Belimo FSNF120-S Actuator

The Belimo FSNF120-S is a specialized fire and smoke damper actuator designed for life safety applications in HVAC systems. Operating on 120 VAC, this spring-return actuator delivers 70 in-lb of torque, ensuring reliable fail-safe operation during power loss or smoke detection events. Built with a rugged high-strength steel housing, it meets UL555 and UL555S requirements for smoke control. This model features two integrated SPDT auxiliary switches for precise position feedback to the building automation system or fire alarm panel. The FSNF series provides a rapid 15-second opening time and a fast-acting 15-second spring-return closure, maintaining the integrity of fire barriers. With its 1m appliance cable and compact footprint, this unit is engineered for straightforward field installation or direct replacement of aging pneumatic or electric actuators in commercial ductwork.

• 70 in-lb Torque: Ensures positive seal on fire and smoke dampers under high-velocity conditions.
• Dual Auxiliary Switches: 2 SPDT internal switches provide remote indication of damper blade position.
• Life Safety Compliance: Specifically designed to meet demanding UL555 and UL555S smoke control standards.
• Fast Spring Return: Rapid closure in under 15 seconds provides critical protection during thermal emergencies.
• Field Reliability: Brushless DC motor technology reduces maintenance and ensures long-term performance in standby mode.

What is the difference between the FSNF and FSLF series?
The FSNF120-S provides higher torque (70 in-lb) compared to the smaller FSLF series (30 in-lb), making it suitable for larger damper areas up to 12 square feet at 350°F.

Can the FSNF120-S be mounted in any orientation?
Yes, it is designed for multi-position mounting, provided the technical specifications for the drive shaft and damper linkage are maintained.

How do the auxiliary switches function in this model?
The 2 SPDT switches are fixed at 10° and 85° to provide reliable open and closed status signals for fire safety monitoring protocols.

This item is not eligible for free shipping.

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.