Schneider Electric (Barber Colman) M333A01 Actuator

Upgrade your building automation system with the Schneider Electric (Barber Colman) M333A01 Actuator, a precision-engineered 24V proportional non-spring return unit designed for a seamless fit with VBB and VBS series ball valves. As the direct replacement for M133A01, this SmartX M3 series actuator eliminates compatibility guesswork and simplifies field retrofits. It features a 10’ plenum-rated cable and an integral time-out feature, which automatically cuts power to the motor after a specified duration to prevent overheating and mechanical fatigue during stalled conditions.

Built for veteran contractors, this proportional control actuator allows for granular field configuration via accessible DIP switches. You can select between 0-5 Vdc, 0-10 Vdc, 5-10 Vdc, or 4-20 mA control signals to match any DDC system or thermostat requirements. Its non-spring return logic ensures the valve fails in place during power loss, maintaining current flow rates in VAV reheat, fan coil units, and unit ventilators. With a robust gear train and tool-less "PopTop" installation, it provides the reliability needed for high-demand HVACR environments.

• Universal Compatibility: Field-shippable and designed to fit all VBB/VBS valve bodies without specialized linkages or tools.
• Precise Modulating Control: Supports 0-10 Vdc actuator and 4-20mA control signals for stable, equal-percentage flow characteristics.
• Advanced Thermal Protection: Integrated time-out function safeguards the internal motor and extends the service life in high-duty cycle applications.
• Streamlined Configuration: External access door for DIP switches allows for quick direct acting or reverse acting setup without removing the casing.

• Is this compatible with my existing M133A01? Yes, the M333A01 is the engineered direct replacement for the legacy Barber Colman M133A01 model.
• What mounting hardware is required? No mounting hardware is needed; the actuator utilizes a tool-less, "PopTop" press-and-lock connection for 1/2" and 3/4" valve bodes.
• Can this be used in air plenums? Yes, the included 10-foot plenum-rated cable and thermoplastic housing meet requirements for air plenum installation.
• What happens if power is lost? Because this is a non-spring return (NSR) actuator, the valve will maintain its last position until power is restored and a new control signal is received.

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.