Description
The Belimo EFB24-SR-S N4 is a high-torque spring return damper actuator delivering 270 in-lb of force for precise modulating airflow control. Operating on AC/DC 24 V with 2…10 VDC control, it provides reliable fail-safe performance in demanding HVAC and industrial environments.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Belimo |
| Category |
Actuators & Dampers |
| Part Number |
EFB24-SR-S N4 |
| Subcategory |
Damper Actuators |
| Actuator Type |
Spring return, modulating |
| Nominal Torque |
270 in-lb (30 Nm) |
| Nominal Voltage |
AC/DC 24 V |
| Control Signal |
2…10 VDC (4…20 mA compatible) |
| Power Consumption (Running) |
8 W |
| Power Consumption (Holding) |
4.5 W |
| Auxiliary Switches |
2 × SPDT |
| Electrical Connection |
Internal terminal blocks in junction box |
| Degree of Protection |
IP66 |
| Enclosure Rating |
NEMA 4X / UL Type 4 |
| Operating Temperature |
-22…122°F (-30…50°C) |
| Weight |
10.0 lb |
Information About EFB24-SR-S N4
The EFB24-SR-S N4 is part of Belimo’s heavy-duty spring return damper actuator series designed for applications requiring high torque and environmental protection. It features a robust enclosure rated IP66 and NEMA 4X, allowing installation in wash-down areas, outdoor locations, and harsh mechanical spaces. The actuator operates on AC/DC 24 V and supports modulating control with 2…10 VDC signals, while also accommodating 4…20 mA control through compatible interfaces. With integrated auxiliary switches and maintenance-free construction, it delivers dependable long-term performance in critical airflow control systems.
Key Features
- High Torque Spring Return Actuation: Provides 270 in-lb (30 Nm) of torque to reliably drive large or high-resistance dampers under load.
- Fail-Safe Spring Return Function: Automatically moves the damper to a predefined safety position during power loss to support system protection.
- Precise Modulating Control Capability: Supports 2…10 VDC modulation with compatibility for 4…20 mA control, enabling accurate airflow regulation.
- Dual Auxiliary Switches: Two integrated SPDT switches allow configurable end-position indication and interlocking with other control equipment.
- Rugged Environmental Protection: IP66 and NEMA 4X enclosure ratings ensure resistance to dust, moisture, and harsh operating conditions.
- Industrial-Grade Electrical Connections: Internal junction box with terminal blocks and knockouts simplifies secure field wiring.
- Maintenance-Free Design: Engineered for continuous-duty operation without routine servicing requirements.
The EFB24-SR-S N4 delivers the reliability and precision required for high-torque, fail-safe damper control in commercial and industrial HVAC applications.
