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

The McDonnell & Miller 150S-M Boiler Low Water Cut-Off/Pump Controller provides reliable boiler protection for commercial and industrial systems. This mechanical actuation device combines a low water cut-off with a pump controller to prevent overheating and dry firing, helping to extend equipment life and improve safety. The unit features a 1 inch BSPT port, robust construction for steam and water media, and a 150 PSI pressure rating, making it suitable for demanding boiler applications.

Designed for compatibility with standard electrical controls, this controller operates on 120/240 VAC and is UL, CSA, FM listed for added confidence. It includes a manual reset and offers practical installation and operation in busy plant environments.

• Port connection: 1 inch BSPT for easy integration.
• Mechanical actuation with manual reset for reliable safety control.
• Electrical ratings: 7.4 A @ 120 V / 3.7 A @ 240 V (full load); 44.4 A @ 120 V / 22.2 A @ 240 V (locked rotor); Alarm circuit: 1 A @ 120 V / 0.5 A @ 240 V.
• Input supply: 120/240 VAC; 345 VA input capacity.
• Media handled: Steam and water, built for boiler environments.
• Pressure rating: 150 PSI.
• Dimensions: 13-1/4 in. L x 12-7/16 in. H.
• Applications & standards: Commercial and industrial use; UL, CSA, FM listed.