Somfy 540R2 120V 4-Wire Motor (1049894)
Somfy 540R2 120V 4-Wire Motor (1049894)
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Somfy LT50 540R2 120V 4-Wire Motor -- standard exterior tubular motor
The Somfy LT50 540R2 is a 120V AC standard 4-wire star head motor built for awnings and rolling shutters. It delivers 40Nm (354" lb) of torque at 14 rpm, wired for control from a switch or third-party relay rather than radio.
Benefits
- Standard 4-wire star head motor -- ideal for pre-construction wiring while walls are open
- Adjustable motorhead orientation installs in 6 different positions
- Detachable power cable at the motor head for quick replacement or length management
- Snap-on drive wheels for quick assembly; rapid push-button limit setting
- Eco-designed -- draws no power in standby mode
- 5-year Somfy warranty
Specifications
| Torque / Speed | 40 Nm (354 in-lb) / 14 rpm |
| Control | Standard 4-wire (wired switch or relay) |
| Power supply | 120V AC, 60Hz |
| Head type | Star head |
| Warranty | 5 years |
Compatible with: LT50 crown and drive sets, LT50 motor brackets
Official Somfy documentation
Sold by ShadeMotorsDirect -- an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
Common questions
What is the 540R2 4-wire motor used for?
Part 1049894 is a standard 120V LT50 tubular motor that Somfy lists for awnings and rolling shutters. It has no radio inside, so a wired switch or relay tells it when to raise and lower.
What torque and speed does it deliver?
Somfy rates the 540R2 at 40 Nm of torque and 14 rpm, with a 210 W draw while running and 0 W in standby. It fits tubes with an inside diameter of 1.85 in or larger and lists a noise level of 55 dB.
How is it powered and wired?
It runs on 120V/60Hz through a 4-conductor SJTW cable that connects to a Somfy wall switch or relay. Somfy rates the motor IP 44. Run the control wire to the switch location while the walls are open.
How are the limits set?
Somfy lists mechanical limit switches with a capacity of 46 turns. You set the upper and lower stops at the motor head, so confirm your awning or shutter travel falls within that turn count before you order.
Which wall switches work with it?
Somfy 120V maintained switches wire to it, such as the Maintained Toggle Switch (1800380) or the Maintained Rocker Switch Kit (1800342). Each one holds its position until you flip it again, and it mounts in a standard electrical box.
Can I add remote or app control later?
Yes. The Somfy Universal RTS Receiver for 110V AC motors (1810627) adds RTS remote and sensor control, and a TaHoma Switch (1871037) then brings app and voice control. For radio built into the motor, the Altus RTS 540R2 (1240556) shares the 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 120V 4-Wire Motor (1049894)
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Somfy 540R2 Altus RTS 120V 3-Wire Motor (1240556)
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Somfy 550R2 120V 4-Wire Motor (1051464)
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|---|---|---|---|---|
| Price | ||||
| Torque (Nm) | 40.0 | 40.0 | 35.0 | 50.0 |
| Speed (rpm) | 14 | 14 | 20 | 14 |
| Control | Wired 4-wire | RTS radio | Wired 4-wire | Wired 4-wire |
| 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, RTS radio control | 35.0 Nm instead of 40.0 | 50.0 Nm instead of 40.0 |
| Buy | Currently viewing | View details | View details | View details |
