Somfy Sonesse 404S2 RTS Motor with Fast Connector (1240380)
Somfy Sonesse 404S2 RTS Motor with Fast Connector (1240380)
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Sonesse 40 RTS 404S2 RH with Fast Connector -- ultra-quiet 40mm tubular motor for interior window coverings
The Sonesse 40 RTS 404S2 RH with Fast Connector is a wired 120V tubular motor from Somfy's quietest interior shading range, delivering 4 Nm (35 in-lb) of torque at 36 rpm for roller shades, solar screens, Roman shades, and large-format blinds. Radio Technology Somfy (RTS) is built in, so it pairs directly with Somfy remotes, sensors, and TaHoma.
Benefits
- Ultra-quiet operation, engineered around 44 dBA with noise-absorbing brake, rotor, and gearbox
- Compact 40mm design fits smaller roller tubes and tighter headrails
- Electronic limits with streamlined RTS programming
- Compatible with Somfy's full range of RTS remotes, sensors, and timers
- Voice and app control by adding TaHoma
- Backed by Somfy's 5-year warranty
Specifications
| Torque / Speed | 4 Nm (35 in-lb) / 36 rpm |
| Overall length | 20.5 in (520 mm) |
| Minimum tube inside diameter | 1.46 in |
| Radio Frequency | 433.420 MHz |
| Head type | Round |
| Control | Radio Technology Somfy (RTS), built-in receiver |
| Power | 120V AC, 60 Hz |
| Cable | 3-wire, 1.6 ft with Fast Connector |
| Limit type | Electronic |
| Protection / Noise | IP 44 / 44 dB |
| Warranty | 5 years |
Compatible with: 40mm round and octagonal tubes with matching Sonesse 40 / 400 Series crowns, drives, and brackets
Official Somfy documentation
- Sonesse 40 RTS – Spec Sheet (PDF)
- 400 Series Databook (PDF)
- RTS Pocket Programming Guide (PDF)
- Sonesse 40 RTS – Somfy Pro Product Page
Sold by ShadeMotorsDirect -- an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
Common questions
What is the Sonesse 40 RTS 404S2 with Fast Connector built for?
Part 1240380 is a wired 120V motor from Somfy's quiet Sonesse 40 range for interior roller shades, solar screens, Roman shades and large blinds. Its compact 40mm body fits smaller tubes and tighter headrails.
What torque and speed does it deliver?
Somfy rates the 1240380 at 4 Nm and 36 rpm, with electronic limits. It has a round head and needs a tube with an inside diameter of at least 1.46 in. Somfy lists a noise level of 42 dB.
How is it powered and wired?
It runs on 120V/60Hz, draws 0.95 A and uses 110 W in operation. The motor has a 1.64 ft 3-wire cable that ends in a Fast Connector, so it plugs into a matching Somfy Fast Connector power cable.
Which remotes and switches work with it?
The built-in RTS receiver pairs with Somfy RTS transmitters such as the Situo 1 and Situo 5 RTS Pure remotes (1870571, 1870575), the Telis 16 RTS Pure (1811081) and DecoFlex RTS wall switches. It stores up to 12 transmitters.
Can I control it from an app or a voice assistant?
Yes. Add a Somfy TaHoma Switch (1871037) for app control, schedules and voice commands. For a set daily routine without a hub, the Telis 1 Chronis RTS timer (1805237) raises and lowers the shade at the times you choose.
Which crowns and drives fit?
Sonesse 40 and 400 Series hardware fits. Options include the LS40 Crown and Drive Set (9012224), the LS40 Rubberized and Octagonal Rubberized sets (9016654, 9016655) and the 400 Series to 500 Series Adaptor Kit (9012226).
Couldn't load pickup availability
Replace a worn 40mm motor or build a new shade around it.
Replacing? Your fabric stays on the tube. Building new? Every part below is Somfy-matched to part 1240380.
123- 1Motor head Mounts to the bracket at the motor end.
- 2Crown Grips the inside of the tube.
- 3Drive end Takes the drive wheel that turns the tube.
Replacing a motor
-
1
Take the shade down
Cut power and lift the roller out of its brackets.
-
2
Pull the old motor
Slide it out of the tube. The fabric stays wrapped on the tube.
-
3
Fit crown and drive
Use the LS40 set that matches your 40mm tube, then slide the new motor in.
-
4
Pair and set limits
Pair your Somfy RTS remote, then set the top and bottom limits.
Not sure your tube is 40mm? Send us a photo of the label on your old motor. We'll confirm the part before you order. Ask us
Building a new shade
-
1
Measure the tube
Measure across the outside of the tube end and note its shape. That sets the crown and drive.
-
2
Pick the parts
Add the crown and drive, the motor bracket and a remote or switch from the list below.
-
3
Mount and fit
Fit the crown and drive, slide the motor into the tube and seat the head in its bracket.
-
4
Pair and set limits
Pair your Somfy RTS remote, then set the top and bottom limits.
Planning a new shade? Send us the size and tube. We'll build the parts list with you. Ask us
Find your crown, drive and bracket.
1Measure the tube end, outside edge to outside edge.
If a row lists a wall thickness, match that too.
2Pick the bracket that matches how your shade mounts.
Every bracket here fits this motor's head.
Not sure? Send us a photo of the tube end and the motor end. Ask us
What the Sonesse 404S2 RTS Motor with Fast Connector needs to run
Somfy lists every part below as compatible with part 1240380. Pick one from each row.
1Control
Built-in RTS radio. Any Somfy RTS remote, wall switch or timer pairs with it.
2Tube fit
Match the crown and drive to your tube size and profile.
3Mounting
Holds the motor head and the idle end in place.
4Also fits
Other parts Somfy lists with this product.
Somfy backs the Sonesse 404S2 RTS Motor with Fast Connector for 5 years. We handle the claim.
Somfy warranty on the Sonesse 404S2 RTS Motor with Fast Connector, part 1240380.
- What Somfy covers
- Defects in materials and workmanship, for 5 years from purchase.
- If it fails
- Email us your order number. We arrange the replacement with Somfy.
- Where it comes from
- ShadeMotorsDirect is an authorized Somfy distributor. You get the US version, new in Somfy packaging.
- Returns
- Unopened items in original packaging. Ask us for an RA number before you ship.
- Questions
- Call or chat, 8:00 AM - 7:30 PM ET.
How this motor compares
Verified Somfy specs for this motor and its closest alternatives.
| Specification | You're viewing
Somfy Sonesse 404S2 RTS Motor with Fast Connector (1240380)
| 
Somfy Sonesse 40 404S2 RS485 SDN Motor (4Nm, 36rpm) (1240562)
| 
Somfy Sonesse 40 WireFree RTS Motor, Li-ion (1240485)
| 
Somfy Sonesse 40 RTS 406A2 RH with Fast Connector (1240381)
|
|---|---|---|---|---|
| Price | ||||
| Torque (Nm) | 4.0 | 4.0 | 3.0 | 6.0 |
| Speed (rpm) | 36 | 36 | 20 | 24 |
| Control | RTS radio | RS485 (SDN) | RTS radio | RTS radio |
| Power | 120V AC | 120V AC | 12V Li-ion battery | 120V AC |
| Motor family | Sonesse 40 | Sonesse 40 | Sonesse 40 | Sonesse 40 |
| What's different | The product on this page | Same size, RS485 (SDN) control | 3.0 Nm instead of 4.0 | 6.0 Nm instead of 4.0 |
| Buy | Currently viewing | View details | View details | View details |
Guides for this product
What Is Somfy? The Motor Maker Behind Somfy Products
Somfy built the first tubular motor in 1969. Here is what the company makes today, from Sonesse motors to TaHoma,... Read
