Description
The Belimo FSNF120 US is a fire and smoke damper actuator designed to provide rapid and reliable on/off control during life-safety events. It delivers 70 in-lb of torque with spring return operation and is engineered for dependable performance in fire-rated HVAC damper applications.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Belimo |
| Category |
Actuators & Dampers |
| Part Number |
FSNF120 US |
| Subcategory |
Fire & Smoke Actuators |
| Actuator Type |
Spring return, fire and smoke |
| Nominal Voltage |
AC 120 V |
| Nominal Frequency |
50/60 Hz |
| Voltage Range |
AC 96…132 V |
| Nominal Torque |
70 in-lb (8 Nm) |
| Torque Rating (Fire) |
70 in-lb @ 350°F (177°C) for 30 min |
| Control Input |
On/Off |
| Power Consumption (Operation) |
27 VA |
| Power Consumption (Rest) |
6 W |
| Inrush Current |
3.2 A |
| Running Time (Motor) |
15 s / 90° |
| Running Time (Fail-Safe) |
<15 s |
| Angle of Rotation |
95° |
| Electrical Connection |
3 leads, 32 in (0.9 m) cable, 18 AWG, 1/2" NPT |
| Overload Protection |
Electronic throughout 0…95° rotation |
| Degree of Protection |
NEMA 1 |
| Enclosure Type |
UL Enclosure Type 1 |
| Ambient Temperature |
32…122°F (0…50°C) |
| Weight |
3.8 lb (1.7 kg) |
Information About FSNF120 US
The FSNF120 US is part of Belimo’s certified fire and smoke actuator series developed specifically for life-safety HVAC applications. It is engineered to operate reliably under elevated temperatures and emergency conditions, ensuring proper damper positioning during fire or smoke events. The actuator uses a spring return mechanism to drive the damper to its safety position upon power loss, meeting stringent code and regulatory requirements. Designed for maintenance-free service, it integrates robust electrical protection and proven mechanical components for long-term reliability.
Key Features
- Life-Safety Rated Fire And Smoke Actuation: Designed and tested to deliver 70 in-lb of torque at temperatures up to 350°F, ensuring reliable damper operation during fire conditions.
- Spring Return Fail-Safe Operation: Automatically drives the damper to its designated safety position upon power loss, supporting critical smoke containment strategies.
- Fast Response Time: Achieves full 90° rotation in approximately 15 seconds for both normal and fail-safe operation, enabling rapid system response.
- Robust Electrical Design: Operates on 120 VAC power with grounded housing and electronic overload protection for safe and stable performance.
- Flexible Installation Orientation: Direction of motion and fail-safe action can be configured through CW/CCW mounting to suit damper requirements.
- Integrated Position Indication: Mechanical position indicator provides clear visual confirmation of damper status during inspection and commissioning.
- Code And Standard Compliance: UL listed, UL 2043 compliant, and approved for use in air plenums and fire-rated HVAC systems.
The FSNF120 US delivers the reliability and precision required for fire and smoke damper control in commercial and institutional HVAC life-safety systems.
