Overview
The Belimo NFB24-SR-S is a spring return modulating damper actuator equipped with an auxiliary switch for fail-safe control and position signaling in HVAC systems.
Features
- Modulating control with spring return fail-safe functionality
- Built-in auxiliary switch for end-position indication or interlocking
- Brushless DC motor with overload protection
- Manual override crank for setup and maintenance ease
Specifications
- Torque: 90 in-lb [10 Nm]
- Nominal Voltage: AC/DC 24 V
- Control Signal: 2 to 10 VDC modulating
- Actuator Type: Spring Return
- Auxiliary Switch: 1 x SPDT
- Power Consumption: 3.5 W running, 2.5 W holding
Applications
- Modulating fail-safe control of air dampers in commercial HVAC ductwork
- Auxiliary signaling and fan interlocking in ventilation systems





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