Description
The Belimo FSTF120-RUS is a fire and smoke damper actuator designed to provide reliable on/off control with spring-return fail-safe operation in HVAC safety systems. Manufactured by Belimo, it delivers 18 in-lb (2 Nm) of torque to operate combination fire and smoke dampers during normal and emergency conditions. The actuator is intended for ventilation and air-conditioning applications requiring dependable damper positioning and automatic return upon power loss.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Belimo |
| Category |
HVAC Controls |
| Part Number |
FSTF120-RUS |
| Subcategory |
Fire & Smoke Damper Actuator |
| Type |
Spring Return Actuator |
| Control Type |
On/Off |
| Operating Voltage |
120 VAC |
| Frequency |
60 Hz |
| Torque |
18 in-lb (2 Nm) |
| Power Consumption |
2.0 W |
| Power Rating |
3.5 VA |
| Fail-Safe Function |
Spring Return |
| Angle of Rotation |
95° |
| Running Time |
75 seconds (motor), <25 seconds (spring return) |
| Operating Temperature |
32°F to 122°F (0°C to 50°C) |
| Protection Rating |
NEMA 2 / IP42 |
| Approvals |
UL555, UL555S (when installed with approved damper assemblies) |
| Weight |
1.2 lb (0.57 kg) |
Information About FSTF120-RUS
The FSTF120-RUS is part of Belimo's FSTF series of fire and smoke spring-return actuators developed for UL-listed fire and smoke damper assemblies. It is engineered for direct mounting on compatible damper shafts and provides reliable fail-safe positioning through an internal spring-return mechanism. The actuator operates on a 120 VAC power supply using simple on/off control while delivering 18 in-lb (2 Nm) of operating torque. It is designed for ventilation and air-conditioning systems and complies with UL555 and UL555S requirements when installed with approved dampers.
Key Features:
- Spring Return Operation: Automatically returns the damper to its fail-safe position after power loss
- On/Off Control: Provides simple two-position damper operation for fire and smoke protection
- 120 VAC Supply: Compatible with standard building HVAC control systems
- 18 in-lb Torque: Delivers 2 Nm of torque for reliable damper actuation
- Fire & Smoke Application: Designed for smoke and combination fire/smoke dampers
- Direct Shaft Mounting: Cold-weld clamp provides secure installation without shaft damage
- UL Compliance: Suitable for UL555 and UL555S listed damper assemblies
- Maintenance-Free Design: Built for dependable long-term operation with minimal servicing
The FSTF120-RUS delivers the reliability and precision required for fire and smoke damper control in commercial HVAC safety systems.
