Somfy publishes a 1.46 inch minimum tube inner diameter for the Sonesse 40 RTS 404S2 RH. That single figure settles the spec before torque enters the conversation. Measure the tube first.
This motor carries reference 1001636 in Somfy's catalog and ships without a Fast Connector. Its cable runs 9.84 feet of white VVF with three conductors and stripped ends, so your electrician terminates it at a junction box or fits the plug the job calls for. Somfy sells the same motor with a Fast Connector under reference 1240380 for crews wiring a whole floor on one harness.
Shades the 404S2 drives
Somfy places the Sonesse 40 in its quietest interior shading range. At 4 Nm and 36 rpm, the 404S2 turns roller shades, solar screens, Roman shades, and wide interior blinds built on a 40 mm tube. On a 2 inch tube, 36 rpm moves close to 3.7 inches of fabric each second. A bank of shades on one scene command finishes together.
The 42 dB sound level Somfy publishes for this motor earns the Sonesse name. Somfy engineers the brake, rotor, and gearbox to absorb noise, and specifiers reach for this range in bedrooms, hotel suites, boardrooms, and screening rooms where a motor should never announce itself. The 5 year Somfy warranty covers the motor.
4 Nm covers a wide span of interior fabric, though weight and tube diameter both draw on it. A wider tube multiplies the load the motor sees at the same fabric weight, so a shade that runs well on a 1.5 inch tube asks more of the motor on a 2.5 inch tube. Somfy's 500 Series carries the higher torque ratings when a run outgrows 4 Nm, and Somfy's sizing tables give the load figures for each fabric and tube pairing.
Verified specs for reference 1001636
Every figure below comes from Somfy's own published record for 1001636.
| Specification | Somfy published value |
|---|---|
| Torque | 4 Nm (35 in-lb) |
| Speed | 36 rpm |
| Power supply | 120V AC, 60 Hz |
| Current | 0.95 A |
| Power consumption | 110 W running, 0.5 W standby |
| Radio frequency | 433.420 MHz |
| Radio range | 164.05 ft, open field |
| Channel memory | 12 |
| Head type | Round |
| Cable | VVF, 9.84 ft, white, 3 wires, stripped ends |
| Limit switch | Electronic, 250 turn capacity |
| Protection rating | IP 44 |
| Sound level | 42 dB |
| Operating temperature | 32 F to 140 F |
| Minimum tube inner diameter | 1.46 in |
| Motor diameter | 1.57 in |
| Motor length | 20.47 in |
| Warranty | 5 years |
Tube, crown, and drive
The motor body measures 1.57 inches across and needs 1.46 inches of clear tube inside diameter as a floor. A crown and drive pair carries the load between that body and the tube wall. Somfy builds the pairing for the LS40 and 400 Series head, and two sets cover most interior work: the Somfy LS40 Crown and Drive Set (9012224) and the Somfy LS40 2" Crown and Drive Set (9016352).
Match the set to the tube profile on your order rather than to the fabric width. A round tube and an octagonal tube of the same nominal size take different drives, and Somfy publishes a rubberized option for tubes that need a tighter grip. Confirm the profile against the tube spec sheet before you order the crown.
Somfy's name for this reference ends in RH, which marks the head orientation Somfy assigns it. Confirm the mounting side against the shade drawing before the order leaves, since a headrail laid out for the opposite side moves the bracket and the power drop to the other jamb. Catching that on paper costs a minute. Catching it on a ladder costs an afternoon.
The idle end takes a standard 40 mm idler and bracket. Order the bracket that matches the pocket or fascia you are mounting into, and keep the motor head and idler on the same centerline so the tube runs true.
RTS control without a control wire
Somfy builds the RTS receiver into this motor. The three conductors carry line, neutral, and ground, and nothing else runs back to the wall. That saves a low voltage pull on retrofit jobs where the wall finish already went up.
The motor holds 12 channels in memory and answers at 433.420 MHz across 164.05 feet in open field. A single shade on a bedroom window pairs with the Somfy Situo 1 Channel RTS Pure Remote (1870571). A living room with several openings and a few scenes calls for the Somfy Telis 16 Channel RTS Pure Hand Held Remote (1811081), which addresses each shade on its own channel and a whole group on another.
Adding a Somfy TaHoma hub brings the same shades into an app, onto a schedule, and under voice control. Somfy designed that upgrade path so an installer never has to swap the motor to gain app control later.
Setting limits and wiring the run
Electronic limits give you 250 turns of travel capacity and a repeatable stop at both ends. You set the upper and lower positions from a paired RTS transmitter using Somfy's RTS programming sequence, and the motor holds them through a power loss. Somfy's RTS Pocket Programming Guide walks the button sequence step by step.
On the electrical side, plan for 0.95 A and 110 W while the motor runs, and 0.5 W at rest. Several Sonesse 40 motors share a 120V circuit without trouble, though your electrician should size the breaker against the full count of motors on that home run. The IP 44 rating and the 32 F to 140 F range keep the 404S2 inside heated and cooled interior space.
Ordering the 404S2 and the parts around it
Order the motor here: Somfy Sonesse 40 RTS 404S2 RH, 120V, without Fast Connector (1001636). Add the crown and drive set that matches your tube profile, then pick the RTS transmitter that fits the room. Buyers who plan a hub later can order the motor now and add TaHoma at any point, since the receiver already sits inside the tube.
Questions installers ask about the Sonesse 40 RTS 404S2
Will this motor fit a 1.5 inch tube?
Yes. Somfy publishes 1.46 inches as the minimum tube inner diameter for 1001636, and the motor body measures 1.57 inches across. A 1.5 inch nominal tube with an inner diameter above 1.46 inches accepts the motor once the matching LS40 crown and drive set carries it. Check the tube's inner diameter, since wall thickness varies between suppliers.
What separates 1001636 from 1240380?
The cable. Reference 1001636 ships with 9.84 feet of stripped three wire VVF cable for a junction box termination. Reference 1240380 ships the same Sonesse 40 RTS 404S2 RH motor with Somfy's Fast Connector, which lets a crew plug the motor into a prepared harness. Torque, speed, radio, and noise figures match across both references.
Which remotes pair with this motor?
Any Somfy RTS transmitter at 433.420 MHz. The Situo 1 Channel RTS Pure Remote suits a single shade, and the Telis 16 Channel RTS Pure Hand Held Remote covers a room or a floor. The motor stores 12 channels, so you can pair several transmitters and a wall switch to the same shade.
Does the 404S2 work outdoors?
No. Somfy rates this motor IP 44 and lists an operating range of 32 F to 140 F, which places it in heated and cooled interior space. Somfy builds the Sunea and Altus ranges for exterior awnings and rolling shutters, and those motors carry the sealing and torque that exterior work demands.
Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
