For mid-torque spring return performance, the Honeywell MS8105A1030 provides a reliable 44 lb-in (5 Nm) DCA solution for 2-position (On/Off) control of HVAC air dampers and ball valves. This 24V direct-coupled actuator is engineered for high-cycle longevity in restrictive plenum spaces, featuring a 45-second drive time and a dependable spring return fail-safe that ensures the system defaults to its required position during power loss. This model is a direct technical superior to the MA4D-8033-100 and MS8105A1008, incorporating a self-centering shaft adapter that handles round shafts from 3/8" to 5/8" and square shafts from 1/4" to 1/2". With a NEMA 2/IP54 rating and 95-degree rotational stroke, it integrates seamlessly into industrial ventilation, air handlers, and louver systems where low noise operation and precision mechanical end limits are mandatory for system balance. Key Benefits for the Contractor: Direct Replacement: Verified drop-in substitute for the Honeywell MA4D-8033-100, reducing field modification time. Fast Response: Features a 45-second nominal drive time for rapid response to SPST control signals. Versatile Mounting: The direct-coupled design eliminates complex linkages, allowing for faster installation on various shaft shapes. Fail-Safe Security: Robust spring return mechanism provides 44 lb-in torque to shut or open dampers immediately upon power failure. Field Flexibility: Includes a field-selectable spring return direction and an enclosed screw terminal strip for secure wiring. Common Questions & Technical Support: Can this actuator replace a modulating model? No, the MS8105A1030 is a two-position (on/off) actuator. If your controller outputs a 2-10VDC or 4-20mA signal, you will need a modulating series model like the MS7505. Does this allow for manual override? This 44 lb-in series relies on the spring return mechanism; manual override via a crank is typically reserved for higher torque models in the S10 or S20 series. What is the maximum stall torque? While the rated operating torque is 44 lb-in, the maximum stall torque is rated up to 105 lb-in to prevent gear damage under excessive load. 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.
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