• Application: Commercial and industrial boiler systems
• Standards: UL, CSA, FM-listed
• Dimensions: 13-1/4" L x 12-7/16" H

Trustworthy boiler safety and efficiency with the McDonnell & Miller 150S, a proven choice for protecting equipment and ensuring continuous operation.