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Belimo SFA-S2 20 Nm Spring-Return HVAC Damper Actuator
- Regular price
- $607.00
- Sale price
- $607.00
- Regular price
-
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Product Description P/N: SFA-S2
Description
The Belimo SFA-S2 is a spring-return actuator designed for HVAC damper applications requiring high torque and fail-safe positioning. It provides 20 Nm of motor and fail-safe torque, operates across a broad AC/DC voltage range, and completes a 90° motor movement in 75 seconds.
Technical Specifications
| Condition | New/Never Used Surplus |
| Brand | Belimo |
| Category | HVAC Controls |
| Part Number | SFA-S2 |
| Subcategory | Damper Actuator |
| Actuator Type | Spring-return |
| Nominal Voltage | AC 24–240 V / DC 24–125 V |
| Nominal Voltage Range | AC 19.2–264 V / DC 21.6–137.5 V |
| Frequency | 50/60 Hz |
| Power Consumption (Running) | 7 W |
| Power Consumption (Rest Position) | 3.5 W |
| Power Consumption for Wire Sizing | 18 VA |
| Motor Torque | 20 Nm |
| Fail-Safe Torque | 20 Nm |
| Control Type | Spring-return damper actuator |
| Auxiliary Switches | 2 × SPDT |
| Auxiliary Switch Capacity | 1 mA–3 A (0.5 A inductive), DC 5 V–AC 250 V |
| Motor Direction | Selectable by mounting L/R |
| Fail-Safe Direction | Selectable by mounting L/R |
| Manual Override | Hand crank and locking switch |
| Angle of Rotation | Maximum 95° |
| Motor Running Time | 75 s / 90° |
| Fail-Safe Running Time | <20 s at -20°C to 50°C; <60 s at -30°C |
| Sound Power Level | 45 dB(A) |
| Mechanical Interface | Universal shaft clamp, 10–25.4 mm |
| Service Life | Minimum 60,000 fail-safe positions |
| Supply/Control Connection | 1 m cable, 2 × 0.75 mm² |
| Auxiliary Switch Connection | 1 m cable, 6 × 0.75 mm² |
| Parallel Operation | Yes |
| Protection Class | IEC/EN II; UL II, reinforced insulation |
| Degree of Protection | IP54 |
| NEMA Rating | NEMA 2 |
| Enclosure Type | UL Enclosure Type 2 |
| Ambient Temperature | -30°C to 50°C [-22°F to 122°F] |
| Storage Temperature | -40°C to 80°C [-40°F to 176°F] |
| Ambient Humidity | Maximum 95% RH, non-condensing |
| Rated Impulse Voltage Supply/Control | 4 kV |
| Rated Impulse Voltage Auxiliary Switch | 2.5 kV |
| Pollution Degree | 3 |
| Servicing | Maintenance-free |
| Certification | IEC/EN 60730-1 and IEC/EN 60730-2-14 |
| UL Approval | cULus according to UL60730-1A, UL60730-2-14 and CAN/CSA E60730-1 |
| Hygiene Standard | VDI 6022 Part 1 |
| Weight | 5.07 lbs. |
Information About SFA-S2
The SFA-S2 is built with a universal shaft clamp that accommodates mechanical interfaces from 10 to 25.4 mm. Its spring-return mechanism supports fail-safe positioning with a return time of less than 20 seconds at temperatures from -20°C to 50°C. The actuator includes two SPDT auxiliary switches, manual override through a hand crank, and adjustable mechanical end stops for limiting rotation. Its reinforced Class II insulation, IP54 protection, and NEMA 2 enclosure support installation in demanding HVAC environments.
Key Features:
- Spring-Return Operation: Provides automatic fail-safe damper positioning when actuator power is interrupted.
- High Torque Output: Delivers 20 Nm of motor and fail-safe torque for demanding damper applications.
- Wide Voltage Range: Operates with AC 24–240 V or DC 24–125 V nominal power.
- Fail-Safe Speed: Completes the spring-return movement in less than 20 seconds at -20°C to 50°C.
- Auxiliary Switches: Includes two SPDT switches for position indication and control functions.
- Manual Override: Allows manual positioning through an integrated hand crank and locking switch.
- Universal Shaft Clamp: Accommodates damper shafts from 10 to 25.4 mm.
- Protection Rating: Provides IP54 and NEMA 2 protection with reinforced Class II insulation.
The SFA-S2 delivers the reliability and precision required for high-torque fail-safe damper control in commercial HVAC applications.
Description
The Belimo SFA-S2 is a spring-return actuator designed for HVAC damper applications requiring high torque and fail-safe positioning. It provides 20 Nm of motor and fail-safe torque, operates across a broad AC/DC voltage range, and completes a 90° motor movement in 75 seconds.
Technical Specifications
| Condition | New/Never Used Surplus |
| Brand | Belimo |
| Category | HVAC Controls |
| Part Number | SFA-S2 |
| Subcategory | Damper Actuator |
| Actuator Type | Spring-return |
| Nominal Voltage | AC 24–240 V / DC 24–125 V |
| Nominal Voltage Range | AC 19.2–264 V / DC 21.6–137.5 V |
| Frequency | 50/60 Hz |
| Power Consumption (Running) | 7 W |
| Power Consumption (Rest Position) | 3.5 W |
| Power Consumption for Wire Sizing | 18 VA |
| Motor Torque | 20 Nm |
| Fail-Safe Torque | 20 Nm |
| Control Type | Spring-return damper actuator |
| Auxiliary Switches | 2 × SPDT |
| Auxiliary Switch Capacity | 1 mA–3 A (0.5 A inductive), DC 5 V–AC 250 V |
| Motor Direction | Selectable by mounting L/R |
| Fail-Safe Direction | Selectable by mounting L/R |
| Manual Override | Hand crank and locking switch |
| Angle of Rotation | Maximum 95° |
| Motor Running Time | 75 s / 90° |
| Fail-Safe Running Time | <20 s at -20°C to 50°C; <60 s at -30°C |
| Sound Power Level | 45 dB(A) |
| Mechanical Interface | Universal shaft clamp, 10–25.4 mm |
| Service Life | Minimum 60,000 fail-safe positions |
| Supply/Control Connection | 1 m cable, 2 × 0.75 mm² |
| Auxiliary Switch Connection | 1 m cable, 6 × 0.75 mm² |
| Parallel Operation | Yes |
| Protection Class | IEC/EN II; UL II, reinforced insulation |
| Degree of Protection | IP54 |
| NEMA Rating | NEMA 2 |
| Enclosure Type | UL Enclosure Type 2 |
| Ambient Temperature | -30°C to 50°C [-22°F to 122°F] |
| Storage Temperature | -40°C to 80°C [-40°F to 176°F] |
| Ambient Humidity | Maximum 95% RH, non-condensing |
| Rated Impulse Voltage Supply/Control | 4 kV |
| Rated Impulse Voltage Auxiliary Switch | 2.5 kV |
| Pollution Degree | 3 |
| Servicing | Maintenance-free |
| Certification | IEC/EN 60730-1 and IEC/EN 60730-2-14 |
| UL Approval | cULus according to UL60730-1A, UL60730-2-14 and CAN/CSA E60730-1 |
| Hygiene Standard | VDI 6022 Part 1 |
| Weight | 5.07 lbs. |
Information About SFA-S2
The SFA-S2 is built with a universal shaft clamp that accommodates mechanical interfaces from 10 to 25.4 mm. Its spring-return mechanism supports fail-safe positioning with a return time of less than 20 seconds at temperatures from -20°C to 50°C. The actuator includes two SPDT auxiliary switches, manual override through a hand crank, and adjustable mechanical end stops for limiting rotation. Its reinforced Class II insulation, IP54 protection, and NEMA 2 enclosure support installation in demanding HVAC environments.
Key Features:
- Spring-Return Operation: Provides automatic fail-safe damper positioning when actuator power is interrupted.
- High Torque Output: Delivers 20 Nm of motor and fail-safe torque for demanding damper applications.
- Wide Voltage Range: Operates with AC 24–240 V or DC 24–125 V nominal power.
- Fail-Safe Speed: Completes the spring-return movement in less than 20 seconds at -20°C to 50°C.
- Auxiliary Switches: Includes two SPDT switches for position indication and control functions.
- Manual Override: Allows manual positioning through an integrated hand crank and locking switch.
- Universal Shaft Clamp: Accommodates damper shafts from 10 to 25.4 mm.
- Protection Rating: Provides IP54 and NEMA 2 protection with reinforced Class II insulation.
The SFA-S2 delivers the reliability and precision required for high-torque fail-safe damper control in commercial HVAC applications.