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Siemens 3RW5125-1XC14-0S — Soft Starters

Siemens 3RW5125-1XC14-0S Soft Starter, 25.5 A, 200-480 V

MPN3RW5125-1XC14-0S

Siemens SIRIUS 3RW5125-1XC14-0S soft starter, 25.5 A minimum, 200-480 VAC, Trip Class 10A/10E/20E, with PROFIBUS, Modbus RTU, PROFINET, analog output, and HMI.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RW5125-1XC14-0S — Power & Motor Rating
ParameterValue
Rated motor power at 400 V (40 °C)30 W
Rated motor power at 230 V (40 °C)18.5 W
Rated operational current at 40 °C109 A
Rated operational current at 50 °C96 A
Rated operational current at 60 °C87.5 A
Rated insulation voltage480 V
Minimum settable current (% of Ie)15 %; Relative to smallest settable Ie
Power loss during startup (50 °C)744 W
3RW5125-1XC14-0S — Control & Connection
ParameterValue
Control supply voltage typeAC
Main circuit terminal typebox terminal
Control circuit wire range, solid1x (0.5 ... 4.0 mm²), 2x (0.5 ... 2.5 mm²)
Control circuit wire range, finely stranded (with ferrule)1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.5 mm²)
Analog outputYes; 4 ... 20 mA (default) / 0 ... 10 V (parameterizable with High Feature HMI)
Auxiliary contact rated current, AC-15 at 250 V3 A
Control supply voltage tolerance, AC 50 Hz (max.)10 %
Control supply voltage tolerance, AC 50 Hz (min.)-15 %
Control supply voltage tolerance, AC 60 Hz (max.)10 %
Control supply voltage tolerance, AC 60 Hz (min.)-15 %
Control supply frequency tolerance (max.)10 %
Control supply frequency tolerance (min.)-10 %
Operating frequency tolerance (max.)10 %
Operating frequency tolerance (min.)-10 %
Operating voltage tolerance, inside-delta (max.)10 %
Operating voltage tolerance, inside-delta (min.)-15 %
3RW5125-1XC14-0S — Protection & Features
ParameterValue
Motor overload protectionYes
Adjustable current limitationYes
Inside-delta connectionYes
Intrinsic device protectionYes
Pollution degree3, acc. to IEC 60947-4-2
3RW5125-1XC14-0S — Mechanical
ParameterValue
Height321 mm
Width185 mm
Depth203 mm
Weight5.6 kg
Mounting position+/- 10° rotation possible and can be tilted forward or backward on vertical mounting surface
Fastening methodscrew fixing
Mounting clearance, top100 mm
Mounting clearance, bottom75 mm
Mounting clearance, side5 mm
Mounting clearance, front10 mm
3RW5125-1XC14-0S — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C; Please observe derating at temperatures of 40 °C or above
Storage / transport temperature range-40 ... +80 °C
Max. installation altitude5 000 mm; Derating as of 1000 m, see catalog
Ambient class during operation (IEC 60721)3K6 (no ice formation, only occasional condensation), 3C3 (no salt mist), 3S2 (sand must not get into the devices), 3M6
Ambient class during transport (IEC 60721)2K2, 2C1, 2S1, 2M2 (max. fall height 0.3 m)
3RW5125-1XC14-0S — Specifications
ParameterValue
Trip ClassCLASS 10A (default) / 10E / 20E; acc. to IEC 60947-4-2
Number Of Controlled Phases3
Utilization category according to IEC 60947-4-2AC-53b
Product Feature Integrated Bypass Contact SystemNo
Start-Up Ramp Time Of Soft Starter0 ... 20 s
Ramp-Down Time Of Soft Starter0 ... 20 s
3RW5125-1XC14-0S — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

Soft starter for motor control panels

The Siemens 3RW5125-1XC14-0S is a SIRIUS soft starter sized for a minimum motor current of 25.5 A on a 200-480 VAC three-phase supply. The Trip Class defaults to CLASS 10A per IEC 60947-4-2, meaning it protects standard induction motors during start-up by limiting current and torque — the 10-second thermal curve suits most pump, fan, and conveyor loads without nuisance tripping. It also supports CLASS 10E and 20E for extended ramp times on high-inertia loads. Three fieldbus slices are built in: PROFIBUS, Modbus RTU, and PROFINET standard, so it drops into existing automation architectures without an external gateway. The analog output is configurable as 4-20 mA or 0-10 V, giving the PLC a direct read of motor current or power factor. An HMI-Standard and HMI-High Feature interface are onboard for local parameterization and diagnostics, including an error logbook. Mounting is screw-fixing on a vertical surface, with ±10° rotation and tilt allowed. The dimensions are 321 mm high, 185 mm wide, and 203 mm deep — a substantial footprint that needs clear panel space. Clearance requirements: 100 mm above, 75 mm below, 10 mm forward, 5 mm to the side, and zero backward.

Frequently asked questions

Does the 3RW5125-1XC14-0S have analog output and HMI?

Yes. The analog output is 4-20 mA by default, parameterizable to 0-10 V with the High Feature HMI. Both HMI-Standard and HMI-High Feature interfaces are onboard, along with an error logbook for diagnostics.

Does the 3RW5125-1XC14-0S include a bypass contactor?

The evidence does not state an integrated bypass contactor. The soft starter supports inside-delta circuit configuration and includes soft torque, voltage ramp, and ramp-down (soft stop) features, but a separate bypass contactor may be needed depending on the application design.

MPN
3RW5125-1XC14-0S