Short answer: The round head RTS version of the Somfy Sonesse 50 120V AC motor is the Sonesse 506S2 RTS RH (1001806). It turns 6 Nm at 32 rpm on 120V AC, 60Hz, answers any Somfy RTS control, needs a tube with at least 1.85 in of inside diameter and a round head bracket, and lists at $395 at Shade Motors Direct in October 2026.
Price is the first number buyers ask about on this motor, and the head casting is the second. The Somfy Sonesse 506S2 RTS RH (1001806) carries a round head, a radio receiver built into the body, and a three-wire 120V lead. Get the bracket right and the rest of the job follows the tube.
Price and the part number behind it
A search for a "Sonesse 50 120V AC motor" lands on a whole family. Somfy builds the Sonesse 50 in several torques, head styles and control types. This reference pins down three of those choices at once: 6 Nm of torque from the 506S2 gearbox, RTS radio control, and a round head.
Shade Motors Direct lists the 1001806 at $395 as of October 2026. That price covers the motor with its integrated RTS receiver and a 9.84 ft SJTW power lead. Crowns, drives, a bracket and a remote sit outside the box; the 2.5 in crown and drive below cost under $10 together. Our Somfy motors price guide covers the wider range if you are still weighing platforms.
Two siblings share the 506S2 name. The star head 506S2 RTS (1001809) runs the same 6 Nm at 32 rpm and drops into star head brackets, and our Sonesse 506S2 RTS star head guide covers it. The round head 510S2 RTS RH (1001805) steps up to 10 Nm in the same body. Read the reference on the old motor label before you order.
Shades the 506S2 RTS RH drives
Somfy lists this motor for interior shades. Six newton meters at 32 rpm suits a mid-size roller or solar shade on a 2.5 in tube, a blackout roller in a bedroom, or a pair of shades coupled on one tube in an office. Wider and heavier fabric pushes the job toward the 10 Nm 510S2.
The 45.1 dB sound rating keeps the motor quiet in occupied rooms. Somfy rates it IP 44 and Class I, so it runs on a grounded 120V circuit inside a headrail or pocket. Fabric weight, drop and tube diameter together set the torque, and our guide to sizing a Somfy shade motor walks through the math.
Verified Somfy specifications
| Somfy name and reference | Sonesse 506S2 RTS RH, 1001806 |
| Torque / speed | 6 Nm (53.1 in-lb) / 32 rpm |
| Power supply | 120V AC, 60Hz (108 to 132 V) |
| Rated current | 1.2 A |
| Consumption, running / standby | 140 W / 0.5 W |
| Control | RTS radio, 433.420 MHz, integrated antenna |
| Radio range, open field | 164.05 ft |
| Memory capacity | 12 |
| Sound level | 45.1 dB |
| Protection / insulation | IP 44, Class I |
| Head type | Round |
| Limits | Electronic, 250 turns, repeatability +/- 5 |
| Minimum tube inside diameter | 1.85 in (47 mm) |
| Motor tube external diameter | 1.77 in (45 mm) |
| Length / riveting position | 26.1 in / 25.2 in |
| Cable | SJTW, 3 wires, 9.84 ft, white, stripped ends |
| Working temperature | -4 to 140 F |
| Thermal protection time | 4 min |
| Approval / warranty | UR / 5 years |
Figures come from Somfy's product page for reference 1001806.
Round head bracket, tube, crown and drive
The round head decides the bracket. Use a bracket built for a round head LT50 motor, since a star head bracket will not hold this casting. On a replacement, read the head style off the old motor label and the bracket in the pocket before you order.
The tube needs 1.85 in of clear inside diameter. Measure inside the bore and check for a weld seam. On 2.5 in round tube, the Somfy LT50 2.5 inch crown (9707026) centers the motor head inside the tube, and the Somfy LT50 2.5 inch hard clip drive (9206019) keys onto the output shaft and turns the roller. Order the two as a pair for the same tube size.
Coupled shades and wide blackout fabric add load on the drive end. Check the roll weight against the 6 Nm rating with the sizing guide before you fix the tube length.
Controls that pair with it
The radio lives inside the motor, so the 120V lead carries power and nothing else. Any Somfy RTS transmitter can run it, and the motor holds up to 12 of them in memory.
The Somfy Situo 5 Channel RTS Pure remote (1870575) runs this shade on one channel and up to four more shades or groups on the rest. For a fixed control by the door, the Somfy DecoFlex 5 Channel RTS WireFree wall switch (1810813) mounts like a light switch with no wiring behind it.
Pairing order matters on a new motor: set the direction and limits with the first control, then add the others from it. Somfy's programming sequence sits in the RTS install guide in our Somfy spec library. A TaHoma Switch hub adds app, voice and schedule control over the same radio.
Wiring and install notes
The three-wire SJTW lead carries hot, neutral and ground. Terminate it in a junction box or a plug at the pocket, and leave a service loop so the shade can come down without cutting wire. Somfy publishes this motor for a 120V, 60Hz supply with a 108 to 132 V working window.
Limits are electronic with 250 turns of capacity, which covers a tall drop on a 2.5 in tube. Set them from the remote, then run the shade end to end twice and check that the fabric tracks straight.
Somfy publishes a 4 minute thermal time for this motor. Space out long test cycles on the bench so the thermal protection does not trip mid-setup.
Order the Sonesse 506S2 RTS RH with the crown and drive for your tube in one pass, add a Situo or DecoFlex control, and the shade runs on the bench before it reaches the window. The full lineup sits in our Somfy Sonesse motors collection, and Somfy backs this motor for five years.
Frequently asked questions
How much does a Somfy Sonesse 50 120V AC motor cost?
Shade Motors Direct lists the Sonesse 506S2 RTS RH (1001806) at $395 as of October 2026. That price includes the integrated RTS receiver and a 9.84 ft SJTW lead. Plan a little more for the crown, drive, round head bracket and a remote. Torque, head type and control protocol move the price across the Sonesse 50 range.
What does RH mean on the 506S2 RTS?
RH stands for round head, the shape of the casting at the motor's control end. A round head motor needs a round head bracket. Somfy also builds the 506S2 RTS with a star head under reference 1001809, and the two do not share brackets. Check the old motor label and the bracket in the pocket before ordering.
What tube does the Sonesse 506S2 RTS RH fit?
Somfy sets a minimum tube inside diameter of 1.85 in (47 mm). The motor body measures 1.77 in across and 26.1 in long. On 2.5 in round tube, pair the LT50 2.5 inch crown 9707026 with the 2.5 inch hard clip drive 9206019. Measure inside the bore and allow for a weld seam.
Can a wall switch control this motor?
Yes, through RTS radio. The 3-wire lead carries power only, so a wired maintained switch has no control conductor to drive. A DecoFlex 5 Channel RTS WireFree wall switch mounts at the door with no wiring, and the motor stores up to 12 RTS controls, including Situo remotes and a TaHoma hub.
Sources: Somfy Pro product page for the Sonesse 506S2 RTS RH, reference 1001806 (somfypro.com).
Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
