Somfy builds the Sonesse ULTRA 506A2 in two head orientations at the same torque. Reference 1002558 carries the star head. Reference 1002560 carries the round head. The head you order sets the bracket, the bracket sets the pocket layout, and the pocket layout is the one thing nobody wants to revisit after the tube is cut.
Star head fit decides the bracket you order
The star head on 1002558 seats into Somfy's 120mm square spring-ring bracket, part 9763503, which Somfy builds for the 120V AC Sonesse ULTRA 50 range. That bracket gives you a square mounting footprint and a spring ring that captures the motor head without adaptation. Order it with the motor and the pocket carpenter gets one dimension to work to.
The product listing for 1002558 still carries a square-head line borrowed from the DC Sonesse ULTRA. Somfy's own D-0039 databook for the Sonesse ULTRA 50 RA prints 1002558 as the star head reference and 1002560 as the round head, and Somfy's record is the one to build to. Anyone who already ordered brackets against the listing line should check them against the 9763503 part number before the install day.
Shades this 6 Nm motor drives
Somfy positions the Sonesse ULTRA platform for interior window coverings and projection screens. At 6 Nm and 24 rpm the 506A2 sits in the middle of the range, and it handles the roller shades that show up in conference rooms, media rooms and open-plan offices where a motor running at 38 dB disappears under the HVAC. Blackout fabric on a wide commercial opening is the classic use. Projection screens are the second, and Somfy names them on the product record.
Interior duty is the boundary. Somfy rates this motor IP 31, so it belongs inside the building envelope rather than in an exterior screen or awning pocket. Installers working an outdoor opening should step across to Somfy's exterior ranges built for that exposure.
Verified specifications
Every figure below comes from Somfy's published record for reference 1002558, either the somfysystems.com product page or the D-0039 Sonesse ULTRA 50 RA databook.
| Somfy reference | 1002558 |
| Official name | Sonesse ULTRA 506A2 |
| Torque | 6 Nm (53 in-lb) |
| Speed | 24 rpm |
| Power supply | 120V AC, 60 Hz |
| Current | 0.95 A |
| Power in operation | 114 W |
| Standby power | 0 W |
| Sound level | 38 dB |
| Protection rating | IP 31, interior use |
| Head type | Star |
| Motor length | 31.4 in (798 mm) |
| Minimum tube inner diameter | 47 mm (1.85 in) |
| Limit switch | Rapid Adjustment, 46 turn capacity |
| Control | Standard 4-wire |
| Applications | Interior window coverings, projection screens |
| Warranty | 5 years |
The product listing prints 6 Nm as 52 in-lb. The conversion lands on 53, and the Somfy databook agrees. Nothing in the fitment changes either way, though a spec sheet going to an architect should carry the Somfy number.
Tube, crown and drive fit
Somfy publishes a minimum tube inner diameter of 47 mm, or 1.85 inches, for the Sonesse ULTRA 50. Measure the inside of the tube rather than the outside. A 2 inch round tube clears that figure with room to spare, and a 2.5 inch tube does the same at the larger drop weights this torque supports.
The drive wheel mounts on the motor output shaft and locks into the tube profile. Somfy offers the LT50 2 inch soft clip drive (9206089) for 2 inch round tube and the LT50 2.5 inch soft clip drive (9206041) for the larger profile. Soft clip retention lets you press the drive home by hand and still get a grip that will not slip under a full blackout roll. Pair the drive with the crown that matches the same tube size, and the motor runs concentric through the whole drop.
The bracket end completes the assembly. The square spring-ring bracket, 120mm (9763503) is the Somfy hardware the ULTRA 50 AC range was engineered around, and it takes the motor head at one end while the idler carries the other.
Wiring a standard 4-wire Sonesse ULTRA
This reference takes standard 4-wire control, which means an installer feeds it from a wired switch, a relay card or a dry contact output on a building system. Somfy sends line, neutral, up and down on the motor cable. A maintained rocker switch will drive it. A momentary switch wired through a relay will drive it as well, and larger jobs usually take that route because the relay lets a lighting or shade controller own the schedule.
Radio remotes have no path into this motor. The 506A2 in 4-wire form carries no receiver, so RTS handhelds and Zigbee hubs cannot reach it. Anyone who wants app control on a Sonesse ULTRA 50 should look at the RTS or RS485 references in the same family instead of adding a receiver to this one. The motor draws 0.95 A and 114 W while running, and it sits at 0 W once it stops, which keeps the circuit math simple when you gang several shades on one breaker.
Rapid Adjustment limits on a 46 turn head
Somfy fits the RA head with a Rapid Adjustment limit mechanism rated for 46 turns of travel. Set the upper limit first with the fabric rolled onto the tube, then run the shade down and set the lower limit at the sill. The 46 turn capacity covers the drops a 6 Nm motor handles on a 2 inch tube, and installers who need longer travel should size up within the Somfy range rather than stretching this head.
One habit saves callbacks: dry-fit the motor in the bracket and run both limits before the fabric goes on the tube. Somfy's 38 dB rating makes the motor hard to hear across a finished room, and a limit set by ear on a noisy site tends to land a half inch off.
The Somfy Sonesse ULTRA 50 506A2 120V 4-wire motor, star head (1002558) covers the quiet interior roller work that Somfy designed the ULTRA platform for. Order the drive and crown that match your tube diameter, add the 9763503 bracket for the head end, and the assembly is complete before the fabric arrives. Somfy backs the motor for five years.
Questions installers ask
Which bracket fits the Sonesse ULTRA 506A2 star head?
Somfy part 9763503, the 120mm square bracket with a spring ring, is built for the 120V AC Sonesse ULTRA 50 range and takes the star head on 1002558 without an adaptor. Order it alongside the motor so the pocket carpenter works to a single square footprint at the head end.
What is the minimum tube size for the 1002558 motor?
Somfy publishes a 47 mm minimum tube inner diameter, which converts to 1.85 inches. Measure the inside of the tube rather than the outside diameter, because wall thickness varies between profiles. A 2 inch round tube clears the figure, and Somfy offers soft clip drives for both 2 inch and 2.5 inch tube.
How quiet is the Sonesse ULTRA 506A2?
Somfy publishes 38 dB for this reference and carries the Designed for Silence mark on the ULTRA platform. That level sits under typical office ventilation noise, which is why specifiers reach for the ULTRA range in boardrooms, bedrooms and screening rooms where a shade moving mid-meeting should go unnoticed.
Can an RTS remote control this motor?
No. Reference 1002558 is the standard 4-wire version with no radio receiver, and it runs from a wired switch or a relay output. Installers who want handheld or app control should specify the RTS or RS485 references in the Sonesse ULTRA 50 family, which carry the control electronics inside the motor.
Specifications verified against somfysystems.com reference 1002558 and Somfy document D-0039, Sonesse ULTRA 50 RA.
Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
