Xylem 150S-M Low Water Cut-Off Pump Controller Manual Reset Boiler Control Boards & Modules

The McDonnell & Miller 150S-M is a combination float-operated low water cut-off and pump controller with manual reset for steam boilers. This critical safety and control device protects boilers from dangerous low-water conditions while automatically managing feed pump operation.

Key Features:

• Snap acting manual reset SPDT switch for positive safety control
• Operates on 120/240 VAC with 150 psi maximum pressure rating
• Single pole, single throw switch for pump control and single pole, double throw switch for low water cut-off and alarm actuation
• 345 VA rating with 13-1/4 inch width
• Maximum differential operation prevents nuisance burner shut-down in low pressure applications
• NEMA 1 general purpose enclosure for reliable protection

McDonnell & Miller, a Xylem brand, is a leader in engineering and manufacturing boiler controls, liquid level controls, low-water cutoffs, and flow switches for steam and hot water boilers in industrial, commercial, and building applications. The 150S-M provides dependable protection with field-proven float technology and bi-metal snap switches rated for 120 volt operation.