Honeywell MS4120F1006 Two-Position Direct Coupled Damper Actuator (120V, 175 lb-in, Spring Return)

Heavy-duty fire and smoke damper actuator with fail-safe spring return for HVAC systems

Product Overview

The Honeywell MS4120F1006 is a two-position, spring return damper actuator designed for fire and smoke control applications. With 175 lb-in torque, rugged construction, and a direct-coupled mounting design, this actuator delivers reliable performance in demanding HVAC environments.

Its spring return fail-safe ensures the damper returns to a safe position during power loss, while the brush DC motor provides dependable operation. Built with a metal housing, UL plenum rating, and CE compliance, this actuator is ideal for critical air handling and safety systems.

Key Features

• Two-Position Control (SPST) – reliable open/close actuation

• Spring Return Fail-Safe – returns to safe position on power loss

• High Torque – delivers 175 lb-in for fire and smoke dampers

• Brush DC Motor – with electronic stall protection

• Direct Coupled Mounting – fits a wide range of damper shaft sizes

• Self-Centering Shaft Adapter – easy installation, secure fit

• Plenum-Rated (UL873) – safe for HVAC fire/smoke applications

• Manual Override – with locking crank function

• Wide Temperature Range – operates from -40°F to 140°F

• Rugged Design – metal housing, built-in mechanical end limits

Specifications

Applications

• Fire and smoke damper control

• HVAC safety shutdown systems

• Ventilation and air handling systems

• Critical airflow management in commercial and industrial facilities