Low-voltage interior projects put two demands on a 50mm motor. It has to seat in the tube the fabricator already cut, and it has to answer a controller over a data bus rather than a wall switch. Somfy builds the Sonesse ULTRA 504 A8 DC RS485, reference 1134022, for that pair. Somfy rates it at 4 Nm and 25 rpm, powers it from 24V DC, and finishes it with a square head.
A 50mm motor built for low-voltage runs
The Sonesse ULTRA family sits at the quiet end of Somfy's 50mm lineup, and this reference occupies its 24V DC corner. Somfy publishes 35 dB for the motor. That figure matters in a bedroom, a boardroom, or a screening room, where a shade cycling at nine in the morning should not pull anyone's attention off the room.
The 504 A8 designation carries the rating. Somfy publishes 4 Nm of torque at 25 rpm, drawing 1.5 A and 36 W while the shade travels. Standby draw settles at 0.48 W. Insulation is Class III, which follows from the low-voltage supply, and the enclosure carries an IP 20 rating for interior use. Somfy's supply window runs 22.8 V to 25.2 V, so a power panel with sagging output on a long home run will push the motor out of spec before the fabric ever binds.
Shades this motor drives
Somfy lists two applications for reference 1134022: interior window coverings and projection screens. Both lean on the same qualities. A projection screen asks for a motor that stops on a repeatable mark and makes little noise doing it, and a 35 dB motor with electronic limits gives an integrator that.
Torque alone never decides a shade. Tube diameter, fabric weight, hem bar mass, and finished width all feed the calculation, and Somfy publishes the load tables in the 500 Series Databook rather than on the product page. Treat 4 Nm as the input to that table. Fabricators running a 96 inch commercial roller in a 2 inch tube check the width against the databook column for the tube they are using, not against the torque figure by itself.
Verified specifications
| Reference | 1134022 |
| Official name | Sonesse ULTRA 504 A8 DC RS485 |
| Torque | 4 Nm (35 in-lb) |
| Speed | 25 rpm |
| Control | RS485, Somfy Digital Network |
| Power supply | 24V DC, 22.8 V to 25.2 V |
| Rated current | 1.5 A |
| Power in operation | 36 W |
| Standby power | 0.48 W |
| Noise level | 35 dB |
| Protection rating | IP 20 |
| Insulation class | Class III |
| Head type | Square |
| Minimum tube inner diameter | 1.85 in |
| Motor length | 31.5 in |
| Limit type | Electronic, 250 turn capacity |
| Limit repeatability | +/- 5 |
| Cable | 2-conductor, fast connector ends, 0.66 ft, white |
| Operating temperature | 32 to 140 F |
| Storage temperature | -4 to 176 F |
| Thermal protection | 4 min |
| Weight | 5.51 lb |
| Approval | UR |
| Warranty | 5 years |
Figures come from Somfy's published record for reference 1134022 on somfypro.com and somfysystems.com.
Tube, drive and bracket fit
Somfy publishes a 1.85 in minimum inner tube diameter for this motor. A 2 inch tube clears that; anything tighter does not. The motor measures 31.5 in end to end, which sets the headbox length a fabricator has to leave beside the idler and the tube cut.
The head is square, and that single fact rules the bracket choice. A star bracket will not hold it. Pair the motor with the Somfy Motor Bracket with Spring Ring, Square 120mm (9763503), which captures the square head and the spring ring together.
On the drive end, the LT50 2 inch Soft Clip Drive (9206089) matches a 2 inch tube. Fabricators working 2.5 inch tube move to the 2.5 inch soft clip drive instead. Soft clip drives snap onto the motor crown and take the tube without a set screw, which shortens assembly on a run of twenty shades.
Power and data on one pigtail
Somfy ships the motor with a short 0.66 ft lead ending in a fast connector, so the run back to the panel happens on a separate cable. That cable is the Sonesse ULTRA 50 DC RS485 Data and Power Pigtail (9020004). It carries the 24V supply and the RS485 pair to the same head, which keeps one connector at the motor end of every shade in a bank.
SDN runs as a bus. Motors chain off a low-voltage power and data backbone, each one answering on its own address, and a controller or an animeo IP head end drives the whole bank. Two-way communication means the head end reads position back from the motor rather than guessing at it from elapsed run time. Confirm the connector on the motor you receive against the pigtail before you pull cable, since Somfy has shipped more than one lead configuration across the ULTRA 50 line.
Commissioning and limits
Limits on this motor are electronic, with a 250 turn capacity and +/- 5 repeatability. An installer sets them with the Somfy RS485 Setting Tool (9017142), which also reads back the address Somfy assigned at the factory. That address matters on a bus with thirty motors on it, since a duplicate stops the whole segment from behaving.
Commissioning from a laptop takes the USB to RS485 adaptor for SDN instead, which puts Somfy's configuration software on the bus. Either path gets you to the same place. Thermal protection cuts in after 4 minutes of continuous run, which no interior shade should ever reach in normal service.
Operating range runs 32 to 140 F, and storage tolerates -4 to 176 F. Somfy backs the motor for 5 years.
Frequently asked questions
What tube does the Sonesse ULTRA 504 A8 DC RS485 fit?
Somfy publishes a minimum inner tube diameter of 1.85 in for reference 1134022. A 2 inch tube clears it with room for the drive wheel. Pair the motor with an LT50 soft clip drive sized to the tube you are running, and leave 31.5 in of headbox for the motor body beside the idler end.
How does this motor differ from the RTS version?
This reference communicates over RS485 on the Somfy Digital Network, so a controller or an animeo IP head end drives it and reads position back. The RTS version of the 504 A8 carries a radio receiver and answers a Somfy remote. Both share the 4 Nm rating, the 25 rpm speed and the square head.
Which bracket holds a square head?
A square spring-ring bracket such as the Somfy Motor Bracket with Spring Ring, Square 120mm (9763503). Star brackets and CMO brackets will not seat this head. Check the head shape before ordering hardware, since Somfy builds the ULTRA 50 line in more than one head configuration.
Does the motor need a separate power supply?
Yes. The motor runs on 24V DC within a 22.8 to 25.2 V window and draws 1.5 A in operation. An SDN power panel feeds the bus, and the Sonesse ULTRA 50 DC RS485 pigtail (9020004) carries supply and data to the motor head on one cable.
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