Somfy 510R2 LT50 Rolling Shutter Motor Fit and Specs

Start with the tube inside diameter

Buyers who pick an LT50 motor on torque alone hit a wall at the tube. The Somfy 510R2 measures 1.77 in across the body, and Somfy publishes 1.85 in as the minimum inside diameter of the tube it will enter. A 2 in round steel roller takes it. A 60 mm octagonal or 2.5 in tube takes it once you add the matching crown and drive. Anything tighter leaves the motor sitting proud of the tube end, and the drive never engages.

Torque comes second. The 510R2 delivers 10 Nm, 88 in-lb, at 14 rpm. That puts it in the middle of the LT50 range, sized for a rolling shutter where the slat curtain carries real weight and the run stays moderate.

The closures this motor suits

Somfy builds the LT50 platform for exterior work, and the 510R2 sits inside that line as a wired 120V motor with mechanical limits. Rolling shutters are its home. Fabricators also run LT50 motors of this class on exterior closures with similar load and tube geometry.

Two things rule the 510R2 out of some jobs. It holds no radio receiver, so every command reaches it over wire. Its limits are mechanical, capped at 46 turns, so a very tall curtain on a small tube can exhaust the travel before it reaches the sill.

Verified specs for the 510R2

Somfy publishes the 510R2 as reference 1038172, product name 510R2 10/14 SJTW. Every figure below comes from Somfy's own catalog entry for that reference.

The 45 dB figure matters on a bedroom shutter. The 0 W standby draw matters on a facade carrying twenty motors, where parasitic load adds up across a panel.

Crowns, drives and the bracket

The star head sets the bracket. Order the Somfy LT50 Star Head Motor Bracket (9410651), which Somfy publishes as the LT50 universal motor bracket rated to 50 Nm. The LT50 Universal Bracket with Spring Clip (9420631) gives you a clip retention option where the pocket depth leaves no room for a bolt-through plate.

At the other end of the motor, the crown and drive carry the tube. Pick the pair that matches your tube profile:

• Octagonal LT50 60MM Crown/Drive Set (9012233) for a 60 mm octagonal shutter tube, which is the common European profile on rolling shutters built for LT50 motors.
• LT50 2.5" Crown (9707026) paired with a 2.5 in drive for a larger round tube.
• LT50 2" Hard Clip Drive (9206088) for a 2 in round steel tube, which is the tightest tube the 510R2 enters.
• Drive stops and screws where the drive needs positive retention against a long curtain.

Use LT50 class crowns and drives on this motor. Parts cut for the 60 mm LT60 platform will not seat on a 50 mm body.

Wiring the cable and setting the limits

The 510R2 leaves the factory with 9.84 ft of SJTW cable, four conductors, white, and Somfy publishes the cable as removable. That length reaches a header box on most installs without a splice. The four wires give you line, neutral, ground, and the second switched leg that reverses rotation.

Wire it to a momentary or maintained rocker, a key switch, or a relay output in a panel. One point governs every multi-motor panel: never tie two 510R2 motors to one switch leg without a relay or a group controller between them, since back-feeding one motor's windings through another cooks both. Somfy rates the motor at 0.7 A, so a 15 A branch carries a bank of them, and the relay contact rating decides the real limit.

Rapid adjustment is the reason installers reach for this version of the LT50. Two push buttons on the motor head set the upper and lower stops without a setting wand and without a laptop. You drive the curtain to the position you want, press the matching button, and the mechanical limit locks there.

Three habits keep that job short. Set limits with the curtain and the bottom bar installed, since fabric or slat weight shifts the stop by a few millimeters. Count your turns before you commit, because 46 turns is the ceiling. Re-check the upper limit after the first dozen cycles, since a new slat curtain settles into its guides.

Order the 510R2 and the parts around it

The Somfy 510R2 120V 4-Wire Motor (1038172) ships with its 9.84 ft SJTW lead and a 5-year Somfy warranty. Add the star head bracket (9410651) and the crown and drive set that matches your tube, and the motor assembly is complete before the shutter leaves the bench.

Shoppers sizing up or down inside the same platform have a full LT50 ladder to work with, from 6 Nm through 50 Nm, all sharing the same brackets, crowns and drives. Changing torque later costs you a motor, not a rebuild.

Frequently asked questions

What tube does the Somfy 510R2 fit?

Somfy publishes 1.85 in as the minimum inside tube diameter for the 510R2. The motor body runs 1.77 in with a 1.97 in head. A 2 in round steel tube accepts it, and 60 mm octagonal or 2.5 in tubes accept it once you add the matching LT50 crown and drive. Tighter tubes will not take the motor.

How many turns will the mechanical limits hold?

Somfy rates the 510R2 limit switch at 46 turns. That covers a tall rolling shutter on a 2 in tube in most cases. Count the turns your curtain needs before you order, because the mechanical limits cap travel and no adjustment adds capacity past 46 turns.

Does the 510R2 work with a Somfy RTS remote?

The 510R2 holds no radio receiver. Somfy supplies it as a 4-wire motor for wired wall switches and relay control. An external 120V receiver can drive a wired motor of this class, so match the receiver's motor load rating and wiring to the motor you receive before you order one.

What power does the 510R2 draw?

Somfy publishes 0.7 A and 80 W during operation, with 0 W on standby. The supply is 120V at 60 Hz, with a published range of 108V to 126V. Size the circuit and the relay contacts for the inrush of every motor on the leg, not for one motor at 80 W.

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