Schneider Electric MS51-7203 24V Modulating Spring Return Valve Actuator

The Schneider Electric (Barber Colman) MS51-7203 is a 24V modulating valve actuator designed for precise proportional control of globe valves in HVAC and building automation systems. This spring return actuator features a 2-10 VDC control signal input and delivers 220 pounds of nominal force for reliable valve positioning.

Key Features:

• 24V AC operation (20-30V DC compatible) with low power consumption: 7.4W running, 2.9W holding
• Dual control signal options: 2-10 VDC or 4-20mA DC for flexible integration
• Spring return operation automatically returns valve to stem-up position on power loss
• Automatic input span adjustment to match valve travel requirements
• Manual override allows manual positioning and preload adjustment
• Overload protection throughout the entire stroke range
• Direct mount design for VB-7XXX series valves with included linkage—no separate mounting hardware required
• Compact NEMA 2 enclosure: 10-5/8" W × 2-9/16" D × 7" H for installation in space-constrained areas

Specifications:

• Voltage: 24V AC (50/60 Hz) or 20-30V DC
• Current Draw: 0.28A
• Nominal Force: 220 lbs
• Operating Temperature: -22°F to 140°F
• Connection: 3-foot appliance cable
• Housing Material: Durable polymer construction
• Certifications: UL, cUL, CE, C-Tick approved for US, Canada, and international markets

Ideal for commercial HVAC systems requiring fail-safe spring return operation and precise modulating control. The MS51-7203 combines reliable performance with easy installation and flexible control signal compatibility.