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Technical data sheet EFB120-S <br />www.belimo.com EFB120-S • en-us • 2023-03-10 • Subject to change 2 / 4 <br />Footnotes <br />Application <br />Operation <br />Typical specification <br />Weight Weight 12 lb [5.3 kg] <br />Materials Housing material Die cast aluminium and plastic casing <br />         <br />†Rated Impulse Voltage 4kV, Type of Action 1.AA.B, Control Pollution Degree 3. <br />Product features <br />For On/Off, fail-safe control of dampers in HVAC systems. Actuator sizing should be done in <br />accordance with the damper manufacturer's specifications. Control is On/Off from an auxiliary <br />contact or a manual switch. The actuator is mounted directly to a damper shaft up to 1.05" in <br />diameter by means of its universal clamp. A crank arm and several mounting brackets are <br />available for applications where the actuator cannot be direct coupled to the damper shaft. <br />Maximum of two EF's can be piggybacked for torque loads of up to 540 in-lbs. Minimum 3/4" <br />diameter shaft and parallel wiring. <br />The EF..120-S series actuators provide true spring return operation for reliable failsafe <br />application and positive close off on air tight dampers. The spring return system provides <br />constant torque to the damper with, and without, power applied to the actuator. The EF..120-S <br />series provides 95° of rotation and is provided with a graduated position indicator showing 0° <br />to 95°. The actuator may be stalled anywhere in its normal rotation without the need of <br />mechanical end switches. The EF..120-S versions are provided with two built-in auxiliary <br />switches. These SPDT switches provide safety interfacing or signaling, for example, for fan start- <br />up. The switching function at the fail-safe position is fixed at 10°, the other switch function is <br />adjustable between 10° to +85°. The EF..120-S actuator is shipped at 5° (5° from full fail-safe) to <br />provide automatic compression against damper gaskets for tight shut-off. <br />Installation Note: Use flexible metal conduit. Push the UL listed conduit fitting device over the <br />actuator's cable to butt against the enclosure. Screw in conduit connector. Jacket the actuator's <br />input wiring with UL listed flexible conduit. Properly terminate the conduit in a suitable junction <br />box. <br />On/Off spring return damper actuators shall be direct coupled type which require no crank arm <br />and linkage and be capable of direct mounting to a jackshaft up to a 1.05” diameter. The <br />actuators must be designed so that they may be used for either clockwise or counter clockwise <br />fail-safe operation. Actuators shall be protected from overload at all angles of rotation. If <br />required, two SPDT auxiliary switch shall be provided having the capability of one being <br />adjustable. Actuators with auxiliary switches must be constructed to meet the requirements for <br />Double Insulation so an electrical ground is not required to meet agency listings. Actuators shall <br />be cULus listed and have a 5 year warranty, and be manufactured under ISO 9001 International <br />Quality Control Standards. Actuators shall be as manufactured by Belimo. <br />Accessories <br />Electrical accessories Description Type <br />Auxiliary switch, mercury-free P475 <br />Auxiliary switch, mercury-free P475-1 <br />Signal simulator, Power supply AC 120 V PS-100 <br />Cable conduit connector 1/2"TF-CC US