Belimo EFB24-SR-N4 Spring Return Damper Actuator, NEMA 4, 270 in-lb, 24V

Description

Belimo EFB24-SR-N4 Spring Return Damper Actuator Overview

The Belimo EFB24-SR-N4 is a heavy-duty, direct-coupled spring return damper actuator engineered for demanding commercial and industrial HVAC applications. Delivering 270 in-lb of torque, this actuator is built to reliably drive large dampers in air handling units, VAV systems, and ventilation applications. Its NEMA 4 rated enclosure provides robust protection against dust, splashing water, and other environmental hazards, making it well-suited for both indoor and outdoor installations.

Key Features

• Spring return fail-safe operation — damper returns to a defined safe position on loss of power
• 270 in-lb torque output for driving large commercial dampers
• NEMA 4 enclosure rating for protection against dust, rain, and splashing water
• Proportional 2–10 Vdc control signal for precise modulating control
• Dual voltage compatibility: 24 Vac / 24 Vdc power supply
• Direct-coupled design — no crank arm or linkage required
• Belimo’s proven actuator technology for long service life and reliable performance

Electrical Specifications

• Power Supply: 24 Vac / 24 Vdc
• Control Signal: 2–10 Vdc (proportional/modulating)
• Enclosure Rating: NEMA 4

Mechanical Specifications

• Torque: 270 in-lb
• Actuator Type: Spring Return (fail-safe)
• Mounting: Direct-coupled

Typical Applications

• Commercial air handling units (AHUs)
• Variable air volume (VAV) systems
• Outdoor air and exhaust dampers
• Industrial ventilation and process control
• Wet or washdown environments requiring NEMA 4 protection

Why Choose the Belimo EFB24-SR-N4?

Belimo is the global leader in actuator and valve technology for HVAC systems. The EFB24-SR-N4 combines high torque output with a weatherproof NEMA 4 enclosure and fail-safe spring return action, ensuring your system responds correctly even during power interruptions. The 2–10 Vdc proportional control interface integrates seamlessly with building automation systems (BAS) and DDC controllers for precise airflow management.