Somfy built the Roll Up Wired R28 for the smallest tubes in an interior job. The motor body measures 1.1 in across, and Somfy publishes a 1.05 in minimum internal tube diameter for it. That one figure decides more orders than torque does.
Tube diameter and the shades this motor drives
A fabricator who has already cut 1.25 in or 2 in aluminum tube has a crown and drive question, not a motor question. The R28 body slides into the tube, and the crown carries the motor head while the drive turns the tube. Somfy sizes those two parts to the tube profile, not to the motor. Order the wrong pair and the motor spins inside a tube it never grips.
Length matters on narrow shades. Somfy publishes 11.77 in for the R28 body, so a 16 in wide blind leaves room for the end plug and the bracket. Torque comes second in this conversation. Somfy rates the R28 at 0.8 Nm, which converts to 7.08 in-lb, turning the tube at 30 rpm.
Somfy lists interior window coverings for this reference: roller blinds, solar screens, zebra blinds and Roman shades. The rating suits light fabric on a short tube. Cellular and Silhouette retrofits fall in the same class, which explains the Hunter Douglas crown kit Somfy publishes for the R28 platform.
Exterior work sits outside this motor. Somfy rates the R28 at IP 30 and names interior blinds and shades as the application, so a solar screen on an open patio belongs on a Sunea or an Altus RTS instead. Our motor sizing guide walks the torque math for heavier assemblies.
Verified Somfy specifications
| Specification | Somfy published value |
|---|---|
| Reference | 1002833 |
| Somfy name | Roll Up Wired R28 (Ear Mount) |
| Torque | 0.8 Nm (7.08 in-lb) |
| Speed | 30 rpm |
| Supply | 24V DC nominal, 20 V minimum to 27 V maximum |
| Rated current | 0.32 A |
| Power in operation | 7.7 W |
| Standby power | 0.407 W |
| Sound level | 57 dB |
| Protection rating | IP 30 |
| Insulation class | Class III |
| Head type | Round |
| Motor diameter | 1.1 in |
| Motor length | 11.77 in |
| Minimum tube inside diameter | 1.05 in |
| Cable length | 0.98 ft |
| Limit setting | Electronic |
| Thermal protection | 6 min |
| Operating temperature | 14 F to 167 F |
| Storage temperature | -4 F to 176 F |
| Weight | 0.57 lb |
| Warranty | 5 years |
Figures come from Somfy's own e-catalog record for reference 1002833. Two notes belong beside them. Somfy's consumer page prints an 11 V to 24 V DC range for the same reference while the e-catalog prints a 20 V to 27 V window, so specify the 24V DC supply Somfy sells for the platform and treat 24V as the design point. Somfy also publishes the head type as round. Distributors label the three R28 mounting styles ear, pin and star hole, and Somfy's own page for 1002833 reads "Ear Mount".
Crown and drive parts that fit
Four kits carry the R28 into the tube profiles a workroom sees most.
- Somfy RollEase 1.25" Crown & Drive (9025815) handles the small RollEase tube that suits the 0.8 Nm rating.
- Somfy Crown & Drive Kit for RollEase 2" Shade Tubes (9021017) steps the same 28 mm body up to a 2 in tube when the fabric width calls for it.
- Somfy R28 Sonesse Crown & Drive Kit (Post 04) for Silhouette and Hunter Douglas (9025816) covers the retrofit work on Hunter Douglas hardware.
- Somfy 400 Series Adapter Kit (9020676) adapts the 28 mm head into 400 Series brackets.
Measure the tube inside diameter before you pick. A 2 in RollEase tube and a 1.25 in RollEase tube take different drives even with the same motor in the middle.
Power and control wiring
The R28 runs on low voltage and carries no radio receiver. A Somfy 24V DC supply feeds it, and a wired low-voltage control drives the up and down inputs. Somfy rates the motor Class III at 0.32 A, drawing 7.7 W in operation and 0.407 W at rest. That standby figure lets an integrator budget a shared supply across a run of shades.
RTS remotes and Zigbee hubs do not pair with this reference. Somfy reserves radio control for its receiver-equipped motors, and specifying an RTS handheld beside a Roll Up Wired R28 leaves a buyer with a transmitter that has nothing to talk to. Shade Motors Direct keeps the wired and radio families separate for that reason.
The motor ships with a 0.98 ft lead. Confirm the connector on the motor you receive against the supply and controller you plan to wire, since Somfy builds the R28 platform in several mounting styles.
Limits, noise and install notes
Somfy sets the R28 up with electronic limits. An installer drives the shade to the upper stop and the lower stop, records them, and the motor repeats them. Thermal protection cuts in after 6 minutes of continuous running, which a residential blind never reaches on a normal cycle.
Somfy publishes 57 dB for this motor. A bedroom install puts that figure in front of the client before the order goes in. Quieter interior work belongs to the Sonesse line, and Somfy engineers the Sonesse ULTRA motors around acoustic performance for those rooms.
Operating range runs 14 F to 167 F, with storage from -4 F to 176 F. IP 30 keeps the R28 in conditioned interior space. Somfy backs the motor with a 5 year warranty.
Ordering the R28 and its hardware
The Somfy Roll Up Wired R28 24V DC motor (1002833) ships as the motor alone. Add the crown and drive that matches your tube, a bracket that accepts the round head, and the 24V DC supply the run needs. Buyers who want the pin mount or star hole version of the same platform should check the reference number on the box, since Somfy assigns 1002832 and 1002834 to those styles.
Frequently asked questions
What tube does the Somfy Roll Up Wired R28 fit?
Somfy publishes a minimum internal tube diameter of 1.05 in for reference 1002833. The motor body measures 1.1 in across and 11.77 in long. Larger tubes such as RollEase 1.25 in and RollEase 2 in take the same motor through a crown and drive kit sized to that tube profile.
Can RTS remotes control the Roll Up Wired R28?
No. Somfy builds this reference as a wired 24V DC motor with no radio receiver inside. Control comes from a low-voltage wired input. Buyers who want handheld radio control should specify a Somfy motor with a built-in RTS or Zigbee receiver instead.
How much torque does the R28 produce?
Somfy rates the Roll Up Wired R28 at 0.8 Nm, which converts to 7.08 in-lb, at 30 rpm. That rating suits light interior fabric on a short tube: roller blinds, solar screens, zebra blinds and Roman shades.
Why do distributors call 1002833 both ear mount and flush mount?
Somfy's own product page names reference 1002833 "Roll Up Wired R28 (Ear Mount)". Distributors describe the same head as flush mount. The reference number identifies the motor, so order by 1002833 and the mounting style follows.
Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
