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The Belimo SF24A is a rotary damper actuator with spring return designed for open/close control of air damper sections up to approx. 4 m² in technical building installations. The actuator operates on an open/close signal: when power is applied, it moves to the working position and tensions the internal return springs. In the event of a power failure, the damper automatically and independently returns to the safe position, powered by the spring energy. This makes the actuator suitable for applications that require a predetermined safety position, such as fire/smoke or emergency ventilation dampers in central air handling units. The motor achieves a 90° rotation angle within 75 seconds, while the spring return closes the damper in less than 20 seconds. The standby consumption is 2.5 W and the motor noise level is 45 dB(A). With a torque of 20 Nm, it is suitable for large, heavy damper assemblies in commercial and industrial HVAC systems.
The actuator mounts directly onto the damper shaft using the included universal clamp ring, suitable for shaft diameters from 10 to 25.4 mm. The shaft must be at least 85 mm long, extending a minimum of 15 mm. An included anti-rotation device prevents the actuator from rotating with the shaft. The rotation direction of both motor and spring return is set via mounting orientation (L/R). The rotation angle is mechanically adjustable from 33% in 2.5% steps up to a maximum of 95%. For manual operation, a hand crank is included, allowing locking in any position. Electrical connection is via a fixed 1-metre cable with two cores of 0.75 mm². The actuator is maintenance-free and suitable for open/close control of large air damper sections in central air handling units, mixing dampers, and emergency ventilation dampers in commercial and industrial HVAC installations.
| Brand | Belimo |
| Category | Belimo damper actuators |
| GTIN | 7630498114021 |
| Manufacturer's item number | SF24A |
| Article number | 23010061 |
| Category code | 101 |
| Suitable for air accessory | Yes |
| Supply voltage | 24 V AC/DC |
| Control signal | 2-point |
| Energy consumption in operation | 5 W |
| Energy consumption at rest | 2.5 W |
| Model | Rotating |
| Regulation type on/off | No |
| Regulation type modulating | Yes |
| Regulation type splitrange | No |
| Connection cable length | 1 m |
| Transmission | With cogwheels |
| With direct mount top flange according to ISO 5211 | No |
| Return at zero supply voltage | Yes |
| Deactivated when closed | Yes |
| Automatic stroke recognition | No |
| Adjustable position feedback signal | No |
| Auxiliary contacts | No |
| Position reporting system | Optional |
| Auxiliary contacts optional | Yes |
| End contacts | None |
| Adjustable operating range | No |
| With mechanical setting indicator | Yes |
| Suitable for manual operation | Yes |
| Operating time | 75 s |
| Torque | 20 Nm |
| Potential free switch contact | No |
| Self-adjusting travel length | No |
| Max. angle of rotation | 95 ° |
| With safety function | Yes |
| Degree of protection (NEMA) | 2 |
| Degree of protection (IP) | IP54 |
| Max. electric power input | 7.5 VA |
| Ambient temperature (min) | -30 °C |
| Ambient temperature (max) | 50 °C |
| Height | 85 mm |
| Width | 130 mm |
| Depth | 290 mm |
| Explosion-proof | No |
| Housing material | Plastic |
| Suitable for valve | No |
Item number: 23010056
Item number: 23010059
Item number: 23010065
