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Last verified: 2026-10-07

Verifiable indicators

Short-time duty (S2) — Wistar motor WSM50 · 20 Nm · 33 rpm: 4 min^{[1; 2026-10-01]}; Somfy 515S2 15/38 RH SJTW: 5 min^{[2; 2026-10-07]}; Somfy 515S2 15/38 SJTW: 5 min^{[2; 2026-10-07]}.

Rated life — Wistar motor WSM50 · 20 Nm · 33 rpm: Not published. Somfy 515S2 15/38 RH SJTW: Not published. Somfy 515S2 15/38 SJTW: Not published.

Thermal protection — Wistar motor WSM50 · 20 Nm · 33 rpm: Not published. Somfy 515S2 15/38 RH SJTW: Not published. Somfy 515S2 15/38 SJTW: Not published.

IP rating — Wistar motor WSM50 · 20 Nm · 33 rpm: IP44^{[1; 2026-10-01]}; Somfy 515S2 15/38 RH SJTW: IP44^{[2; 2026-10-07]}; Somfy 515S2 15/38 SJTW: IP44^{[2; 2026-10-07]}.

Comparison table
Property	Wistar motor WSM50 · 20 Nm · 33 rpmWistar motorWSM50-20/33	Somfy 515S2 15/38 RH SJTWSomfy1040061	Somfy 515S2 15/38 SJTWSomfy1040062
Series & variant axes
SeriesDiffers: WSM50 vs LT50 vs LT50	WSM50	LT50	LT50
Power supply	—	AC mains	AC mains
Torque	—	15 Nm	15 Nm
Identity & lineage
Series / product line	WSM50^{[1; 2026-10-01]}	Not published	Not published
Electrical
Rated voltage	120 V^{[1; 2026-10-01]}	120 V^{[2; 2026-10-07]}	120 V^{[2; 2026-10-07]}
Mains frequency	60 Hz^{[1; 2026-10-01]}	60 Hz^{[2; 2026-10-07]}	60 Hz^{[2; 2026-10-07]}
Power supply type	AC mains^{[1; 2026-10-01]}	AC mains^{[2; 2026-10-07]}	AC mains^{[2; 2026-10-07]}
Rated power inputDiffers: 280 W^{[1; 2026-10-01]} vs 210 W^{[3; 2026-09-30]} vs 210 W^{[3; 2026-09-30]}	280 W^{[1; 2026-10-01]}	210 W^{[3; 2026-09-30]}	210 W^{[3; 2026-09-30]}
Standby power	Not published	0 W^{[3; 2026-10-01]}	0 W^{[3; 2026-10-01]}
Rated currentDiffers: 2.4 A^{[1; 2026-10-01]} vs Not published vs 1.8 A^{[2; 2026-10-07]}	2.4 A^{[1; 2026-10-01]}	Not published	1.8 A^{[2; 2026-10-07]}
Cable length	Not published	2 m^{[2; 2026-10-07]}	2 m^{[2; 2026-10-07]}
Drive performance
Rated torqueDiffers: 20 Nm^{[1; 2026-10-01]} vs 15 Nm^{[4; 2026-10-07]} vs 15 Nm^{[2; 2026-10-07]}	20 Nm^{[1; 2026-10-01]}	15 Nm^{[4; 2026-10-07]}	15 Nm^{[2; 2026-10-07]}
Rated speedDiffers: 33 rpm^{[1; 2026-10-01]} vs 38 rpm^{[4; 2026-10-07]} vs 38 rpm^{[2; 2026-10-07]}	33 rpm^{[1; 2026-10-01]}	38 rpm^{[4; 2026-10-07]}	38 rpm^{[2; 2026-10-07]}
Short-time duty (S2)Differs: 4 min^{[1; 2026-10-01]} vs 5 min^{[2; 2026-10-07]} vs 5 min^{[2; 2026-10-07]}	4 min^{[1; 2026-10-01]}	5 min^{[2; 2026-10-07]}Highest stated	5 min^{[2; 2026-10-07]}Highest stated
Dimensions & mounting
Motor diameter	45 mm^{[1; 2026-10-01]}	Not published	Not published
Overall length	630 mm^{[1; 2026-10-01]}	Not published	Not published
Weight	3 kg^{[1; 2026-10-01]}	Not published	Not published
Limits & protection
Limit setting	Mechanical^{[1; 2026-10-01]}	Not published	Not published
Limit range	27 turns^{[1; 2026-10-01]}	Not published	Not published
Environment & protection
IP rating	IP44^{[1; 2026-10-01]}	IP44^{[2; 2026-10-07]}	IP44^{[2; 2026-10-07]}
Operating temp. (min)	Not published	-10 °C^{[2; 2026-10-07]}	-10 °C^{[2; 2026-10-07]}
Operating temp. (max)	Not published	60 °C^{[2; 2026-10-07]}	60 °C^{[2; 2026-10-07]}
Noise levelDiffers: Not published vs 60 dB(A)^{[3; 2026-09-30]} vs 56 dB(A)^{[2; 2026-10-07]}	Not published	60 dB(A)^{[3; 2026-09-30]}	56 dB(A)^{[2; 2026-10-07]}Lowest stated
View all 24 variants
Documents	Request datasheet	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

Sources

↑Wistar motor manufacturer site (product catalog)wistarmotor.comSeries / product line: Ref: WSM50Manufacturer-stated · Observed 2026-10-01 · Retrieved 2026-10-01 · Public web pageUsed for: 15183, 15174, 15182, 15164, 15172, 15176, 15160, 15162, 15178, 15168, 15179, 15181, 15184, 15180, 15166
↑Somfy PDF catalogue lt50ra-d0025service.somfy.comRated voltage: Voltage Supply: 120V AC, 60Hz [1039019] (p. 1)Manufacturer-stated · Observed 2026-10-07 · Retrieved 2026-10-06 · Public web pageUsed for: 51120, 51128, 51122, 51130, 51121, 51129, 51136, 51126, 51134, 51135, 51137, 51127, 51138, 51123, 51131, 51124, 51132, 51125, 51133, 51139
↑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: 4496, 4502, 10543, 10544, 4494
↑Model-name rule somfy-explicit-torque-speed-v2: Somfy model names carrying an explicit "<Nm>/<rpm>" pair, e.g. "525A2 25/20 SJTW".somfysystems.com515S2 15/38 RH SJTWDerived (model name) · Observed 2026-10-07 · Retrieved 2026-10-07 · Public web pageUsed for: 51346, 51347

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Verifiable indicators

Sources