Belimo Spring-Return Damper Actuator Kit
Belimo EFX120-SR N4 30 Nm Spring-Return Damper Actuator Kit
Description
Available is one Belimo EFX120-SR N4 modulating spring-return damper actuator kit, identified by the physical Belimo product label as part number 386557. The actuator is rated 270 in-lb / 30 Nm and has an AC 100–240 V power supply with DC 2–10 V control input and DC 2–10 V position feedback.
The supplied photographs show the actuator in its original-style Belimo carton, within an outer carton. The outer carton also contains loose metal mounting pieces and printed Belimo installation material. The item is offered as a kit as shown. No representation is made that every component of an original factory kit is present; buyer must verify all included pieces before purchase.
Belimo identifies the EFX120-SR N4 as a configurable, modulating damper actuator with spring return and NEMA 4 protection. The physical actuator label additionally shows the product-label date 2026-02-11, 95-second motor timing, and spring-return timing under 20 seconds. This date is not represented as a manufacture date.
Verified Identification and Published Reference Data
| Specification | Details |
| Manufacturer / brand | Belimo |
| Belimo part number | 386557 |
| Model | EFX120-SR N4 |
| Actuator function | Modulating, spring-return damper actuator |
| Motor torque | 270 in-lb / 30 Nm |
| Nominal supply | AC 100–240 V, 50/60 Hz |
| Input control signal | DC 2–10 V |
| Position-feedback signal | DC 2–10 V |
| Running power consumption | 9.5 W |
| Holding power consumption | 4.5 W |
| Power sizing reference | 21 VA |
| Maximum rotation | 95° |
| Motor running time | 95 seconds per 90° |
| Spring-return time | Under 20 seconds at -20 to 50 °C, per current OEM data |
| Manual override | 5 mm hex crank / 3/16 in. Allen, supplied by OEM for the model |
| Enclosure | NEMA 4 / UL Enclosure Type 4 |
| Ambient operating temperature | -30 to 50 °C / -22 to 122 °F |
| Manufacturer actuator-weight reference | 4.7 kg / 10 lb |
Published specifications are for the EFX120-SR N4 model family and are provided only as a reference. The buyer must verify the exact product configuration, wiring, programmed operating time, control sequence, fail-safe direction, shaft interface, mounting configuration, enclosure suitability, compatible damper, and current manufacturer documentation before installation.