What supply voltage and frequency does each use?

Rated voltage — Somfy 525A2 25/20 SJTW: 120 V; Somfy 525A2 RTS CMO: 120 V. Mains frequency — Somfy 525A2 25/20 SJTW: 60 Hz; Somfy 525A2 RTS CMO: 60 Hz. Power supply type — Somfy 525A2 25/20 SJTW: AC mains; Somfy 525A2 RTS CMO: AC mains.

What torque and speed is each rated for?

Rated torque — Somfy 525A2 25/20 SJTW: 25 Nm; Somfy 525A2 RTS CMO: 25 Nm. Rated speed — Somfy 525A2 25/20 SJTW: 20 rpm; Somfy 525A2 RTS CMO: 20 rpm.

What certifications are on record for each?

Marks stated by vendor — Somfy 525A2 RTS CMO: UL.

Which durability indicators does each publish?

OpenAxia does not rate reliability; the published indicators are: Short-time duty (S2) — Somfy 525A2 25/20 SJTW: 5 min. IP rating — Somfy 525A2 25/20 SJTW: IP44; Somfy 525A2 RTS CMO: IP44.

Somfy 525A2: 25/20 SJTW vs RTS CMO Compared

Cable length — Somfy 525A2 25/20 SJTW: 2 m^{[1; 2026-10-07]}; Somfy 525A2 RTS CMO: 3.6 m^{[2; 2026-10-07]}.

Operating temp. (max) — Somfy 525A2 25/20 SJTW: 60 °C^{[1; 2026-10-07]}; Somfy 525A2 RTS CMO: 40 °C^{[2; 2026-10-07]}.

Last verified: 2026-10-07

When to choose Somfy 525A2 25/20 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 25 Nm^{[1; 2026-10-07]}.
For a rated speed of 20 rpm^{[1; 2026-10-07]}.

When to choose Somfy 525A2 RTS CMO

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 25 Nm^{[2; 2026-10-07]}.
For a rated speed of 20 rpm^{[2; 2026-10-07]}.

Verifiable indicators

Short-time duty (S2) — Somfy 525A2 25/20 SJTW: 5 min^{[1; 2026-10-07]}. Somfy 525A2 RTS CMO: Not published.

Rated life — Somfy 525A2 25/20 SJTW: Not published. Somfy 525A2 RTS CMO: Not published.

Thermal protection — Somfy 525A2 25/20 SJTW: Not published. Somfy 525A2 RTS CMO: Not published.

IP rating — Somfy 525A2 25/20 SJTW: IP44^{[1; 2026-10-07]}; Somfy 525A2 RTS CMO: IP44^{[2; 2026-10-07]}.

Comparison table
Property	Somfy 525A2 25/20 SJTWSomfy1043424	Somfy 525A2 RTS CMOSomfy1043426
Series & variant axes
Series	LT50	LT50
Control protocol	—	RTS (from model name)
Power supply	AC mains	AC mains
Torque	25 Nm	25 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	180 W^{[3; 2026-09-30]}	180 W^{[3; 2026-09-30]}
Standby power	0 W^{[3; 2026-10-01]}	0 W^{[3; 2026-10-01]}
Rated current	1.6 A^{[1; 2026-10-07]}	1.6 A^{[2; 2026-10-07]}
Cable lengthDiffers: 2 m^{[1; 2026-10-07]} vs 3.6 m^{[2; 2026-10-07]}	2 m^{[1; 2026-10-07]}	3.6 m^{[2; 2026-10-07]}
Drive performance
Rated torque	25 Nm^{[1; 2026-10-07]}	25 Nm^{[2; 2026-10-07]}
Rated speed	20 rpm^{[1; 2026-10-07]}	20 rpm^{[2; 2026-10-07]}
Short-time duty (S2)	5 min^{[1; 2026-10-07]}	Not published
Limits & protection
Limit setting	Not published	Electronic^{[2; 2026-10-07]}
Limit range	Not published	34 turns^{[2; 2026-10-07]}
Control & communication
Control protocol	Not published	RTS^{[3; 2026-09-30]}
Radio frequency	Not published	433.42 MHz^{[3; 2026-10-01]}
Radio range	Not published	50 m^{[3; 2026-10-01]}
Max paired transmitters	Not published	12 pcs^{[3; 2026-10-01]}
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: 60 °C^{[1; 2026-10-07]} vs 40 °C^{[2; 2026-10-07]}	60 °C^{[1; 2026-10-07]}Highest stated	40 °C^{[2; 2026-10-07]}
Noise level	56 dB(A)^{[3; 2026-09-30]}	Not published
Compliance & declarations
Marks stated by vendor	Not published	UL^{[3; 2026-10-01]}
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 525A2 25/20 SJTW: 120 V; Somfy 525A2 RTS CMO: 120 V. Mains frequency — Somfy 525A2 25/20 SJTW: 60 Hz; Somfy 525A2 RTS CMO: 60 Hz. Power supply type — Somfy 525A2 25/20 SJTW: AC mains; Somfy 525A2 RTS CMO: AC mains.
What torque and speed is each rated for?: Rated torque — Somfy 525A2 25/20 SJTW: 25 Nm; Somfy 525A2 RTS CMO: 25 Nm. Rated speed — Somfy 525A2 25/20 SJTW: 20 rpm; Somfy 525A2 RTS CMO: 20 rpm.
What certifications are on record for each?: Marks stated by vendor — Somfy 525A2 RTS CMO: UL.
Which durability indicators does each publish?: OpenAxia does not rate reliability; the published indicators are: Short-time duty (S2) — Somfy 525A2 25/20 SJTW: 5 min. IP rating — Somfy 525A2 25/20 SJTW: IP44; Somfy 525A2 RTS CMO: IP44.

Sources

↑Somfy PDF catalogue lt50ra-d0025service.somfy.comRated voltage: Voltage Supply: 120V AC, 60Hz [1043024] (p. 1)Manufacturer-stated · Observed 2026-10-07 · Retrieved 2026-10-06 · Public web pageUsed for: 51075, 51077, 51076, 51083, 51081, 51082, 51084, 51085, 51078, 51079, 51080
↑Somfy PDF catalogueservice.somfy.comRated voltage: Voltage Supply: 120V AC, 60Hz [1043020] (p. 1)Manufacturer-stated · Observed 2026-10-07 · Retrieved 2026-10-06 · Public web pageUsed for: 51173, 51175, 51174, 51183, 51181, 51182, 51184, 51179, 51180, 51178, 51176, 51177
↑Somfy Systems (North America) manufacturer site (product catalog)somfysystems.comRated power input: Consumption during operation 180 WManufacturer-stated · Observed 2026-09-30 · Retrieved 2026-09-30 · Public web pageUsed for: 3965, 4026, 10319, 10350, 4028, 10347, 10349, 10348, 3963, 10351

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Somfy 525A2 25/20 SJTW vs Somfy 525A2 RTS CMO

When to choose Somfy 525A2 25/20 SJTW

When to choose Somfy 525A2 RTS CMO

Verifiable indicators

Questions and answers

Sources