NFB24-SR Belimo Actuator

NFB24-SR Belimo Actuator Tech Sheet

NFB24-SR Belimo Actuator Install Manual

The Belimo NFB24-SR Damper Actuator is a spring-return, fail-safe actuator designed for reliable airflow control in commercial HVAC systems. Delivering 90 in-lb (10 Nm) torque with 24V AC/DC operation and modulating 2–10V control, this actuator provides precise positioning and automatic fail-safe response during power loss.

Apex Controls supplies genuine Belimo actuators with fast U.S. shipping for contractors, OEMs, and facility professionals.

Overview

The NFB24-SR is part of Belimo’s trusted NF series, engineered for medium-sized dampers requiring fail-safe operation. It features a spring-return mechanism that ensures the damper returns to a safe position when power is lost—critical for ventilation and system protection.

This actuator supports modulating control (2–10V), making it ideal for integration with modern building automation systems.

Key Features

• 90 in-lb (10 Nm) torque for medium-sized dampers
• Spring return (fail-safe) operation
• 24V AC/DC power supply
• Modulating control (2–10V)
• Direct-coupled mounting (no linkage required)
• Reliable fail-safe positioning on power loss
• Compact, durable design for long service life

Belimo’s spring-return design ensures positive close-off and safe positioning, even in critical airflow applications.

Applications

The Belimo NFB24-SR is commonly used in:

• Air handling units (AHUs)
• Rooftop units (RTUs)
• VAV systems requiring fail-safe operation
• Zone control dampers
• Building automation systems (BAS)

It is ideal for applications where fail-safe positioning is required for safety or system performance.

Technical Specifications