Somfy 515A2 15 Nm LT50 Wired Motor Fit and Torque Guide

Tube diameter sets the first limit on this motor

Installers reach for the Somfy 515A2 when an awning or a rolling shutter needs 15 Nm of torque and runs on wire instead of radio. The motor body measures 1.77 in across and the head steps up to 1.97 in. The tube needs an inside diameter of 1.85 in or more for the motor to seat and turn free. Measure the tube before you order. A 2 in nominal round tube clears this motor. A narrower profile will bind on the body.

Somfy publishes the reference as 515A2 15/20 SJTW 10FT UNIT, ref 1040063. That name carries the platform size, the torque, the speed and the cable type, so the carton tells you the motor mates with the LT50 family of crowns, drives and brackets.

Awnings and rolling shutters this motor drives

The 515A2 works outside. Lateral arm awnings, cassette awnings, rolling shutters and exterior screens sit inside its range at 15 Nm, which Somfy also prints as 132 in-lb. The 20 rpm output moves a shutter curtain at a brisk pace and still gives the end caps an easy ride. Somfy rates five minutes of continuous run before the thermal cutout steps in, and a full travel on a tall shutter finishes well inside that window.

Control comes over four wires. A wall switch, a dry contact relay or an automation output drives the motor. Builders specify this version during pre-construction, while the walls stand open and a cable run to a switch box adds nothing to the labor. Crews working a finished opening pick the radio versions of the LT50 platform instead, since those carry the receiver inside the motor.

Verified specifications for ref 1040063

Somfy publishes every figure above for ref 1040063 in its professional catalog.

Crowns, drives and the bracket that carry the load

A tubular motor idles inside the tube on a crown and passes torque out through a drive wheel. Somfy builds matched sets for each tube profile, and the set has to suit the tube you own rather than the motor. For a 2.5 in round tube, the Somfy LT50 2.5" Round Crown and Drive Set (9012231) snaps on at the bench with no tools. For a 70 mm octagonal shutter tube, the Somfy Octagonal LT50 70mm Crown and Drive Set (9012234) keys into the flats and holds the curtain square through the whole travel.

At the head, the Somfy LT50 Star Head Motor Bracket (9410651) locates the star and carries the reaction torque into the structure. The head orients in six positions, so the cable leaves the box up, down or to either side once the fascia closes. Use LT50 class crowns, drives and brackets on this motor. LS40 parts will not seat on a 1.77 in body.

Wiring, power and the control side

Somfy ships the 515A2 with 9.84 ft of white 4-wire SJTW cable, and that cable detaches at the head. A damaged lead comes off without pulling the motor out of the tube, which saves a service call on a high awning. The motor pulls 1.1 A and 130 W while it turns and nothing at rest, so a bank of shutters costs nothing to leave idle.

Class I insulation calls for a ground conductor. Land the green lead on the box ground. Two travel conductors and a neutral finish the connection, and the switch interrupts one travel leg at a time. Never energize both travel wires together. A standard momentary or maintained rocker runs a single motor, and a relay module runs a group from one input.

Supply range spans 108 V to 126 V. A long branch circuit with some voltage sag at the far end stays inside that band, which matters on commercial runs where the panel sits a hundred feet from the last shutter.

Setting limits and the first travel

The 515A2 uses a mechanical limit switch unit with 46 turns of capacity. Push-button adjusters on the head set the upper and lower stops. Run the curtain to the position you want, hold the matching button, and the motor records the stop. Somfy rates repeatability at plus or minus 5, so a shutter drops to the same guide position in January and in July.

Thermal protection trips at 284 F and resets on its own after the motor cools. Mount the head inside the box and out of direct sun to keep the duty cycle honest. The IP 44 rating covers splash and spray from any direction. It does not cover immersion, so keep the cable gland above any water that collects in the headbox.

Order the 515A2 and the parts around it

The Somfy 515A2 120V 4-Wire Motor (1040063) ships with the detachable SJTW lead and the push-button limit head. Pair it with the crown and drive set that matches your tube, add the star head bracket, and the mechanical side of the install is done. Somfy backs the motor for five years.

What tube does the Somfy 515A2 fit?

Somfy publishes a minimum tube inside diameter of 1.85 in for this motor. The body measures 1.77 in and the head 1.97 in. A 2 in nominal round tube or a 70 mm octagonal shutter tube both accept it with the matching LT50 crown and drive set. Measure the actual inside diameter, since wall thickness varies by supplier.

How do you set the limits on a 515A2?

The motor carries a mechanical limit switch unit on the head with two push-button adjusters and 46 turns of capacity. Drive the curtain to the upper stop, hold the matching button until the motor records it, then repeat at the lower stop. No remote or programming tool enters the process, since the adjustment sits on the motor itself.

Can the 515A2 run from a Somfy RTS remote?

The 515A2 takes wired control over four conductors and carries no radio receiver. Somfy builds RTS versions across the LT50 platform for radio projects, and those motors hold the receiver inside the tube. Pick the wired 515A2 for switch control or relay control, and pick an RTS motor when the project calls for handheld operation.

Which bracket suits the star head on this motor?

The LT50 Star Head Motor Bracket (9410651) matches the star geometry on ref 1040063 and takes the reaction torque into the structure. It holds the head in any of six orientations, which gives the cable a clean exit path. Match the bracket class to the motor class and the install lines up on the first fit.

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