The Belimo EFB24-MFT is a heavy-duty, spring return damper actuator engineered for demanding commercial and industrial HVAC applications. Delivering a robust 270 in-lb of torque, this multi-function actuator is built to handle large damper assemblies with ease while offering exceptional control flexibility across a wide range of building automation and HVAC control systems.
Multi-Function Control Versatility
The EFB24-MFT stands apart from single-mode actuators by supporting four distinct control signal types in a single unit. Whether your system calls for analog, pulse-width modulation, or simple switching logic, this actuator adapts to your application without requiring additional hardware.
- 4–20 mA analog control (500 Ohm input impedance)
- PWM (Pulse Width Modulation) control (1500 Ohm input impedance)
- Floating point (tri-state) control
- On/Off control
Spring Return Safety Operation
The spring return mechanism ensures the damper automatically returns to its fail-safe position upon loss of power or control signal — a critical safety feature for smoke control, economizer, and ventilation applications.
- Automatic fail-safe positioning on power loss
- Reliable spring return mechanism for life-safety compliance
- Ideal for smoke, fire, and ventilation damper control
Electrical Specifications
- Supply voltage: 24 Vac / 24 Vdc
- Torque output: 270 in-lb
- Control input: 4–20 mA (500 Ohm), PWM (1500 Ohm), floating point, On/Off
Key Features
- High torque 270 in-lb output for large commercial dampers
- Multi-function (MFT) design supports multiple control signal types
- Spring return fail-safe operation
- Dual voltage compatibility: 24 Vac and 24 Vdc
- Suitable for building automation systems (BAS) and direct digital control (DDC)
- Belimo quality construction for long service life
Applications
- Commercial HVAC air handling units (AHUs)
- Economizer and outdoor air damper control
- Smoke and fire damper actuation
- VAV and zone damper systems
- Building automation and DDC system integration
