Belimo FSNF120 Actuator

The Belimo FSNF120 is a high-torque fire and smoke damper actuator designed for life safety applications in HVAC systems. Operating on a 120 VAC power supply, this spring return actuator delivers 70 in-lb of torque, ensuring reliable fail-safe operation during power loss or fire alarms. Built with a rugged steel housing, it is engineered to meet UL555 and UL555S standards, capable of strictly managing smoke leakage in commercial ductwork. The unit features a mechanical spring return mechanism that provides a consistent closed position without requiring complex external power backups. Integrating the FSNF120 into existing BAS protocols is straightforward due to its 1m halogen-free cable and standardized mounting. This model is commonly utilized for both multizone smoke control and general fire protection, providing the necessary thermal protection and cycling endurance required for demanding mechanical codes. This actuator ensures precise damper positioning for optimal airflow management and code-compliant fire safety integration.

• High Torque Output: Delivers 70 in-lb (8 Nm) of torque for effective damper operation under high-pressure conditions.
• Rapid Response Time: Engineered for fast spring return action, meeting rigorous life safety response requirements.
• Code Compliance: Meets UL555 and UL555S ratings for fire and smoke damper applications in commercial buildings.
• Durable Construction: Features a robust metal housing designed to withstand elevated temperatures during emergency scenarios.
• Simplified Installation: Comes equipped with a 1m cable and universal shaft clamp, reducing field labor for contractors.

How do I wire the Belimo FSNF120 for 120V service?
The unit features a standard 120 VAC connection; always refer to the specific wiring diagram for your fire alarm control panel to ensure proper signal integration.

What is the maximum damper area this actuator can drive?
The 70 in-lb rating typically supports dampers up to 12 square feet, though this varies based on damper manufacturer seals and air velocity.

Can this actuator be used in variable air volume (VAV) systems?
Yes, provided the application requires a two-position (On/Off) fire and smoke safety function for the dampers.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.