How to Select and Size a Soft Starter for a Motor
How to size a soft starter correctly by full-load current, IEC 60947-4-2 duty class, starting torque against the load, control method, wiring topology and...
- Part number
- 3RW3028-1BB14
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3RW3028-1BB14, Soft Starter, 18.5 kW, 38 A, 200 to 480V AC
Description
About the 3RW3028-1BB14
About the 3RW3028-1BB14
Siemens 3RW30 Soft Starter Series – Overview
Siemens 3RW30 soft starters are compact and cost-effective motor starting solutions designed for basic soft starting of three-phase asynchronous motors in standard industrial applications. The 3RW30 series focuses on reducing mechanical stress and limiting inrush current during motor start-up, providing a simple and reliable alternative to direct-on-line starting. With a straightforward design and easy commissioning, Siemens 3RW30 soft starters are well suited for pumps, fans, compressors, conveyors, and other simple motor-driven machines where basic motor starting control is sufficient.
Product Description: 3RW3028-1BB14
The Siemens 3RW3028-1BB14 is a SIRIUS 3RW30 soft starter rated for 38 A continuous output and specified for 18.5 kW motors at 400 V (11 kW at 230 V). It is designed for 3‑phase supply voltages from 200 to 480 V AC and uses a separate control supply rated 110–230 V AC/DC. The device uses two‑phase, continuous voltage control (voltage ramp) to limit starting torque and current, reducing mechanical stress and smoothing network load during start-up. The compact S0 frame and integrated bypass (jumper) contacts make it suitable for space‑constrained control panels. Typical applications include pumps, fans, small compressors and conveyors where straightforward, repeatable soft starting is required and no integrated motor overload protection is needed. Standout verified features for this SKU are its 38 A rating at 40 °C, the wide 200–480 V AC main voltage class, two‑phase continuous voltage control, integrated bypass contacts and IP20 enclosure for standard panel mounting.
Specification
Full specification
General technical data 16
| product brand name | SIRIUS |
|---|---|
| product designation | Soft starter |
| product feature: integrated bypass contact system | Yes |
| product feature: thyristors | Yes |
| product function: intrinsic device protection | No |
| product function: motor overload protection | No |
| product function: evaluation of thermistor motor protection | No |
| product function: external reset | No |
| product function: adjustable current limitation | No |
| product function: inside-delta circuit | No |
| product component motor brake output | No |
| insulation voltage rated value | 600 V |
| degree of pollution | 3, acc. to IEC 60947-4-2 |
| blocking voltage of the thyristor maximum | 1 600 V |
| reference code according to EN 61346-2 | Q |
| reference code according to DIN 40719 extended according to IEC 204-2 according to IEC 750 | G |
Power Electronics 15
| operational current: at 40 °C rated value | 38 A |
|---|---|
| operational current: at 50 °C rated value | 34 A |
| operational current: at 60 °C rated value | 31 A |
| at 230 V: at standard circuit at 40 °C rated value | 11 kW |
| at 400 V: at standard circuit at 40 °C rated value | 18.5 kW |
| yielded mechanical performance [hp] for 3-phase AC motor at 200/208 V at standard circuit at 50 °C rated value | 10 hp |
| operating frequency rated value | 50 ... 60 Hz |
| relative negative tolerance of the operating frequency | -10 % |
| relative positive tolerance of the operating frequency | 10 % |
| operating voltage at standard circuit rated value | 200 ... 480 V |
| relative negative tolerance of the operating voltage at standard circuit | -15 % |
| relative positive tolerance of the operating voltage at standard circuit | 10 % |
| minimum load [%] | 10 % |
| continuous operating current [% of Ie] at 40 °C | 115 % |
| power loss [W] at operational current at 40 °C during operation typical | 19 W |
Control circuit/ Control 11
| type of voltage of the control supply voltage | AC/DC |
|---|---|
| control supply voltage frequency 1 rated value | 50 Hz |
| control supply voltage frequency 2 rated value | 60 Hz |
| relative negative tolerance of the control supply voltage frequency | -10 % |
| relative positive tolerance of the control supply voltage frequency | 10 % |
| control supply voltage 1 at AC at 50 Hz | 110 ... 230 V |
| control supply voltage 1 at AC at 60 Hz | 110 ... 230 V |
| relative negative tolerance of the control supply voltage at AC at 50 Hz | -15 % |
| relative positive tolerance of the control supply voltage at AC at 50 Hz | 10 % |
| control supply voltage 1 at DC | 110 ... 230 V |
| display version for fault signal | red |
Show all 90 specifications ↓ Show less ↑48 more values in Identification, Mechanical data, Connections/ Terminals, Ambient conditions, UL/CSA ratings, Approvals Certificates, Logistics.
Identification 9
| Part number | 3RW3028-1BB14 |
|---|---|
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 4011209719477 |
| ETIM class | EC000640 |
| eCl@ss | 27370907 |
Mechanical data 11
| size of engine control device | S0 |
|---|---|
| width | 45 mm |
| height | 125 mm |
| depth | 150 mm |
| fastening method | screw and snap-on mounting |
| mounting position | With vertical mounting surface +/-10° rotatable, with vertical mounting surface +/- 10° tiltable to the front and back |
| required spacing with side-by-side mounting: upwards | 60 mm |
| required spacing with side-by-side mounting: at the side | 15 mm |
| required spacing with side-by-side mounting: downwards | 40 mm |
| wire length maximum | 300 m |
| number of poles for main current circuit | 3 |
Connections/ Terminals 8
| type of electrical connection: for main current circuit | screw-type terminals |
|---|---|
| type of electrical connection: for auxiliary and control circuit | screw-type terminals |
| number of NC contacts for auxiliary contacts | 0 |
| number of NO contacts for auxiliary contacts | 1 |
| number of CO contacts for auxiliary contacts | 0 |
| type of connectable conductor cross-sections for main contacts for box terminal using the front clamping point: finely stranded with core end processing | 2x (1 ... 2.5 mm2), 2x (2.5 ... 6 mm2) |
| type of connectable conductor cross-sections for AWG cables for main contacts for box terminal: using the front clamping point | 1x 8, 2x (16 ... 10) |
| type of connectable conductor cross-sections for auxiliary contacts: solid | 2x (0.5 ... 2.5 mm2) |
Ambient conditions 9
| installation altitude at height above sea level | 5 000 m |
|---|---|
| environmental category: during transport according to IEC 60721 | 2K2, 2C1, 2S1, 2M2 (max. fall height 0.3 m) |
| environmental category: during storage according to IEC 60721 | 1K6 (only occasional condensation), 1C2 (no salt mist), 1S2 (sand must not get inside the devices), 1M4 |
| environmental category: during operation according to IEC 60721 | 3K6 (no formation of ice, no condensation), 3C3 (no salt mist), 3S2 (sand must not get into the devices), 3M6 |
| ambient temperature: during operation | -25 ... +60 °C |
| ambient temperature: during storage | -40 ... +80 °C |
| derating temperature | 40 °C |
| protection class IP on the front according to IEC 60529 | IP20 |
| touch protection on the front according to IEC 60529 | finger-safe, for vertical contact from the front |
UL/CSA ratings 3
| at 220/230 V: at standard circuit at 50 °C rated value | 10 hp |
|---|---|
| at 460/480 V: at standard circuit at 50 °C rated value | 25 hp |
| contact rating of auxiliary contacts according to UL | B300 / R300 |
Approvals Certificates 1
| Environmental Product Declaration: global warming potential [CO2 eq] / during manufacturing | 11 kg |
|---|
Logistics 7
| Net weight | 0.623 kg |
|---|---|
| Package dimensions | 181 × 159 × 60 mm |
| Country of origin | CZ |
| Shipping weight | 1.123 kg |
| Ships from | Türkiye |
| Dispatch | 12 Nov |
| Stock | In stock |
Source: manufacturer data · Last verified: 30 Oct 2026
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Quick answers
Questions about the 3RW3028-1BB14
What is the rated current of 3RW3028-1BB14?
The rated current of 3RW3028-1BB14 is 38 A.
Which supply voltage is 3RW3028-1BB14 rated for?
The rated operational voltage of 3RW3028-1BB14 is 200–480 V AC.
What motor power is 3RW3028-1BB14 rated for?
The rated motor power of 3RW3028-1BB14 is 18.5 kW.
Which control voltage does 3RW3028-1BB14 need?
The control voltage range of 3RW3028-1BB14 is 110–230 V.
What is the HS code of 3RW3028-1BB14 for customs?
The tariff (HS) code on file for 3RW3028-1BB14 is 853710.
What is the EAN of 3RW3028-1BB14?
The EAN (GTIN) of 3RW3028-1BB14 is 4011209719477.
Where does 3RW3028-1BB14 ship from, and how fast?
3RW3028-1BB14 ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival. Stock items are dispatched within 1–2 business days.
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Series
Siemens SIRIUS 3RW30
- Brand
- Siemens
- Series
- SIRIUS 3RW30
