Xylem 157S-RL Low Water Cut-Off and Pump Controller with Snap Switch

The Xylem-McDonnell & Miller 157S-RL is a combination float-operated low water cut-off and pump controller designed for commercial and industrial steam boiler applications. This reliable control system protects your boiler by automatically shutting down the burner when water levels drop below safe operating levels, while simultaneously controlling pump operation to maintain proper water levels.

Key Features:

• Dual snap-action bi-metal switches rated for high-temperature service at 120 volts
• Single pole, single throw switch for automatic pump control
• Single pole, double throw switch for low water cut-off and alarm actuation
• Automatic reset operation for continuous protection
• Monel bellows construction provides superior corrosion resistance
• Integral water column with 1/2" NPT tappings for gauge glass and tri-cocks
• Maximum operating pressure of 150 PSI (10.5 kg/cm²)
• Alternative tapped 1-1/4" FIP connection for flexible installation
• NEMA 1 general purpose enclosure rating

Technical Specifications:

• Voltage: 120/240 VAC
• Pump circuit rating: 7.4A at 120V / 3.7A at 240V (full load)
• Motor horsepower: 1/3 HP at 120V or 240V
• Alarm circuit: 1A at 120V / 0.5A at 240V
• Connection type: Screwed with alternate tappings

The 157S-RL is suitable for boilers of any steaming capacity and provides reliable protection in both low and high-pressure applications. Part number 176902.