A 12 volt supply narrows the motor list fast. Most tubular motors on a shade job run on 120V AC, and moving to low voltage changes the torque you can order and the cable you pull. Somfy builds the Simu T3.5 line for that supply. Reference 2006977 is the 10 Nm 12 rpm version, the highest torque in the 12V DC T3.5 range, with a round head sized for 40 mm class tube.
Pick this motor when the power is 12 volts
Installers reach for the T3.5 10 Nm on openings where a regulated DC supply already runs to the pocket. Solar screens on a pergola, shades in a vehicle or a boat cabin, and retrofits behind a low-voltage transformer all land on this spec. Somfy rates the motor for interior window coverings and exterior solar screens, so a screen on a west elevation sits inside the published application list.
The motor draws 30 W while it runs and 0 W at rest. Rated current is 2.4 A. Size the supply from those two figures, and add headroom when two motors share one transformer. Somfy publishes a 9 V minimum and a 15 V maximum for the circuit, which leaves room for voltage drop across a long cable run. A supply that sags under load will stall a motor that the torque table says is large enough.
The shades a 10 Nm T3.5 drives
Ten newton metres covers a wide band of interior fabric. Roller shades, solar screens, blackout fabric and light dual-shade assemblies on 40 mm tube sit inside that budget on most residential openings. Torque demand climbs with fabric weight, finished width and tube diameter. The 12 rpm output speed holds travel time steady on a tall drop, which matters on a bank of shades that buyers expect to move together.
Two measurements decide the spec. Weigh the fabric and the tube as a finished assembly, then record the drop. A heavy blackout fabric on a 10 foot drop asks more of the motor than a 3 percent solar screen of the same width. Builders who skip that step order torque twice.
Verified specs for reference 2006977
| Specification | Value |
|---|---|
| Torque / Speed | 10 Nm / 12 rpm |
| Model designation | T3.5 10/12 12V C2,5M WHITE/1 |
| Power supply | 12V DC, 9 V to 15 V, sold separately |
| Rated current | 2.4 A |
| Power consumption | 30 W running, 0 W standby |
| Control | Wired, 2-wire DC |
| Limit switch | Mechanical, 40 turns |
| Head type | Round |
| External diameter | 1.39 in |
| Minimum tube inner diameter | 1.34 in |
| Unwrapped length | 14.69 in |
| Cable | VVF, 2 wires, white, 8.2 ft, stripped ends |
| Protection | IP 44, Class III insulation |
| Operating temperature | 14°F to 104°F |
| Noise level | 72 dB |
| Warranty | 5 years (Somfy) |
Somfy publishes every figure above against reference 2006977 on its own product pages.
Tube fit, crowns and the mounting plate
The motor body measures 1.39 in across and calls for a tube with a minimum inner diameter of 1.34 in. That places it in the 40 mm class: 40x1 and 40x1.5 round tube, plus 40 mm octagonal, each with Somfy T3.5 crowns and drives that match the head. The Somfy T3.5 38mm Round (Tube 40x1) tube is the stock pairing for this motor, and it carries the drive profile the T3.5 head expects.
Use 40 mm class crowns and drives on this motor. Hardware cut for 47 mm tube will not seat on the T3.5 head, and an adaptor built for the larger LT50 body belongs on a different motor.
Unwrapped length runs 14.69 in. Subtract the motor, the bracket and the idler from the finished width before anyone cuts tube. The round head mounts on a T3.5 bracket, and the Somfy Motor Plate (9012258), which Somfy also calls the R8 adaptor plate, gives the head a flat mounting face where a pocket or a fascia offers no room for a pin-mount bracket.
Wiring and limits on a two-wire DC motor
Somfy fits a VVF cable with two conductors, white, 8.2 ft long, stripped at the ends. Travel direction follows polarity, so a reversing switch or a DC shade controller swaps the two conductors to send the shade the other way. Earth bonding does not apply on this motor, because Somfy builds it to Class III insulation on a low-voltage circuit. Pull the cable with the same care you would give line voltage anyway, since a crushed conductor on a 2.4 A load still runs hot.
The limit switch is mechanical with 40 turns of capacity. Set the two limits once at install with the adjustment on the head, then run the shade end to end twice to confirm the fabric lands where the customer wants it. A mechanical limit holds its setting through a power cut, which keeps a service call off the calendar after an outage.
IP 44 covers splash from any direction. Keep the head and the cable entry clear of standing water, and give an exterior screen a hood or a cassette. Operating range runs 14°F to 104°F, wide enough for a covered exterior screen through most of the year in a temperate climate. Noise measures 72 dB, so plan on a shade that announces itself in a quiet room.
Order the 10 Nm T3.5 and the parts around it
The Somfy Simu T3.5 10Nm 12rpm 12V DC Motor (2006977) ships as a genuine Somfy reference with the five year warranty behind it. Order it with the 38mm round 40x1 tube when the assembly starts from bare parts, and add the Motor Plate (9012258) when the bracket pocket needs a flat face. A regulated 12V DC supply and a wired reversing control finish the circuit.
Buyers who need the same T3.5 head on a 24V circuit have the 10 Nm 24V version and the 6 Nm models to choose from, and the mechanical limit, the round head and the 40 mm tube fit carry straight across the line.
Common questions
What power supply does the Somfy T3.5 10Nm 12V motor need?
Somfy specifies a 12V DC supply, with the motor rated to run between 9 V and 15 V. It draws 30 W and 2.4 A under load and 0 W at rest. Pick a regulated supply that holds voltage at the motor under full load, and add capacity when more than one motor shares the transformer. The supply ships separately from the motor.
Which tube fits the T3.5 10Nm 12rpm 12V motor?
The motor body is 1.39 in across and needs a minimum inner tube diameter of 1.34 in, which puts it in the 40 mm class. That covers 40x1 and 40x1.5 round tube and 40 mm octagonal, paired with Somfy T3.5 crowns and drives. Hardware cut for 47 mm tube will not seat on this head.
How do you reverse the direction on this motor?
Direction follows polarity on a two-wire DC motor. A reversing switch or a DC shade controller swaps the two conductors of the VVF cable to change travel. Somfy supplies the cable at 8.2 ft with stripped ends, so the installer terminates it at the switch or the controller.
Can this T3.5 motor go outside on a solar screen?
Somfy lists exterior solar screens among the applications for reference 2006977 and rates the motor IP 44 against splashing water. Mount it under a hood or inside a cassette, keep the cable entry out of standing water, and hold the opening within the 14°F to 104°F operating range.
Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
