What supply voltage and frequency does each use?

Rated voltage — Somfy 540R2 RTS CMO: 120 V; Somfy 540R2 40/14 SJTW: 120 V. Mains frequency — Somfy 540R2 RTS CMO: 60 Hz; Somfy 540R2 40/14 SJTW: 60 Hz. Power supply type — Somfy 540R2 RTS CMO: AC mains; Somfy 540R2 40/14 SJTW: AC mains.

What torque and speed is each rated for?

Rated torque — Somfy 540R2 RTS CMO: 40 Nm; Somfy 540R2 40/14 SJTW: 40 Nm. Rated speed — Somfy 540R2 RTS CMO: 14 rpm; Somfy 540R2 40/14 SJTW: 14 rpm.

What certifications are on record for each?

Marks stated by vendor — Somfy 540R2 RTS CMO: UL.

Which durability indicators does each publish?

OpenAxia does not rate reliability; the published indicators are: Short-time duty (S2) — Somfy 540R2 40/14 SJTW: 5 min. IP rating — Somfy 540R2 RTS CMO: IP44; Somfy 540R2 40/14 SJTW: IP44.

Somfy 540R2: RTS CMO vs 40/14 SJTW Compared

Cable length — Somfy 540R2 RTS CMO: 1.8 m^{[1; 2026-10-07]}; Somfy 540R2 40/14 SJTW: 2 m^{[2; 2026-10-07]}.

Operating temp. (max) — Somfy 540R2 RTS CMO: 40 °C^{[1; 2026-10-07]}; Somfy 540R2 40/14 SJTW: 60 °C^{[2; 2026-10-07]}.

Last verified: 2026-10-07

When to choose Somfy 540R2 RTS CMO

For 120 V^{[1; 2026-10-07]} / 60 Hz^{[1; 2026-10-07]} mains.
For the stated supply type: AC mains^{[1; 2026-10-07]}.
For a rated torque of 40 Nm^{[1; 2026-10-07]}.
For a rated speed of 14 rpm^{[1; 2026-10-07]}.

When to choose Somfy 540R2 40/14 SJTW

For 120 V^{[2; 2026-10-07]} / 60 Hz^{[2; 2026-10-07]} mains.
For the stated supply type: AC mains^{[2; 2026-10-07]}.
For a rated torque of 40 Nm^{[2; 2026-10-07]}.
For a rated speed of 14 rpm^{[2; 2026-10-07]}.

Verifiable indicators

Short-time duty (S2) — Somfy 540R2 40/14 SJTW: 5 min^{[2; 2026-10-07]}. Somfy 540R2 RTS CMO: Not published.

Rated life — Somfy 540R2 RTS CMO: Not published. Somfy 540R2 40/14 SJTW: Not published.

Thermal protection — Somfy 540R2 RTS CMO: Not published. Somfy 540R2 40/14 SJTW: Not published.

IP rating — Somfy 540R2 RTS CMO: IP44^{[1; 2026-10-07]}; Somfy 540R2 40/14 SJTW: IP44^{[2; 2026-10-07]}.

Comparison table
Property	Somfy 540R2 RTS CMOSomfy1051477	Somfy 540R2 40/14 SJTWSomfy1049894
Series & variant axes
Series	LT50	LT50
Control protocol	RTS (from model name)	—
Power supply	AC mains	AC mains
Torque	40 Nm	40 Nm
Electrical
Rated voltage	120 V^{[1; 2026-10-07]}	120 V^{[2; 2026-10-07]}
Mains frequency	60 Hz^{[1; 2026-10-07]}	60 Hz^{[2; 2026-10-07]}
Power supply type	AC mains^{[1; 2026-10-07]}	AC mains^{[2; 2026-10-07]}
Rated power input	210 W^{[3; 2026-09-30]}	210 W^{[3; 2026-09-30]}
Standby power	0 W^{[3; 2026-10-01]}	0 W^{[3; 2026-10-01]}
Rated current	1.8 A^{[1; 2026-10-07]}	1.8 A^{[2; 2026-10-07]}
Cable lengthDiffers: 1.8 m^{[1; 2026-10-07]} vs 2 m^{[2; 2026-10-07]}	1.8 m^{[1; 2026-10-07]}	2 m^{[2; 2026-10-07]}
Drive performance
Rated torque	40 Nm^{[1; 2026-10-07]}	40 Nm^{[2; 2026-10-07]}
Rated speed	14 rpm^{[1; 2026-10-07]}	14 rpm^{[2; 2026-10-07]}
Short-time duty (S2)	Not published	5 min^{[2; 2026-10-07]}
Limits & protection
Limit setting	Electronic^{[1; 2026-10-07]}	Not published
Limit range	34 turns^{[1; 2026-10-07]}	Not published
Control & communication
Control protocol	RTS^{[3; 2026-09-30]}	Not published
Radio frequency	433.42 MHz^{[3; 2026-10-01]}	Not published
Radio range	200 m^{[3; 2026-10-01]}	Not published
Max paired transmitters	12 pcs^{[3; 2026-10-01]}	Not published
Environment & protection
IP rating	IP44^{[1; 2026-10-07]}	IP44^{[2; 2026-10-07]}
Operating temp. (min)	-10 °C^{[1; 2026-10-07]}	-10 °C^{[2; 2026-10-07]}
Operating temp. (max)Differs: 40 °C^{[1; 2026-10-07]} vs 60 °C^{[2; 2026-10-07]}	40 °C^{[1; 2026-10-07]}	60 °C^{[2; 2026-10-07]}Highest stated
Noise level	Not published	55 dB(A)^{[3; 2026-09-30]}
Compliance & declarations
Marks stated by vendor	UL^{[3; 2026-10-01]}	Not published
View all 24 variants
Documents	Official datasheet ↗	Official datasheet ↗

— means no value: the manufacturer does not publish it, it does not apply to this product type, or there is none on record. Value states

Questions and answers

What supply voltage and frequency does each use?: Rated voltage — Somfy 540R2 RTS CMO: 120 V; Somfy 540R2 40/14 SJTW: 120 V. Mains frequency — Somfy 540R2 RTS CMO: 60 Hz; Somfy 540R2 40/14 SJTW: 60 Hz. Power supply type — Somfy 540R2 RTS CMO: AC mains; Somfy 540R2 40/14 SJTW: AC mains.
What torque and speed is each rated for?: Rated torque — Somfy 540R2 RTS CMO: 40 Nm; Somfy 540R2 40/14 SJTW: 40 Nm. Rated speed — Somfy 540R2 RTS CMO: 14 rpm; Somfy 540R2 40/14 SJTW: 14 rpm.
What certifications are on record for each?: Marks stated by vendor — Somfy 540R2 RTS CMO: UL.
Which durability indicators does each publish?: OpenAxia does not rate reliability; the published indicators are: Short-time duty (S2) — Somfy 540R2 40/14 SJTW: 5 min. IP rating — Somfy 540R2 RTS CMO: IP44; Somfy 540R2 40/14 SJTW: IP44.

Sources

↑Somfy PDF catalogueservice.somfy.comRated voltage: Voltage Supply: 120V AC, 60Hz [1049013] (p. 1)Manufacturer-stated · Observed 2026-10-07 · Retrieved 2026-10-06 · Public web pageUsed for: 51185, 51187, 51186, 51195, 51193, 51194, 51196, 51191, 51192, 51190, 51188, 51189
↑Somfy PDF catalogue lt50ra-d0025service.somfy.comRated voltage: Voltage Supply: 120V AC, 60Hz [1049042] (p. 1)Manufacturer-stated · Observed 2026-10-07 · Retrieved 2026-10-06 · Public web pageUsed for: 51140, 51142, 51141, 51148, 51146, 51147, 51149, 51150, 51143, 51144, 51145
↑Somfy Systems (North America) manufacturer site (product catalog)somfysystems.comRated power input: Consumption during operation 210 WManufacturer-stated · Observed 2026-09-30 · Retrieved 2026-09-30 · Public web pageUsed for: 4797, 4871, 11116, 11183, 4799, 11113, 11115, 11114, 4869, 11117

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Somfy 540R2 RTS CMO vs Somfy 540R2 40/14 SJTW

When to choose Somfy 540R2 RTS CMO

When to choose Somfy 540R2 40/14 SJTW

Verifiable indicators

Questions and answers

Sources