Somfy Sonesse 40 Zigbee 404S2 Motor Fit and Specs Guide

Measure the inside of the tube before you order anything else. Somfy publishes a 1.46 in minimum inner tube diameter for the Sonesse 40 Zigbee 404S2, and that single figure settles more orders than torque does. The motor carries 4 Nm at 36 rpm on 120V line power, and it joins a Zigbee 3.0 mesh rather than taking a control wire back to a switch.

Measure the tube before you order

Measure the inner diameter at both ends of the tube, since a crimped end will read smaller than the middle. A 40 mm octagonal or round tube accepts this motor with the matching crown and drive set. Narrow decorative tube will not take it.

Somfy supplies a 1.64 ft SVT pigtail that ends in the Fast Connector. The power run meets the motor at a plug instead of a wire nut, which shortens the time an electrician spends inside a finished headbox. Confirm the connector style against the motor you receive before you order the mating half.

Shades the 404S2 drives

Interior roller shades form the core application for this reference. Somfy also rates it for projection screens, which matters in conference rooms and home theaters where a 36 rpm travel keeps a screen drop short. The 404S2 sits at the entry torque of the Sonesse 40 line. Light and medium interior fabric on a standard opening suits it well.

Heavier blackout cloth on a wide window pushes the specification up. Installers facing that load step to the 406A2 at 6 Nm or the 409R2 at 9 Nm on the same platform and the same tube hardware. Noise stays low across the range. Somfy rates the 404S2 at 42 dB, which holds it under the level of ordinary conversation in a quiet office.

Verified specifications

Figures come from Somfy's published reference data for 1245920.

Crowns, drives, and brackets that fit

The motor reaches the tube through a crown and drive set cut for that tube profile. Round 40 mm tube takes the Somfy LS40 Crown and Drive Set (9012224). Octagonal tube takes the Somfy LS40 Octagonal Rubberized Crown and Drive Set (9016655), where the rubber face grips the flats and damps some of the drive noise that a bare crown passes into the tube.

Shops cutting tube to length order the Somfy 40mm Octagonal Tube (1781154) by the foot in 20 ft increments. Mounting comes next, and the Somfy RollEase 2 inch SkyLine Universal Motor Bracket and Idler Bracket (9016325) carries the motor head and the idler end as a matched pair at a 2 in projection.

Order 40 mm hardware for this motor. Crowns and drives cut for 28 mm or 30 mm tube will not seat on the drive wheel, and an adaptor does not bridge that gap.

Zigbee control and the TaHoma path

Zigbee 3.0 runs a mesh network at 2.450 GHz. Each motor relays for its neighbors, so a line of shades down a long corridor extends radio coverage as you add units. A single weak link stops being the whole story. The motor reports its position back to the network, so an app shows where a shade sits instead of guessing from the last command sent.

A Somfy TaHoma switch acts as the coordinator for the mesh and brings the shades into the phone app, into scenes, and into time and sun schedules. Voice platforms reach the shades through that hub. Pair each motor to the hub before you commission limits if you plan to drive the shade from the app during setup.

Wiring and limit setup

The 404S2 takes line voltage at 120V, 60 Hz through the Fast Connector pigtail. An electrician brings the circuit to the headbox and lands the mating connector there. Somfy rates the motor Class II for insulation and IP 31 for ingress, which keeps it on the interior side of the glass. Exterior solar screens and awnings belong on the Altus and Maestria lines instead.

Limits run electronic with a 250 turn capacity. Set the upper and lower stop points once and the motor holds them through a power cycle. Thermal protection trips after 4 min of continuous operation, so spread long commissioning cycles across several shades rather than driving one up and down until it rests. Keep the ambient temperature between 32 and 140 F in service.

The Somfy Sonesse 40 404S2 Zigbee 3.0 Motor (1245920) ships with the round head in white, and Somfy backs it for 5 years. Pair it with the crown and drive set your tube profile calls for and the bracket pair that matches your headbox projection.

Frequently asked questions

What tube does the Sonesse 40 Zigbee 404S2 fit?

Somfy publishes a 1.46 in minimum inner tube diameter for reference 1245920. A 40 mm round or octagonal roller tube takes the motor with the matching LS40 crown and drive set. Measure the inner diameter at both ends of the tube, because a crimped or swaged end reads smaller than the middle and decides the fit.

Does this motor need a TaHoma hub?

Zigbee motors reach an app, scenes, and schedules through a coordinator, and the Somfy TaHoma switch fills that role. The hub also opens the path to voice platforms and to position feedback from each shade. Local control without a hub depends on the devices you pair, so plan the coordinator into the job from the start.

How much shade can 4 Nm lift?

4 Nm at 36 rpm covers light and medium interior fabric on a standard window opening. Fabric weight, tube diameter, and finished drop all feed the calculation, so run the numbers for your assembly. Heavier blackout cloth on a wide opening points to the 406A2 at 6 Nm or the 409R2 at 9 Nm on the same tube platform.

Can this motor go in an exterior screen?

Somfy rates reference 1245920 IP 31 and Class II, and lists it for interior blinds, shades, and projection screens. Exterior applications call for a motor built for weather exposure, such as the Altus RTS or Maestria lines on the LT50 platform. Keep the 404S2 inside the building envelope.

Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.