A 3 Nm tubular motor earns its place on small interior shades and compact exterior solar screens. The Simu T3.5 3Nm 23rpm 24V, Somfy reference 2006974, drives those shades from a low-voltage DC supply and turns at 23 rpm. Installers choose it when the fabric is light, the roll stays short, and the job runs on 24V instead of line voltage.
Shades the 3 Nm T3.5 drives
Somfy lists this motor for interior window coverings and exterior solar screens. Both applications put modest load on the tube. A light roller fabric on a 40 mm class tube at a residential width sits inside 3 Nm with headroom to spare, and the 23 rpm output keeps travel time short on a shade that only has a few feet to cover.
Load climbs with fabric weight, roll diameter and drop. An installer sizing a screen with a heavier mesh, a wider opening or a long drop steps up the torque rather than running the 3 Nm motor at its ceiling. Somfy builds the same T3.5 body at 6 Nm and 10 Nm for that reason, and the head, tube fit and wiring stay the same across the range.
Low-voltage DC changes the rest of the design. A 24V supply feeds the motor through two wires, which keeps the head end of the tube clean and keeps the circuit outside line-voltage wiring rules. Battery-backed and solar-fed systems run on the same principle.
Tube sizes this motor seats in
Tube fit decides this purchase before torque does. The motor body measures 1.39 in across, and Somfy sets the minimum tube inner diameter at 1.34 in. That puts it in the 40 mm class: 40x1 and 40x1.5 round tube, plus 40 mm octagonal tube with the matching crown and drive.
The Somfy T3.5 38mm Round Tube 40x1 (9001495) pairs with this motor as a direct fit. Cut it to the shade width, seat the crown at the motor end, and drive the opposite end through the idler. Parts built for 2 in tube will not seat on a T3.5, so match the crown and drive to the tube profile you ordered.
Verified specs for reference 2006974
| Somfy reference | 2006974 |
| Somfy product code | MOTOR T3,5 3NM/23RPM 24VDC X1 |
| Torque / speed | 3 Nm / 23 rpm |
| Power supply | 24V DC, 18 to 30 V range |
| Rated current | 0.9 A |
| Consumption | 22 W in operation, 0 W standby |
| Control | Wired, 2-wire DC |
| Limit switch | Mechanical, 40 turns of travel |
| Head type | Round |
| External diameter | 1.39 in |
| Minimum tube inner diameter | 1.34 in |
| Cable | VVF, 2 wires, white, 8.2 ft, stripped ends |
| Protection | IP 44, Class III insulation |
| Noise level | 68 dB |
| Applications | Interior window coverings, exterior solar screens |
| Warranty | 5 years |
Power supply, wiring and the mechanical limits
The motor arrives with a two-wire VVF cable, 8.2 ft long, white, with stripped ends. You supply the power source. A regulated 24V DC supply sized to the 0.9 A draw runs one motor, and an installer running several shades on one supply adds the current figures together before choosing the transformer.
Somfy publishes 22 W in operation and 0 W at rest. Nothing sits on the circuit between commands, which matters on a solar or battery system where standby drain sets the recharge interval. The 18 to 30 V range gives the circuit room for voltage drop over a long cable run.
Polarity sets direction on a two-wire DC motor. Swap the two conductors at the controller and the tube turns the other way, which lets you reverse travel after the shade is hung. IP 44 and Class III insulation cover a screen under a soffit or inside a protected reveal. Confirm the connector on the motor you receive before you cut anything back.
This motor uses a mechanical limit switch with 40 turns of travel. You set the two end points once with the adjustment buttons on the head, and the motor holds them for the life of the installation. No programming, no remote pairing, no controller to configure. Multiply the tube circumference by 40 and you have the maximum length of fabric those limits will carry.
Run the shade to each end before you trim the fabric. Set the lower limit with the hem bar where you want it to rest, then set the upper limit with the roll clear of the bracket. Both adjustments stay accessible at the head after the shade is hung.
Crowns, drives and the motor plate
The round head on this motor needs a bracket or plate that accepts a round profile. The Somfy Motor Plate (9012258) gives you that mount, and Somfy names it as the R8 adaptor plate for the T3.5. Fix the plate to the headbox or the window frame, seat the head, and the motor carries the roll from one end while the idler takes the other.
Four parts complete the mechanical side of a T3.5 shade: the bracket or plate at the motor end, the crown that centers the motor inside the tube, the drive that transfers torque to the tube wall, and the idler end cap at the far end. Order the crown and drive to match the tube you cut. A 40x1 round tube takes a different drive from 40x1.5 round, and octagonal tube takes its own pair.
The 3 Nm step in the T3.5 range
Somfy builds the T3.5 at 3 Nm, 6 Nm and 10 Nm, in 12V and 24V versions of each. This reference sits at the bottom of that ladder on the 24V side, at 23 rpm, the fastest output in the family. The T3.5 6Nm 18rpm 24V (2006976) doubles the torque at 18 rpm for a heavier screen on the same 24V supply and the same 40 mm class tube.
Order the 3 Nm version for light interior fabric and small screens. Order the 6 Nm or 10 Nm version when the fabric weight, the roll diameter or the drop pushes past what 3 Nm will lift. The brackets, crowns, drives and wiring carry over, so a change of torque does not change the rest of the parts list.
Frequently asked questions
What power supply does the Simu T3.5 3 Nm 24V motor need?
A regulated 24V DC supply, sold separately. Somfy publishes an operating range of 18 to 30 V and a rated current of 0.9 A for this reference, with 22 W drawn in operation and 0 W at rest. Size the transformer to the total current of every motor on the circuit, and allow for voltage drop over long cable runs.
What tube does reference 2006974 fit?
Tubes in the 40 mm class with a minimum inner diameter of 1.34 in. That covers 40x1 and 40x1.5 round tube and 40 mm octagonal tube, each with its own matching Somfy crown and drive. The motor body measures 1.39 in across, so a tube with a smaller bore will not accept it.
Does this motor work with a Somfy RTS remote?
No. Reference 2006974 is a wired two-wire DC motor with no radio receiver inside the head. Control comes from a wired switch or a DC controller on the supply side. A Somfy radio motor or an external receiver covers an installation that calls for remote control.
How much travel do the mechanical limits allow?
Forty turns of tube rotation between the two end points. Tube circumference times 40 gives the maximum fabric length those limits will carry, which covers residential interior drops on a 40 mm tube. You set both end points once at the head with the adjustment buttons, and they hold without a controller.
Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
