Pay safe and fast with:
The Belimo SFA-S2 is a rotary damper actuator with spring return designed to control air damper sections up to approximately 4 m² in technical building installations. The actuator operates on an open/close signal: when powered, it moves to the operating position, tensioning the return springs. In case of power failure, the damper automatically and independently returns to the safe position, driven by the stored spring energy. This makes the actuator suitable for applications requiring a predefined safety position, such as fire and smoke dampers or emergency ventilation dampers in central air handling systems. The motor achieves a 90° rotation angle within 75 seconds, with a standby consumption of 3.5 W and a motor noise level of 45 dB(A). With a torque of 20 Nm and two integrated auxiliary switches for position feedback, it is suitable for large, heavy damper constructions in commercial and industrial HVAC systems.
The actuator mounts directly onto the damper shaft using the supplied universal clamp ring, suitable for shaft diameters from 10 to 25.4 mm. An included anti-rotation bracket prevents the actuator from rotating with the damper shaft. The direction of rotation for both the motor and spring return is set by the mounting orientation (L/R). The rotation angle is mechanically adjustable via stops up to a maximum of 95°. For manual operation, a hand crank allows locking the damper in any position. Electrical connection is made via a 1-metre power cable with two cores of 0.75 mm² and a separate 1-metre cable with six cores for the auxiliary switches. The actuator is maintenance-free and is ideally suited for open/close control of large air damper sections in central air handling units, mixing dampers, and emergency ventilation dampers in commercial buildings and industrial HVAC systems.
| Brand | Belimo |
| Category | Belimo damper actuators |
| GTIN | 7630498114144 |
| Manufacturer's item number | SFA-S2 |
| Article number | 23010056 |
| Category code | 101 |
| Suitable for air accessory | Yes |
| Supply voltage | 24 - 125 V DC / 24 - 240 V AC |
| Control signal | 2-point |
| Energy consumption in operation | 7 W |
| Energy consumption at rest | 3.5 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 | Yes |
| Position reporting system | None |
| Auxiliary contacts optional | Yes |
| End contacts | 2 |
| 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 | Yes |
| 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 | 18 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: 23010059
Item number: 23010061
Item number: 23010065
