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
- 3RW4047-1BB14
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3RW4047-1BB14, Soft Starter, 55 kW, 106 A, 200 to 480V AC
Description
About the 3RW4047-1BB14
About the 3RW4047-1BB14
Siemens 3RW40 Soft Starter Series – Overview
Siemens 3RW40 soft starters are advanced compact motor starting solutions designed for smooth starting and stopping of three-phase asynchronous motors in industrial applications. The 3RW40 series focuses on reducing mechanical stress, limiting inrush current, and providing enhanced motor protection compared to basic soft starters. With integrated bypass functionality and flexible configuration options, Siemens 3RW40 soft starters are well suited for pumps, fans, compressors, conveyors, and general industrial machinery requiring reliable and efficient motor starting.
Product Description: 3RW4047-1BB14
The Siemens 3RW4047-1BB14 is a SIRIUS S3 frame motor soft starter rated for 106 A continuous current and specified for up to 55 kW at 400 V (30 kW at 230 V). It is designed for three-phase supply voltages in the 200–480 V AC range and accepts a control supply of 110–230 V AC/DC, making it suitable for global industrial panels. Typical motor compatibility is mid-size three‑phase induction motors in the 30 kW–55 kW range depending on system voltage; at 400 V it supports motors up to 55 kW, while at 230 V the applicable motor rating is 30 kW. This unit is aimed at applications that benefit from reduced mechanical and electrical stress at start and stop—common uses include pumps, fans, compressors, and conveyors where limiting inrush current, avoiding belt slip or water hammer, and extending drivetrain life are priorities. Model-specific features verified for this SKU include two‑phase control with adjustable start voltage (start-up voltage adjustable between ~40–100% of line), adjustable ramp-up and ramp-down (soft stop) and current limiting, integrated bypass contacts to reduce power loss during run, and built-in electronic motor overload and intrinsic device protection for reliable operation in standard cabinet environments.
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 | Yes |
| product function: motor overload protection | Yes |
| product function: evaluation of thermistor motor protection | No |
| product function: external reset | Yes |
| product function: adjustable current limitation | Yes |
| 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 16
| operational current: at 40 °C rated value | 106 A |
|---|---|
| operational current: at 50 °C rated value | 98 A |
| operational current: at 60 °C rated value | 90 A |
| at 230 V: at standard circuit at 40 °C rated value | 30 kW |
| at 400 V: at standard circuit at 40 °C rated value | 55 kW |
| yielded mechanical performance [hp] for 3-phase AC motor at 200/208 V at standard circuit at 50 °C rated value | 30 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 [%] | 20 % |
| adjustable motor current for motor overload protection minimum rated value | 46 A |
| continuous operating current [% of Ie] at 40 °C | 115 % |
| power loss [W] at operational current at 40 °C during operation typical | 21 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 92 specifications ↓ Show less ↑49 more values in Identification, Mechanical data, Connections/ Terminals, Ambient conditions, UL/CSA ratings, Approvals Certificates, Logistics.
Identification 9
| Part number | 3RW4047-1BB14 |
|---|---|
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 4011209693326 |
| ETIM class | EC000640 |
| eCl@ss | 27370907 |
Mechanical data 11
| size of engine control device | S3 |
|---|---|
| width | 70 mm |
| height | 170 mm |
| depth | 190 mm |
| fastening method | screw and snap-on mounting |
| mounting position | With additional fan: With vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back Without additional fan: With vertical mounting surface +/-10° rotatable, with vertical mounting surface +/- 10° t |
| required spacing with side-by-side mounting: upwards | 60 mm |
| required spacing with side-by-side mounting: at the side | 30 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 9
| 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 | 2 |
| number of CO contacts for auxiliary contacts | 1 |
| type of connectable conductor cross-sections for main contacts for box terminal using the front clamping point: solid | 2x (2.5 ... 16 mm2) |
| type of connectable conductor cross-sections for AWG cables for main contacts for box terminal: using the back clamping point | 2x (10 ... 1/0) |
| type of connectable conductor cross-sections for DIN cable lug for main contacts: finely stranded | 2 x (10 ... 50 mm2) |
| 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 | 30 hp |
|---|---|
| at 460/480 V: at standard circuit at 50 °C rated value | 75 hp |
| contact rating of auxiliary contacts according to UL | B300 / R300 |
Approvals Certificates 1
| Environmental Product Declaration: global warming potential [CO2 eq] / during manufacturing | 23.7 kg |
|---|
Logistics 7
| Net weight | 1.856 kg |
|---|---|
| Package dimensions | 217 × 181 × 88 mm |
| Country of origin | CZ |
| Shipping weight | 2.356 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 3RW4047-1BB14
What is the rated current of 3RW4047-1BB14?
The rated current of 3RW4047-1BB14 is 106 A.
Which supply voltage is 3RW4047-1BB14 rated for?
The rated operational voltage of 3RW4047-1BB14 is 200–480 V AC.
What motor power is 3RW4047-1BB14 rated for?
The rated motor power of 3RW4047-1BB14 is 55 kW.
Which control voltage does 3RW4047-1BB14 need?
The control voltage range of 3RW4047-1BB14 is 110–230 V.
What is the HS code of 3RW4047-1BB14 for customs?
The tariff (HS) code on file for 3RW4047-1BB14 is 853710.
What is the EAN of 3RW4047-1BB14?
The EAN (GTIN) of 3RW4047-1BB14 is 4011209693326.
Where does 3RW4047-1BB14 ship from, and how fast?
3RW4047-1BB14 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 3RW40
- Brand
- Siemens
- Series
- SIRIUS 3RW40
