A 50 Nm motor with a hand crank sits in a narrow slot. Installers reach for the Somfy 550R2 CMO when the shutter or awning has to move during an outage, and when the tube is wide enough to swallow a 50mm motor with a CMO head on the end. Both conditions matter. Miss either one and the motor arrives correct on paper and wrong on the wall.
The Somfy 550R2 CMO (1051014) is Somfy's LT50-series wired tubular motor at the top of the 50mm torque range, factory-fitted with a 4-conductor cable and a CMO override head. Somfy names it 550R2 50/14 CMO 2464 2M - UN. This guide covers what it drives, the tube and hardware it needs, and the figures Somfy publishes for the reference.
The crank override changes what this motor is for
CMO stands for compact manual override. Somfy builds a gear take-off into the motor head, and an installer hangs a crank eyelet and rod from it. Power fails, the operator turns the crank, and the shutter still closes. Somfy lists two applications for this reference: awnings and rolling shutters. Storefront security shutters and exterior awnings on a commercial facade are the usual jobs, because those are the closures a building owner needs to move whether or not the panel is live.
Somfy publishes 50 Nm at 14 rpm for 1051014. That torque carries heavy aluminum shutter curtains and wide projection awning fabrics on a 2.5 inch tube. The speed sits at the slow end of the LT50 range, which is what a 50 Nm motor gives you: torque and speed trade against each other inside the same 50mm frame. An installer choosing between this and the 40 Nm 540R2 should weigh curtain weight against cycle time.
The CMO head also settles the bracket question before anything else. A CMO head will not seat in an LT50 star-head bracket. Somfy sells a dedicated CMO bracket for the job, and ordering the wrong one is the expensive version of this mistake.
Verified Somfy specifications
Every figure below comes from Somfy's own e-catalogue entry for reference 1051014.
| Specification | Published value |
|---|---|
| Somfy designation | 550R2 50/14 CMO 2464 2M - UN |
| Somfy reference | 1051014 |
| Torque | 50 Nm (440.1 in-lb) |
| Speed | 14 rpm |
| Supply | 120 V AC, 60 Hz |
| Current | 2.1 A |
| Power in operation | 250 W |
| Standby power | 0 W |
| Head type | CMO |
| Limit switches | Mechanical, 34-turn capacity |
| Minimum tube inner diameter | 1.85 in |
| Motor diameter | 1.97 in |
| Motor length | 30.98 in |
| Cable | 2464 4-conductor, 6.56 ft, stripped ends, removable |
| Protection rating | IP 44 |
| Insulation class | Class I |
| Operating temperature | -13 to 158 F |
| Thermal protection | 5 min |
| Weight | 7.1 lb |
| Applications | Awnings, rolling shutters |
| Approval | UR |
| Warranty | 5 years |
Somfy publishes no sound level for this reference. Treat any dB figure you find elsewhere as a distributor estimate rather than a Somfy number.
Tube, crown, drive, and bracket fit
Start at the tube. Somfy's published minimum internal diameter is 1.85 inches, and the motor body measures 1.97 inches across. Measure the inside of the tube you already own before you order, because a 2 inch nominal tube can come in under that minimum once you account for wall thickness and a seam.
The motor ships bare. Crown and drive come separately, and they are the pair that adapts the 50mm motor to your specific tube profile. For a 70mm octagonal tube, the Somfy Octagonal LT50 70mm Crown and Drive Set (9012234) gives you both halves in one part number. For a 2.5 inch round tube, order the Somfy LT50 2.5" Crown (9707026) with the matching Somfy LT50 2.5" Hard Clip Drive (9206019). The crown carries the motor inside the tube. The drive transfers rotation to the tube wall.
At the head end, the Somfy Motor Bracket for Sunea CMO RTS US (9015802) accepts the CMO head profile. Somfy also offers a metric CMO universal bracket for installers working to metric hardware. Check which pocket depth your headbox gives you, then pick the bracket that leaves the crank eyelet reachable.
Order the crank rod and eyelet with the motor. A CMO motor without a crank assembly gives you the override gearing and no way to turn it.
Wired control and switch wiring
This motor has no radio receiver. Somfy supplies it as a wired 4-conductor unit, and control comes from line voltage on the up leg or the down leg. A maintained rocker switch, a keyed switch, a dry-contact relay board, or a building automation interface all drive it the same way. The cable is 6.56 feet of 2464 4-conductor with stripped ends, and Somfy makes it removable, so you can replace a damaged lead in the field.
RTS remotes, Situo handhelds, and DecoFlex wall switches will not operate this motor. Those controls talk to a receiver, and there is none here. Installers who want radio control on this platform should look at the 550R2 RTS CMO reference instead, or add an external RTS receiver ahead of the motor leads. A customer expecting to pair a remote to a wired motor is the most common support call on this SKU.
Class I insulation means the motor needs a ground conductor. Wire the green lead to building ground and keep the run inside a listed enclosure or conduit per local code.
Mechanical limit setting on a 34-turn head
Somfy gives this motor mechanical limit switches with a 34-turn capacity. An installer sets them with the two screw adjusters on the head, turning each one to move its limit point, then running the shutter to verify. Count your tube revolutions against that 34-turn ceiling during layout. A tall shutter on a small tube can run out of turns before it reaches the sill.
Mechanical limits hold their setting through a power loss with nothing to relearn, which pairs well with the crank override. Crank the shutter by hand during an outage, restore power, and the motor still knows where its stops are.
Somfy rates the motor for a 5 minute duty period, with thermal protection stepping in after that. Rolling shutters and awnings both finish a full travel well inside the window.
Catalog notes worth checking before you order
Two details on the product page deserve a second look. Our title carries an RA designation; Somfy's own catalogue name for 1051014 reads 550R2 50/14 CMO 2464 2M - UN, with no RA in it. The SKU, the 50 Nm rating, and the CMO head all match Somfy's reference, so you are ordering the right motor. Our page also describes the cable as 6 feet, where Somfy publishes 6.56 feet, a 2 metre lead. We are correcting both.
Our compatible-parts list for this SKU also carries RTS remotes and DecoFlex switches. Those belong to the RTS version of this motor. Skip them here and buy a wired switch or relay.
Frequently asked questions
What tube size does the Somfy 550R2 CMO need?
Somfy publishes a minimum internal tube diameter of 1.85 inches for reference 1051014, with a motor body diameter of 1.97 inches. Measure the actual inside of your tube rather than trusting a nominal size. A crown and drive set matched to your tube profile completes the fit, and Somfy sells those separately from the motor.
Can I use an RTS remote with this motor?
No. Somfy builds 1051014 as a wired 4-conductor motor with no radio receiver, so Situo, Telis, and DecoFlex controls have nothing to pair with. Drive it from a wired switch, a dry-contact relay, or a building automation output. Somfy's 550R2 RTS CMO reference covers the same torque with radio control built in.
Does the manual override need extra parts?
Yes. The CMO head provides the override gearing, and you add a crank eyelet and rod to turn it. Somfy sells those as separate part numbers sized to the drop from your headbox to a reachable height. Order them with the motor, and confirm the eyelet clears the bracket you chose.
What torque does 50 Nm give me in inch-pounds?
Somfy publishes 440.1 inch-pounds for the 50 Nm rating on this motor. That figure carries heavy aluminum rolling shutter curtains and wide awning fabrics on a 2.5 inch tube. Calculate your own load from curtain weight and tube radius, then leave headroom rather than sizing to the published ceiling.
The Somfy 550R2 CMO (1051014) ships as a bare motor. Add the crown and drive for your tube, a CMO bracket, and a crank assembly, and you have a complete drive. Our team can confirm the crown profile against your tube measurement before you order.
Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
