Description
The Belimo FSNF120-S US is a fire and smoke damper actuator designed to deliver 70 in-lb of torque with rapid spring return operation for life safety HVAC applications. It operates on AC 120 V power with on/off control and includes dual auxiliary switches for reliable position indication and system interlocking.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Belimo |
| Category |
Dampers & Actuators |
| Part Number |
FSNF120-S US |
| Subcategory |
Fire & Smoke Actuators |
| Nominal Voltage |
AC 120 V |
| Nominal Frequency |
50/60 Hz |
| Voltage Range |
AC 96…132 V |
| Power Consumption (Operation) |
27 VA |
| Power Consumption (Rest) |
6 W / 9 VA |
| Inrush Current |
3.2 A |
| Control Type |
On/Off |
| Auxiliary Switches |
2x SPDT |
| Switching Capacity |
7 A resistive, 2.5 A inductive @ 250 VAC |
| Torque Output |
70 in-lb (8 Nm) |
| Angle of Rotation |
95° |
| Running Time (Motor) |
15 s / 90° |
| Running Time (Fail-Safe) |
<15 s |
| Electrical Connection |
18 AWG leads, 0.9 m, 1/2" NPT |
| Degree of Protection |
NEMA 1 |
| Noise Level |
45 dB(A) motor |
| Weight |
6.2 lb (2.8 kg) |
Information About FSNF120-S US
The FSNF120-S US is part of Belimo’s fire and smoke actuator lineup engineered to meet stringent life safety and code compliance requirements. It features a grounded metal housing and electronic overload protection to ensure reliable operation during normal conditions and emergency events. The actuator is rated to deliver its full 8 Nm torque at elevated temperatures up to 350°F for 30 minutes, supporting critical fire and smoke control functions. Reversible mounting for both motor and fail-safe direction, along with integrated auxiliary switches, enables flexible installation and dependable system integration.
Key Features
- Fire And Smoke Safety Design: Engineered specifically for fire and smoke dampers to support life safety operation and code compliance in HVAC systems.
- Spring Return Fail-Safe Operation: Integrated spring mechanism drives the damper to its safety position immediately upon power loss or emergency shutdown.
- High Temperature Torque Rating: Delivers 70 in-lb of torque at temperatures up to 350°F for 30 minutes, ensuring reliable operation during fire conditions.
- Dual Auxiliary Switches: Includes two SPDT switches for precise position indication, system interlocking, and safety monitoring.
- Fast Actuation Speed: Motor and fail-safe return operate in under 15 seconds to ensure rapid damper response.
- Electronic Overload Protection: Protects the actuator across the full 0…95° rotation range from mechanical overload or obstruction.
- Robust Grounded Housing: NEMA 1 metal enclosure provides durability and electrical safety for 120 V installations.
The FSNF120-S US delivers the reliability and precision required for dependable fire and smoke damper control in life safety HVAC systems.
