Head type settles the bracket question before torque settles anything else. The Somfy Sonesse 50 510S2 RTS RH carries a round head, and a round head seats in a different plate than the star head build of the same 510S2. Installers who measure the plate first order once.
This motor puts 10 Nm at 32 rpm inside a 50 mm tube and takes its commands over Somfy radio. Power is the only wire you pull.
Round head sets the mounting plate
RH in the reference stands for round head. Somfy builds the Sonesse 50 510S2 in both head styles, and the electronics match across them. The casting at the control end does not. A round head drops into a round head plate, and a star head plate will not hold this motor no matter how the hardware lines up.
Check the plate you already have in the pocket before you order the motor. Retrofits go wrong at this step more than at any other. Somfy publishes the Sonesse 50 across the LT50 bracket family, so a shop that stocks LT50 hardware has the mounting side covered once the head style matches.
The idler end carries no load from the head, so the opposite bracket choice follows the tube and the pocket depth rather than the motor.
Shade types this motor drives
Somfy lists six end products for the 510S2 RTS: roller blinds, Roman blinds, pleated and cellular blinds, Venetian blinds, projection screens, and zebra blinds. Ten Nm of torque puts this motor above the 6 Nm 506S2 in the same line, which matters on a wide blackout roller or a coupled band that shares one tube.
Commercial projection screens are a common fit here. The 47.2 dB sound figure keeps the motor quiet enough for a boardroom, and 32 rpm moves a tall screen down in reasonable time. Read our guide to sizing a Somfy shade motor before you commit to a torque, because fabric weight, tube diameter, roll build-up and bearing drag all feed the answer.
Verified specifications
| Specification | Value |
|---|---|
| Somfy reference | 1001805 |
| Torque / speed | 10 Nm (88.5 in-lb) / 32 rpm |
| Control | RTS radio, 433.42 MHz |
| Radio range, open field | 164.05 ft |
| Power supply | 120 V AC, 60 Hz |
| Consumption in operation | 200 W |
| Sound level | 47.2 dB |
| Protection rating | IP 44 |
| Head type | Round head (RH) |
| Motor platform | LT50, 50 mm body |
| Minimum tube inner diameter | 1.85 in (47 mm) |
| Approval | UR |
| Warranty | 5 years |
Figures come from Somfy's published data for the Sonesse 50 510S2 RTS line.
Tube fit, crowns and drives
The LT50 body needs a tube with at least 1.85 in of clear inner diameter. Measure the inside of the tube, not the outside, and account for any welded seam that narrows the bore. A tube that passes on the outside measurement can still bind on a seam.
Two crown and drive pairings cover most of the work on this motor. For a 2.5 in round tube, the Somfy LT50 2.5 inch round crown and drive set locates the motor inside the tube and hands torque to the shade. For a 70 mm octagonal tube, reach for the Somfy octagonal LT50 70 mm crown and drive set instead.
The crown rides on the motor head and centers the body. The drive keys onto the output shaft and turns the tube. Mismatch either part and the tube either wobbles or slips under load, so order the pair that matches your tube profile rather than mixing sizes.
Pairing an RTS remote
RTS carries every command over 433.42 MHz radio. The motor needs line voltage and nothing else, which keeps the control run out of the wall. Retrofit jobs in finished rooms lean on this.
Pair the motor with the Somfy Situo 1 Channel RTS Pure remote for single shade control. Somfy rates the radio link at 164.05 ft in open field. Plaster, brick, metal studs and steel pockets cut into that figure, so plan a shorter working distance inside a building and add an RTS repeater on long runs.
Somfy's wider ecosystem opens up from the same radio. TaHoma brings the motor onto a phone and into schedules, and Soliris sun sensors drop the shade when solar gain climbs. Give this motor radio control rather than a wired wall switch, since the 3-wire power lead carries no control conductors.
Install notes worth knowing
Somfy ships the 510S2 RTS RH with a 3-conductor power lead carrying line and neutral plus a ground conductor. Terminate it in a junction box inside the pocket and leave slack for service.
Set the limits from the remote with Somfy's programming sequence. Run the shade to each end by hand on the first pass and confirm the fabric tracks straight on the tube before you lock the stops in.
IP 44 covers interior installation and protected locations. Keep this motor out of direct weather and out of unventilated pockets above a hot glazing line. The motor runs at 47.2 dB, which sits below conversation level and suits bedrooms and meeting spaces.
Confirm the connector style on the motor you receive against the cable you have on the bench. Somfy builds this line with more than one lead style, and five minutes with a tape and a torch at the pocket saves a return trip.
Buy the motor and the crown and drive set for your tube profile in one pass. The Sonesse 50 510S2 RTS RH arrives ready for a round head plate, and the 2.5 inch round crown and drive set or the 70 mm octagonal set completes the tube side. Add the Situo 1 RTS remote and the shade runs on the bench before it reaches the window.
Somfy backs the motor for five years. That warranty and the 47.2 dB acoustics keep specifiers returning to the Sonesse 50 line for occupied interiors. The RTS ecosystem gives them room to grow the job later.
Frequently asked questions
What does RH mean on a Somfy motor reference?
RH stands for round head. Somfy builds the Sonesse 50 510S2 RTS with a round head casting at the control end, and the mounting plate has to match that shape. A star head plate will not accept a round head motor, so confirm the head style against the bracket already in your pocket before ordering.
What tube does the Sonesse 50 510S2 RTS RH fit?
The LT50 body needs a tube with 1.85 in (47 mm) of clear inner diameter or more. Somfy covers 2.5 in round tube with the 9012231 crown and drive set and 70 mm octagonal tube with the 9012234 set. Measure the inner bore and allow for a welded seam.
How much torque does the 510S2 deliver?
Somfy rates the 510S2 at 10 Nm, which converts to 88.5 in-lb, running at 32 rpm. That sits above the 6 Nm 506S2 in the same line and suits wide blackout rollers and commercial projection screens.
Does this motor work with a wired wall switch?
Give this motor RTS radio control. The 3-conductor lead carries line and neutral plus a ground conductor, with no control conductors for a maintained switch. A Situo or Telis RTS remote and a TaHoma hub both talk to it over 433.42 MHz.
Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
