Description
The Belimo GMB24-SR is a high-torque non fail-safe damper actuator designed to deliver 360 in-lb (40 Nm) for precise modulating airflow control. It operates on AC/DC 24 V power and supports a 2–10 V control signal with integrated position feedback for accurate damper positioning.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Belimo |
| Category |
Actuators & Dampers |
| Part Number |
GMB24-SR |
| Subcategory |
Damper Actuators |
| Nominal Voltage |
AC/DC 24 V |
| Nominal Frequency |
50/60 Hz |
| Voltage Range |
AC 19.2…28.8 V / DC 21.6…28.8 V |
| Power Consumption (Operation) |
4.5 W |
| Power Consumption (Rest) |
2 W |
| Transformer Sizing |
6.5 VA |
| Control Signal |
2…10 V (4…20 mA with resistor) |
| Input Impedance |
100 kΩ (2…10 V), 500 Ω (4…20 mA) |
| Position Feedback |
2…10 V |
| Torque Output |
360 in-lb (40 Nm) |
| Angle of Rotation |
Max. 95°, adjustable |
| Running Time (Motor) |
150 s / 90° |
| Electrical Connection |
18 AWG plenum cable, 1/2" NPT |
| Degree of Protection |
IP54 / NEMA 2 |
| Noise Level |
45 dB(A) |
| Ambient Temperature |
-30…50°C |
| Weight |
3.9 lb (1.8 kg) |
Information About GMB24-SR
The GMB24-SR is part of Belimo’s GMB series of non fail-safe damper actuators engineered for reliable modulating control in commercial HVAC systems. It features electronic overload protection throughout the full 0–95° rotation range to protect internal components and ensure consistent torque output. The actuator supports 2…10 V control and can be adapted for 4…20 mA operation using an external resistor, allowing compatibility with a wide range of building automation systems. A compact housing, selectable motor direction, and external manual override push button simplify installation, commissioning, and service.
Key Features
- Non Fail-Safe Operation: Provides powered damper positioning without spring return, suitable for applications where fail-safe action is not required.
- High Torque Output: Delivers a constant 360 in-lb (40 Nm) torque to reliably drive medium and large air dampers under varying load conditions.
- Modulating Control Capability: Accepts a 2…10 V control signal with optional 4…20 mA configuration for precise proportional airflow regulation.
- Electronic Overload Protection: Actively protects the actuator across the entire rotation range to prevent damage from obstruction or excessive load.
- Integrated Position Feedback: Supplies a 2…10 V feedback signal for continuous damper position monitoring and closed-loop control.
- Selectable Direction Of Motion: Motor rotation direction can be configured via an onboard switch to accommodate different mounting orientations.
- Manual Override Function: External push button allows manual positioning during setup, testing, or maintenance without tools.
The GMB24-SR delivers the reliability and precision required for accurate modulating airflow control in non fail-safe HVAC damper applications.
