What supply voltage and frequency does each use?

Rated voltage — Somfy 520R2 20/14 SJTW: 120 V; Somfy 515S2 RS485: 120 V. Mains frequency — Somfy 520R2 20/14 SJTW: 60 Hz; Somfy 515S2 RS485: 60 Hz. Power supply type — Somfy 520R2 20/14 SJTW: AC mains; Somfy 515S2 RS485: AC mains.

What torque and speed is each rated for?

Rated torque — Somfy 520R2 20/14 SJTW: 20 Nm; Somfy 515S2 RS485: 15 Nm. Rated speed — Somfy 520R2 20/14 SJTW: 14 rpm.

Which durability indicators does each publish?

OpenAxia does not rate reliability; the published indicators are: Short-time duty (S2) — Somfy 520R2 20/14 SJTW: 5 min; Somfy 515S2 RS485: 4 min. IP rating — Somfy 520R2 20/14 SJTW: IP44; Somfy 515S2 RS485: IP44.

Somfy 520R2 20/14 SJTW vs Somfy 515S2 RS485: Specs Compared

Rated power input — Somfy 520R2 20/14 SJTW: 130 W^{[3; 2026-09-30]}; Somfy 515S2 RS485: 210 W^{[3; 2026-09-30]}.

Rated current — Somfy 520R2 20/14 SJTW: 1.1 A^{[1; 2026-10-07]}; Somfy 515S2 RS485: 1.8 A^{[2; 2026-10-06]}.

Standby power — Somfy 520R2 20/14 SJTW: 0 W^{[3; 2026-10-01]}; Somfy 515S2 RS485: 0.5 W^{[3; 2026-10-01]}.

Last verified: 2026-10-07

When to choose Somfy 520R2 20/14 SJTW

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 20 Nm^{[1; 2026-10-07]}.
For a rated speed of 14 rpm^{[1; 2026-10-07]}.

When to choose Somfy 515S2 RS485

For 120 V^{[2; 2026-10-06]} / 60 Hz^{[2; 2026-10-06]} mains.
For the stated supply type: AC mains^{[2; 2026-10-06]}.
For a rated torque of 15 Nm^{[2; 2026-10-06]}.
For the stated control protocol: RS-485^{[3; 2026-09-30]}.

Verifiable indicators

Short-time duty (S2) — Somfy 520R2 20/14 SJTW: 5 min^{[1; 2026-10-07]}; Somfy 515S2 RS485: 4 min^{[2; 2026-10-06]}.

Rated life — Somfy 520R2 20/14 SJTW: Not published. Somfy 515S2 RS485: Not published.

Thermal protection — Somfy 520R2 20/14 SJTW: Not published. Somfy 515S2 RS485: Not published.

IP rating — Somfy 520R2 20/14 SJTW: IP44^{[1; 2026-10-07]}; Somfy 515S2 RS485: IP44^{[2; 2026-10-06]}.

Comparison table
Property	Somfy 520R2 20/14 SJTWSomfy1042055	Somfy 515S2 RS485Somfy1002427
Series & variant axes
Series	LT50	LT50
Control protocol	—	RS-485 (from model name)
Power supply	AC mains	AC mains
TorqueDiffers: 20 Nm vs 15 Nm	20 Nm	15 Nm
Electrical
Rated voltage	120 V^{[1; 2026-10-07]}	120 V^{[2; 2026-10-06]}
Mains frequency	60 Hz^{[1; 2026-10-07]}	60 Hz^{[2; 2026-10-06]}
Power supply type	AC mains^{[1; 2026-10-07]}	AC mains^{[2; 2026-10-06]}
Rated power inputDiffers: 130 W^{[3; 2026-09-30]} vs 210 W^{[3; 2026-09-30]}	130 W^{[3; 2026-09-30]}	210 W^{[3; 2026-09-30]}
Standby powerDiffers: 0 W^{[3; 2026-10-01]} vs 0.5 W^{[3; 2026-10-01]}	0 W^{[3; 2026-10-01]}Lowest stated	0.5 W^{[3; 2026-10-01]}
Rated currentDiffers: 1.1 A^{[1; 2026-10-07]} vs 1.8 A^{[2; 2026-10-06]}	1.1 A^{[1; 2026-10-07]}	1.8 A^{[2; 2026-10-06]}
Cable lengthDiffers: 2 m^{[1; 2026-10-07]} vs 3 m^{[2; 2026-10-06]}	2 m^{[1; 2026-10-07]}	3 m^{[2; 2026-10-06]}
Drive performance
Rated torqueDiffers: 20 Nm^{[1; 2026-10-07]} vs 15 Nm^{[2; 2026-10-06]}	20 Nm^{[1; 2026-10-07]}	15 Nm^{[2; 2026-10-06]}
Rated speed	14 rpm^{[1; 2026-10-07]}	Not published
Short-time duty (S2)Differs: 5 min^{[1; 2026-10-07]} vs 4 min^{[2; 2026-10-06]}	5 min^{[1; 2026-10-07]}Highest stated	4 min^{[2; 2026-10-06]}
Limits & protection
Limit setting	Not published	Electronic^{[2; 2026-10-06]}
Limit range	Not published	300 turns^{[2; 2026-10-06]}
Control & communication
Control protocol	Not published	RS-485^{[3; 2026-09-30]}
Environment & protection
IP rating	IP44^{[1; 2026-10-07]}	IP44^{[2; 2026-10-06]}
Operating temp. (min)Differs: -10 °C^{[1; 2026-10-07]} vs -20 °C^{[2; 2026-10-06]}	-10 °C^{[1; 2026-10-07]}	-20 °C^{[2; 2026-10-06]}Lowest stated
Operating temp. (max)	60 °C^{[1; 2026-10-07]}	60 °C^{[2; 2026-10-06]}
Noise levelDiffers: 48 dB(A)^{[3; 2026-09-30]} vs 55 dB(A)^{[2; 2026-10-06]}	48 dB(A)^{[3; 2026-09-30]}Lowest stated	55 dB(A)^{[2; 2026-10-06]}
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

Same-series variants

Variant axis	Somfy 520R2 20/14 SJTW	Somfy 515S2 RS485
Torque	20 Nm^{[Somfy PDF catalogue lt50ra-d0025.pdf; 2026-10-07]}	15 Nm^{[Somfy PDF catalogue lt50rs485-d0034.pdf; 2026-10-06]}

Questions and answers

What supply voltage and frequency does each use?: Rated voltage — Somfy 520R2 20/14 SJTW: 120 V; Somfy 515S2 RS485: 120 V. Mains frequency — Somfy 520R2 20/14 SJTW: 60 Hz; Somfy 515S2 RS485: 60 Hz. Power supply type — Somfy 520R2 20/14 SJTW: AC mains; Somfy 515S2 RS485: AC mains.
What torque and speed is each rated for?: Rated torque — Somfy 520R2 20/14 SJTW: 20 Nm; Somfy 515S2 RS485: 15 Nm. Rated speed — Somfy 520R2 20/14 SJTW: 14 rpm.
Which durability indicators does each publish?: OpenAxia does not rate reliability; the published indicators are: Short-time duty (S2) — Somfy 520R2 20/14 SJTW: 5 min; Somfy 515S2 RS485: 4 min. IP rating — Somfy 520R2 20/14 SJTW: IP44; Somfy 515S2 RS485: IP44.

Sources

↑Somfy PDF catalogue lt50ra-d0025service.somfy.comRated voltage: Voltage Supply: 120V AC, 60Hz [1041026] (p. 1)Manufacturer-stated · Observed 2026-10-07 · Retrieved 2026-10-06 · Public web pageUsed for: 51151, 51153, 51152, 51159, 51157, 51158, 51160, 51161, 51154, 51155, 51156
↑Somfy PDF catalogue lt50rs485-d0034service.somfy.comRated voltage: Voltage Supply: 120V AC, 60Hz [1002427] (p. 1)Manufacturer-stated · Observed 2026-10-06 · Retrieved 2026-10-06 · Public web pageUsed for: 50298, 50300, 50299, 50308, 50306, 50307, 50309, 50302, 50303, 50301, 50304, 50305, 50310
↑Somfy Systems (North America) manufacturer site (product catalog)somfysystems.comRated power input: Consumption during operation 130 WManufacturer-stated · Observed 2026-09-30 · Retrieved 2026-09-30 · Public web pageUsed for: 4247, 4429, 10458, 10527, 4431, 4245

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