Honeywell MS4109F1010 Fire/Smoke Damper Actuator 120V

The MS4109F1010 is a two-position spring return actuator built for fire and smoke damper control in commercial HVAC systems. It operates on 120V AC, 60 Hz, single phase power and is hardwired via 18 AWG conductors through a 7/8-inch conduit connection. The die-cast aluminum housing carries a NEMA 1 enclosure rating and a 350°F temperature rating, with an operating range of 0°F to 130°F. Internally it uses a 2-pole SPST switch with CW/CCW rotation and a 5A resistive / 3A inductive contact rating at 250VAC. It is UL-555 and UL-555S listed, along with cULus, UL873, CE, and C-TICK certifications, and direct mounts to the damper shaft. This actuator is an OEM replacement unit compatible with both Honeywell and Belimo fire/smoke damper systems, cross-referencing to OEM part number FSNF120. It is intended for professional installation on line-voltage fire and smoke management systems where spring return closure is required during emergency conditions. Honeywell backs this actuator with a 5-year warranty.