Small openings put a motor in a tight spot. The Somfy Sonesse 30 RTS 24V DC Motor (1241142) answers that with a 30 mm body that drops into a tube as narrow as 1.13 inches (28.7 mm) inside diameter, which is what lets a motorized shade disappear into a slim cassette or a shallow headrail.
The shade sizes a 2 Nm motor suits
Somfy rates this motor at 2 Nm, which converts to 17.7 in-lb. That figure covers narrow to mid width interior roller shades and small projection screens, along with sheer shades on a light tube. Designers reach for it when the opening is modest and the pocket detail leaves little room.
Torque is not the only limit. A shade's finished roll diameter grows with fabric thickness and drop, and a fat roll on a small tube raises the effective load at the motor. Shade shops sizing a blackout fabric on a long drop step up to a 40 mm or 50 mm motor instead, and Somfy builds both.
Somfy measures this motor at 47 dB and lists it against the Designed for Silence criteria. A bedroom shade cycling on a morning schedule stays under the noise floor of the room.
Somfy builds the same 30 mm body across several control protocols. Reference 1241144 runs RS485 for wired bus control, 1241146 covers DCT, and 1241970 brings Zigbee into the same footprint. A fabricator who standardizes on the Sonesse 30 mechanical fit can change the control path on a later job without reworking crowns, drives, or brackets. That consistency keeps a shop's parts bin small.
Powering a 24V DC motor
The 24V DC version changes the wiring conversation. Line voltage stops at the supply and leaves the head of the shade on low voltage, which suits low voltage rough-in, structured wiring runs, and jobs where an electrician has already pulled cable to each opening.
Somfy specifies an operating window of 21.6V to 26.4V at the motor. Voltage drop over a long run matters here. An installer pulling 100 feet of undersized cable to a bank of shades can land at the bottom of that window, so size the conductor against the run length and the number of motors on the circuit.
Low voltage also simplifies the permit picture on retrofit work in some jurisdictions, and it keeps the motor lead safe to handle while a fabricator sets limits on the bench.
Tube fit and the crown and drive question
Somfy's published minimum is 1.13 inches inside diameter, which is the bare fit. In practice the crown and drive set decides which tube you can run, because that pair centers the motor and couples it to the tube wall.
For a 1.5 inch RollEase tube, the Somfy RollEase 1.5" Crown & Drive (9020674) is the matched pair. Shops running 2 inch RollEase tube move to the larger crown and drive kit under reference 9021017 instead, and the motor itself does not change.
Bracket side, the Somfy RollEase Sonesse 30 Motor Bracket Adapter Plate (9016378) lets the round motor head seat in a RollEase bracket, and the Somfy RollEase Skyline Bracket Set, 2 inch Projection (9017910) carries the assembly at the wall with enough projection to clear a casing or a stacked treatment.
Verified specifications
| Somfy reference | 1241142, Sonesse 30 RTS 24V DC |
| Torque | 2 Nm (17.7 in-lb) |
| Speed | 25 rpm |
| Power | 24V DC, operating range 21.6V to 26.4V |
| Minimum tube inside diameter | 28.7 mm (1.13 in) |
| Motor head | Round, with interchangeable white, grey, and black covers |
| Radio frequency | 433.420 MHz |
| Noise level | 47 dB |
| Ingress protection | IP 30 |
| Warranty | 5 years |
Figures come from Somfy's own product record for reference 1241142.
RTS control and pairing
Somfy builds the RTS receiver into the motor, so the shade pairs straight to a handheld or a wall switch at 433.420 MHz without a receiver box in the ceiling. The pairing survives a power interruption.
A run of four or five shades in one room pairs neatly with the Somfy Situo 5 Channel RTS Pure Remote (1870575), where individual channels drive each opening and a group channel drives the room together. A single opening does fine on a one channel Situo.
Somfy's DecoFlex RTS wall switches give the same shade a fixed control point without pulling switch leg wiring, which keeps a retrofit clean on a finished wall. Add a TaHoma hub later for app control and scheduling.
Setting limits and head covers
The Sonesse 30 uses electronic limits with capacity for up to 100 turns of adjustment, along with soft start and soft stop that ease the fabric into each end of travel. Set the limits after the fabric is on the tube, since the roll diameter changes where the hem lands.
Somfy supplies interchangeable motor head covers in white, grey, and black. On an exposed roll or an open cassette, swapping the cover to match the bracket and fascia costs nothing and removes the one part that reads as hardware in a finished room.
The Somfy Sonesse 30 RTS 24V DC Motor (1241142) carries Somfy's five year warranty, and the product page holds the Sonesse 30 installation guide, the RTS programming sheet, and the Low Voltage Databook.
Frequently asked questions
What tube diameter does the Sonesse 30 RTS 24V DC need?
Somfy publishes 1.13 inches, or 28.7 mm, as the minimum tube inside diameter for reference 1241142. The crown and drive set you pair with the motor decides the practical tube size, with matched kits available for 1.5 inch and 2 inch RollEase tube. Confirm the tube profile before ordering the crown and drive.
How is the 24V DC version different from the 120V Sonesse 30?
The 24V DC version runs on low voltage, so line power stops at a remote supply rather than reaching the head of the shade. That suits structured low voltage rough-in and retrofit work. Somfy specifies an operating window of 21.6V to 26.4V, which makes conductor sizing over long cable runs part of the design.
Can this motor work with TaHoma and voice control?
Yes. The motor uses Radio Technology Somfy at 433.420 MHz, and a TaHoma hub bridges RTS shades into Somfy's app for scheduling, scenes, and voice assistants. Installers often hand over a Situo or DecoFlex control at completion and add the hub afterward, with no change to the shade hardware.
How quiet is the Sonesse 30 RTS 24V DC?
Somfy measures the motor at 47 dB and lists it under the Designed for Silence criteria. Soft start and soft stop reduce the audible step at each end of travel. In a bedroom or a conference room, a shade on a morning schedule cycles without pulling attention from the people in the room.
Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
