Multi Products 2781A Actuator

The Multi Products 2781A Actuator is a heavy-duty, torque-box motor engineered for precision damper control in commercial HVAC systems. Operating at 120V AC, this UL Recognized unit delivers a consistent 2 RPM output, essential for maintaining exact airflow modulation. The motor features a CW (Clockwise) rotation and is equipped with a Type C Round Shaft, ensuring a secure mechanical interface with standard damper linkages. Built with a zinc die-cast housing for dust protection and a high-strength metal geartrain, the 2781-A is a field-proven OEM replacement actuator for brands like Ruskin and Greenheck. Its impedance-protected coil and 45 in-lb stall torque provide the reliability needed for high-cycle ventilation applications. Whether you are replacing a failed damper motor or upgrading a HVAC control sequence, this 120-volt actuator provides the necessary low back-gear torque for spring-return operations, ensuring the system fails safe during power loss.

• High-Torque Performance: Provides 45 in-lb of stall torque to manage large dampers without binding.
• Durable Construction: Heavy-duty zinc die-cast housing protects internal components from dust and debris in mechanical rooms.
• Reliable Gearbox: Features an all-metal geartrain designed for long-term durability in constant-cycle environments.
• Standardized Fit: The Type C round shaft and UL6 rating ensure compatibility with existing industrial ventilation hardware.
• Thermal Protection: Includes an impedance-protected coil to prevent motor burnout during stall conditions.

What is the difference between the 2781-A and the 2781-AS?
The primary difference is the shaft design. The 2781-A uses a Type C Round Shaft, while the 2781-AS is typically equipped with a Square Shaft. Always verify the shaft profile of your existing linkage before ordering.

Can this motor be used for spring-return applications?
Yes, the 2781A is designed with a low back-gear torque profile specifically to support spring-return damper assemblies, allowing the spring to close the damper when power is removed.

Is the rotation reversible in the field?
No, this specific model is fixed for Clockwise (CW) rotation. If your application requires Counter-Clockwise (CCW) movement, you must select the corresponding CCW model number.

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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.