Honeywell Commercial MS4120A1209 Damper Actuator

Damper Actuator for commercial HVAC systems from Honeywell (MS4120A1209) delivers precise, reliable control with rugged performance. This 2-position, SPST, direct-coupled actuator uses spring-return operation and a manual crank for quick manual positioning, making it ideal for zone dampers and air-handling applications. The unit supports a voltage range of 100–250 VAC at 50/60 Hz, delivering 60 VA driving power and 13 VA holding power, with a robust 175 in-lb torque and 95 degrees of travel. The aluminum body sits in a NEMA 2 enclosure for indoor protection, while the enclosed screw terminal strip provides secure wiring connections. Built for HVAC service, it operates reliably from -40 to 140°F ambient and features a 45-second timing for timed control scenarios.

• Type: SPST, Direct Coupled, 2-Position
• Operation: Spring Return with Manual Crank
• Voltage: 100–250 VAC; 50/60 Hz
• Torque/Travel: 175 in-lb; 95° rotation
• Enclosure/Material: NEMA 2; Aluminum body
• Power: 60 VA driving; 13 VA holding
• Size/Shaft: 3.94 in W × 2.95 in D × 9.72 in H; shaft diameter 3/8 in to 1.06 in
• Connections: Enclosed screw terminal strip
• Temperature: -40 to 140°F
• Approvals: UL 873, CUL C22.2, CE, C-Tick
• Timing: 45 seconds
• Includes: 2 auxiliary switches