Somfy 540R2 Altus RTS 120V 3-Wire Motor (1240556)
Somfy 540R2 Altus RTS 120V 3-Wire Motor (1240556)
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Somfy LT50 540R2 Altus RTS Motor -- wireless exterior tubular motor
The Somfy LT50 540R2 Altus RTS is a wireless, radio-controlled exterior motor delivering 40Nm (354" lb) at 14 rpm for solar screens, awnings, and rolling shutters -- no control wiring required, just an RTS remote or wall switch.
Benefits
- Radio Technology Somfy (RTS) -- no control wiring back to the motor required
- Pairs with Situo/Telis handheld remotes and DecoFlex wall switches
- Standard star-head LT50 mounting hardware
- 5-year Somfy warranty
Specifications
| Torque / Speed | 40 Nm (354 in-lb) / 14 rpm |
| Control | RTS (433.42 MHz radio) |
| Power supply | 120V AC, 60Hz |
| Head type | Star head |
| Warranty | 5 years |
Compatible with: LT50 crown and drive sets, LT50 motor brackets, Situo/Telis RTS remotes, RTS wall switches
Official Somfy documentation
Sold by ShadeMotorsDirect -- an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
Common questions
What is the Altus RTS 540R2 used for?
Part 1240556 is a 120V LT50 tubular motor with a built-in RTS radio receiver. Somfy lists awnings, rolling shutters, exterior solar screens, interior shades, projection screens and retractable insect screens among its applications.
What torque and speed does it deliver?
Somfy rates the Altus RTS 540R2 at 40 Nm of torque and 14 rpm. It draws 210 W while running and 0.37 W in standby, and it fits tubes with an inside diameter of 1.85 in or larger.
How is the motor powered and wired?
It runs on 120V/60Hz through a 3-conductor cable, and the radio inside the motor replaces control wiring. Bring power to the motor location, then pair a transmitter. Somfy rates the motor IP 44.
Which remotes and switches work with it?
Any Somfy RTS transmitter works, including the Situo 1 Channel RTS Pure Remote (1870571), Telis patio remotes and DecoFlex RTS wall switches. Somfy lists 12 channels for this motor and rates RTS range at 656.2 ft in open field.
Can it retract an awning when the wind picks up?
Yes. RTS wind sensors pair with this motor, such as the Eolis 3D WireFree RTS Wind Sensor (1816081), which also comes in black (1816082) and off-white (1816083). The sensor sends a retract command when the awning moves past the threshold you set.
Can I control it from my phone, or use wired switches instead?
Add a Somfy TaHoma Switch (1871037) for app and voice control. RTS is one-way radio, so the app cannot report position. For a wired switch setup, the 540R2 4-wire motor (1049894) carries the same 40 Nm and 14 rpm rating.
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How this motor compares
Verified Somfy specs for this motor and its closest alternatives.
| Specification | You're viewing
Somfy 540R2 Altus RTS 120V 3-Wire Motor (1240556)
| 
Somfy 540R2 120V 4-Wire Motor (1049894)
| 
Somfy 535A2 Altus RTS 120V 3-Wire Motor (1038168)
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Somfy Altus RTS 550R2 (1038170)
|
|---|---|---|---|---|
| Price | ||||
| Torque (Nm) | 40.0 | 40.0 | 35.0 | 50.0 |
| Speed (rpm) | 14 | 14 | 20 | 14 |
| Control | RTS radio | Wired 4-wire | RTS radio | RTS radio |
| Power | 120V AC | 120V AC | 120V AC | 120V AC |
| Motor family | LT50 | LT50 | LT50 | LT50 |
| What's different | The product on this page | Same size, Wired 4-wire control | 35.0 Nm instead of 40.0 | 50.0 Nm instead of 40.0 |
| Buy | Currently viewing | View details | View details | View details |
