Schneider Electric (Barber Colman) M400A-S2-VB Actuator

The Schneider Electric (Barber Colman) M400A-S2-VB is a robust Forta globe valve actuator engineered for high-precision HVAC control systems. Operating on a 24V supply, this non-spring return linear actuator provides 90 lbf of force, making it an ideal match for Schneider Electric VB-7xxx series valves. Its versatile design allows for field-selectable floating or proportional control, accepting 0 to 10Vdc, 2 to 10Vdc, or 4 to 20mA signals with the included 500 Ohm resistor. The integrated 2 to 10Vdc feedback signal ensures real-time positioning accuracy for complex building automation loops. Designed for fast field installation, the screw-mount configuration secures directly to the valve bonnet without needing separate linkage kits. This model also features two SPDT auxiliary switches for end-point signaling or sequencing, and a brushless DC motor for quiet, maintenance-free operation. With its "one-touch" stroke calibration, the M400A-S2-VB automatically scales its travel to fit valves with 3/8" to 2" strokes, optimizing proportional valve control performance in chilled water, hot water, and steam applications.

• Universal Compatibility: Field-selectable switches allow for easy transitions between proportional and floating control modes on a single unit.
• Direct Mount Efficiency: The screw-mount design fits VB-7000 valves directly, reducing installation time and eliminating the need for extra hardware.
• Precise Monitoring: Built-in 2-10Vdc feedback and two SPDT auxiliary switches provide superior system status oversight.
• Self-Calibrating Logic: Features "One Touch" calibration to automatically learn and scale to the specific valve stroke length.

How do I wire the M400A-S2-VB for 4-20mA signals?
To utilize a 4-20mA control signal, you must install the supplied 500 Ohm resistor across the input terminals to convert the current to a 2-10Vdc signal.

Does this actuator require a separate linkage kit?
No, the M400A-S2-VB screw-mount style is specifically designed to thread directly onto the bonnet nut of Schneider Electric VB-7xxx globe valves.

Can the action be reversed in the field?
Yes, the actuator includes internal DIP switches that allow a technician to set direct or reverse acting operation to match the needs of normally open or normally closed valve assemblies.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.