A 10 foot blackout roller in a boardroom asks more of a motor than a bedroom shade does, and Somfy caps the Sonesse 40 range at 9 Nm. The Sonesse 40 RTS 409R2 is that top step. Somfy builds it on the same 40mm interior platform as the 4 Nm and 6 Nm versions, then gears it to 14 rpm so it carries heavier fabric on a wider tube at a speed the tube can handle.
Installers reach for this reference when the shade outgrows a 6 Nm motor but the pocket still measures for a 40mm tube. Somfy's own catalog lists reference 1240382 under interior blinds and shades, and adds projection screens as a second application.
The shades a 9 Nm Sonesse 40 drives
Torque decides how much rolled fabric the motor can start and hold. Wide commercial rollers and dual shades carrying a heavy blackout layer push past what a 6 Nm motor manages on the same tube. The 409R2 answers those with 80 in-lb of starting torque.
Speed matters as much as torque here. Somfy sets this motor at 14 rpm, slower than the 36 rpm of the 4 Nm 404S2. A wide tube covers more linear travel per turn, so the slower gearing keeps the hem from racing and keeps the fabric tracking square on the tube. Projection screens benefit from the same restraint, since a screen surface shows every wobble.
Somfy rates the motor at 40 dB. Conference rooms and media rooms hold that figure against the room's own background noise, and 40 dB sits under normal speech.
Verified specifications for reference 1240382
Every figure below comes from Somfy's published record for this reference. Somfy's official name for it reads Sonesse 40 RTS 409R2 RH with Fast Connector.
| Somfy reference | 1240382 |
| Official name | Sonesse 40 RTS 409R2 RH with Fast Connector |
| Torque | 9 Nm (80 in-lb) |
| Speed | 14 rpm |
| Power supply | 120V AC, 60 Hz (108 to 132 V) |
| Rated current | 0.95 A |
| Power in operation | 120 W |
| Standby power | 0.5 W |
| Radio | RTS, 433.420 MHz, rolling code with 16 million combinations |
| Memory capacity | 12 channels |
| Sound level | 40 dB |
| Protection index | IP 44 |
| Insulation class | Class II |
| Head type | Round |
| Minimum tube inner diameter | 1.46 in (37 mm) |
| Motor length | 21.69 in (551 mm) |
| Riveting position | 20.24 in (514 mm) |
| Limit switches | Electronic, 250 turn capacity |
| Cable | 3-conductor SJTW, 1.64 ft (0.5 m), white, Fast Connector |
| Operating temperature | 32 to 140 F |
| Storage temperature | -4 to 176 F |
| Thermal protection | 4 min |
| Weight | 2.98 lb |
| Approval | UR |
| Warranty | 5 years |
| Applications | Interior blinds and shades, projection screens |
One number on that list settles most fitment questions before anything else. Somfy publishes a minimum tube inner diameter of 37 mm, which converts to 1.46 in. Order tube and hardware against that figure.
Tube minimums and the drive hardware
The 409R2 slides into a 40mm tube with a crown at the head end and a drive at the motor nose. Match the drive profile to the tube profile. A Somfy LS40 octagonal rubberized crown and drive set seats in an octagonal tube and the rubber layer damps the small vibrations a bare aluminum drive passes into the tube wall. For round or smooth-wall tube, the standard Somfy LS40 crown and drive set is the plain pairing.
Order tube to the same profile. Somfy's 40mm octagonal tube ships by the foot in 20 ft increments, so a shop cutting its own tube stock can size each opening from one order.
Measure the motor run before you cut. At 21.69 in of motor length plus the crown and the idler end, a narrow opening runs out of room fast. The riveting position at 20.24 in tells you where the crown pin lands inside the tube, which matters when you rivet the tube to the drive rather than relying on friction.
RTS control and the receiver inside the motor
Somfy builds the RTS receiver into this motor. No control conductor runs back to a switch, and no separate receiver box sits in the pocket. The motor takes power on three conductors and takes every command over 433.420 MHz.
Pair it with a handheld and the shade moves within minutes of power-up. A Somfy Situo 1 Channel RTS Pure remote drives one shade or one group from a single channel, which suits a dedicated screen or a single wide roller. The motor holds 12 channels in memory, so one motor can answer a handheld and a wall transmitter from separate addresses.
Rolling code across 16 million combinations means each command carries a fresh key. Neighboring installs on the same frequency stay clear of each other.
A wired maintained rocker switch will not drive this motor. That switch kit belongs on the 4-wire WT version of the same shade motor, where a control conductor runs back to the wall. Order a transmitter for the RTS reference.
Powering the motor and setting its limits
The 409R2 arrives with a Fast Connector on a 1.64 ft white SJTW lead. The short pigtail keeps the head end tidy and the connector lets an electrician land a longer supply run without cutting the motor cable. Somfy specifies 120V at 60 Hz with a working window from 108 to 132 V, and the motor draws 0.95 A at 120 W under load.
Standby draw sits at 0.5 W. A bank of twenty of these motors idles under 10 W between moves, which keeps the circuit calculation modest on a large commercial job.
Class II insulation means the motor carries no earth conductor. Confirm the connector on the motor you receive before you order a supply harness, since Somfy ships this reference and its non-connector siblings on the same body.
The 409R2 uses electronic limits with a 250 turn capacity. Set upper and lower stops from the transmitter after pairing, and the motor stores both. A 250 turn budget covers the longest drop a 40mm tube carries, so the limit range will not be the constraint on this motor.
Thermal protection cuts in after 4 minutes of continuous run. Somfy sizes that window for shade duty, where a full travel takes well under a minute. Commissioning a wall of shades one after another stays inside it. Cycling one motor over and over during a demo can trip it, and the motor resumes once it cools.
Keep the operating range in mind for skylights and atrium glazing. Somfy rates the motor from 32 to 140 F, and an unconditioned south-facing pocket in August climbs higher than a room thermostat suggests.
Ordering the 409R2 and the parts around it
Shade Motors Direct stocks the Sonesse 40 RTS 409R2 with the crown, drive and tube that go with it. Order the motor, the drive set that matches your tube profile, the tube itself and the transmitter in one pass, and the shade runs the day it lands.
Somfy backs the motor for 5 years.
Frequently asked questions
What tube does the Sonesse 40 RTS 409R2 fit?
Somfy publishes a minimum tube inner diameter of 37 mm, or 1.46 in, for reference 1240382. A standard 40mm octagonal or round roller tube clears that. Match the crown and drive set to the tube profile you order, since an octagonal drive will not seat in a round tube.
How much shade can 9 Nm lift?
Torque translates to lift through the rolled diameter of the fabric on the tube. 9 Nm equals 80 in-lb of starting torque, the top of Somfy's Sonesse 40 range. Somfy's 400 Series Databook carries the sizing charts that convert torque, tube diameter, and fabric weight into a maximum shade size.
Does the 409R2 need a separate RTS receiver?
No. Somfy builds the RTS receiver into the motor, and the motor stores 12 channels. Power the motor on its three conductors, then pair a Situo or Telis transmitter. No control wiring runs back to a switch location.
Which Sonesse 40 should I pick over the 409R2?
Pick the 4 Nm 404S2 at 36 rpm for light interior shades where speed matters, and the 6 Nm 406A2 at 24 rpm for mid-weight rollers. Step up to the 9 Nm 409R2 at 14 rpm when the fabric weight or the width outruns a 6 Nm motor on a 40mm tube.
Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
Specifications verified against Somfy's published product record for reference 1240382 on somfypro.ca and somfysystems.com.
