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Siemens 3RW5521-3HA16 — Soft Starters

Siemens 3RW5521-3HA16 Soft Starter, ATEX, 200-690 V

MPN3RW5521-3HA16
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Siemens SIRIUS 3RW5521-3HA16 soft starter, ATEX/IECEx certified, rated voltage 200-690 V, trip class 10A/10E/20E/30E per IEC 60947-4-2, with integrated Modbus RTU/TCP, EtherNet/IP, and PROFIBUS.

Siemens 3RW5521-3HA16 datasheet (PDF)
StockContact for availability
Lead timeIn Stock wk
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

3RW5521-3HA16 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS

Power & Motor Rating

3RW5521-3HA16 — Power & Motor Rating
ParameterValue
Rated motor power at 400 V (40 °C)11 kW
Rated motor power at 230 V (40 °C)5.5 kW
Rated operational current at 40 °C43.3 A
Rated operational current at 50 °C39 A
Rated operational current at 60 °C33.9 A
Rated insulation voltage690 V
Minimum settable current (% of Ie)10 %; Relative to set Ie
Power loss during startup (50 °C)283 W

Control & Connection

3RW5521-3HA16 — Control & Connection
ParameterValue
Control supply voltage typeAC
Main circuit terminal typebox terminal
Control circuit wire range, solid2x (0.25 ... 1.5 mm²)
Control circuit wire range, finely stranded (with ferrule)2x (0.25 ... 1.5 mm²)
Analog outputYes; 4 ... 20 mA (default) / 0 ... 10 V
Auxiliary contact rated current, AC-15 at 250 V3 A
Auxiliary contact rating (UL)R300-B300
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 %

Protection & Features

3RW5521-3HA16 — Protection & Features
ParameterValue
Motor overload protectionYes; Full motor protection (thermistor motor protection and electronic motor overload protection)
Thermistor motor protectionYes; Type A PTC or Klixon / Thermoclick
Adjustable current limitationYes
Inside-delta connectionYes; Only up to 600 V operating voltage
Intrinsic device protectionYes
Pollution degree3, acc. to IEC 60947-4-2

Mechanical

3RW5521-3HA16 — Mechanical
ParameterValue
Height306 mm
Width185 mm
Depth203 mm
Weight5.5 kg
Mounting positionVertical (can be rotated +/- 90° and tilted forward or backward +/- 22.5°)
Fastening methodscrew fixing
Mounting clearance, top100 mm
Mounting clearance, bottom75 mm
Mounting clearance, side5 mm
Mounting clearance, front10 mm

Environmental

3RW5521-3HA16 — 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 altitude2 000 m; 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)

Specifications

3RW5521-3HA16 — Specifications
ParameterValue
Trip ClassCLASS 10A / 10E (default) / 20E / 30E; acc. to IEC 60947-4-2
Number Of Controlled Phases3
Utilization category according to IEC 60947-4-2AC 53a
Product Feature Integrated Bypass Contact SystemYes
Start-Up Ramp Time Of Soft Starter0 ... 360 s
Ramp-Down Time Of Soft Starter0 ... 360 s

Electrical

3RW5521-3HA16 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable125 ... 800 %
Starting Voltage [%]20 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

ATEX-Certified Soft Starter for Hazardous Zones

The Siemens 3RW5521-3HA16 is a soft starter from the SIRIUS family, carrying both ATEX and IECEx certification for use in explosive atmospheres. Its rated voltage spans 200 to 690 V, and it offers selectable trip classes 10A, 10E (default), 20E, and 30E per IEC 60947-4-2 — meaning you can match the overload protection to the motor's thermal capacity and starting duty. The control supply accepts 110 to 250 V at both 50 and 60 Hz, simplifying panel wiring across regions.

Multi-Protocol Fieldbus and Analog Feedback

This soft starter natively supports Modbus RTU, Modbus TCP, EtherNet/IP, and PROFIBUS, so it drops into most common control networks without an external gateway. An analog output configurable as 4-20 mA or 0-10 V provides motor current or other process feedback to a PLC or drive controller. The integrated DC braking, voltage ramp, pump ramp down, and breakaway pulse functions cover soft-start and soft-stop needs for pumps, conveyors, and fans.

Mounting and Clearance Dimensions

The unit measures 185 mm wide, 306 mm high, and 203 mm deep. For proper ventilation and cable access, allow 100 mm clearance above, 75 mm below, 10 mm in front, and 5 mm on each side — no clearance needed at the rear. The screw-terminal option is not available on this variant; check the connection method on the nameplate.

Frequently asked questions

Does 3RW5521-3HA16 support Modbus RTU?

Yes, the 3RW5521-3HA16 supports Modbus RTU, Modbus TCP, EtherNet/IP, and PROFIBUS natively.

Where can I buy 3RW5521-3HA16?

The 3RW5521-3HA16 is sourced to order through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time.

MPN
3RW5521-3HA16