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
- 3RW5056-6AB14
- Model no
- 3RW50
In stock · 26
Dispatch
Planned dispatch date. We aim to ship within 1 business day. Depending on warehouse workload it can take 2–3 business days.
· From Türkiye
0
3RW5056-6AB14, Soft Starter, 90 kW, 171 A, 200 to 480V AC
Description
About the 3RW50
About the 3RW50
Siemens 3RW50 Soft Starter Series – Overview
Siemens 3RW50 soft starters are high-performance motor starting solutions designed for demanding industrial applications requiring reliable control of three-phase asynchronous motors. The 3RW50 series focuses on reducing mechanical stress, limiting inrush current, and supporting higher motor power ratings compared to compact soft starters. With robust construction and advanced motor protection capabilities, Siemens 3RW50 soft starters are well suited for heavy-duty applications such as large pumps, compressors, conveyors, mixers, and industrial process machinery where dependable motor starting is critical.
Product Description: 3RW5056-6AB14
The Siemens 3RW5056-6AB14 is a SIRIUS 3RW50 soft starter rated for 171 A (rated operational current at 40 °C) and specified for three-phase motors up to 90 kW at 400 V (45 kW at 230 V). It is designed for supply voltages from 200 to 480 V AC and accepts a control supply of 110–250 V AC. This model is suitable for medium‑to‑large industrial motors such as pumps, compressors and conveyors where controlled ramp-up and ramp-down reduce mechanical stress and limit inrush current. Verified features for this SKU include voltage ramp (soft start) and ramp-down, adjustable current limitation, Soft-Torque start behaviour, built‑in bypass contact for reduced heat dissipation during run, thermistor (PTC/Klixon) input and electronic motor overload evaluation for motor protection, and optional communication modules (PROFINET, PROFIBUS, Modbus TCP/RTU) when required for integration. These capabilities make the 3RW5056-6AB14 appropriate where reliable motor protection, remote reset and factory‑network integration are needed without moving to a larger starter family.
Specification
Full specification
General 16
| product brand name | SIRIUS |
|---|---|
| product category | Hybrid switching devices |
| product designation | Soft starter |
| product type designation | 3RW50 |
| manufacturer's article number: of standard HMI module usable | 3RW5980-0HS00 |
| manufacturer's article number: of high feature HMI module usable | 3RW5980-0HF00 |
| manufacturer's article number: of communication module PROFINET standard usable | 3RW5980-0CS00 |
| manufacturer's article number: of communication module PROFIBUS usable | 3RW5980-0CP00 |
| manufacturer's article number: of communication module Modbus TCP usable | 3RW5980-0CT00 |
| manufacturer's article number: of communication module Ethernet/IP | 3RW5980-0CE00 |
| manufacturer's article number: of circuit breaker usable at 400 V | 3VA2220-7MN32-0AA0; Type of assignment 1, Iq = 20 kA |
| manufacturer's article number: of circuit breaker usable at 500 V | 3VA2220-7MN32-0AA0; Type of assignment 1, Iq = 20 kA |
| manufacturer's article number: of the gG fuse usable up to 690 V | 3NA3244-6; Type of coordination 1, Iq = 65 kA |
| manufacturer's article number: of full range R fuse link for semiconductor protection usable up to 690 V | 3NE1 230-0; Type of coordination 2, Iq = 65 kA |
| manufacturer's article number: of back-up R fuse link for semiconductor protection usable up to 690 V | 3NE3 335; Type of coordination 2, Iq = 65 kA |
| manufacturer's article number: of line contactor usable up to 480 V | 3RT1056 |
General technical data 48
| starting voltage [%] | 30 ... 100 % |
|---|---|
| stopping voltage [%] | 50 %; non-adjustable |
| start-up ramp time of soft starter | 0 ... 20 s |
| ramp-down time of soft starter | 0 ... 20 s |
| current limiting value [%] adjustable | 130 ... 700 % |
| certificate of suitability: CE marking | Yes |
| certificate of suitability: UL approval | Yes |
| certificate of suitability: CSA approval | Yes |
| product component: HMI-High Feature | No |
| product component: is supported HMI-Standard | Yes |
| product component: is supported HMI-High Feature | Yes |
| product feature integrated bypass contact system | Yes |
| number of controlled phases | 2 |
| buffering time in the event of power failure: for main current circuit | 100 ms |
| buffering time in the event of power failure: for control circuit | 100 ms |
| insulation voltage rated value | 600 V |
| degree of pollution | 3, acc. to IEC 60947-4-2 |
| impulse voltage rated value | 6 kV |
| blocking voltage of the thyristor maximum | 1 400 V |
| service factor | 1 |
| surge voltage resistance rated value | 6 kV |
| maximum permissible voltage for protective separation: between main and auxiliary circuit | 600 V |
| shock resistance | 15 g / 11 ms, from 12 g / 11 ms with potential contact lifting |
| vibration resistance | 15 mm to 6 Hz; 2 g to 500 Hz |
| utilization category according to IEC 60947-4-2 | AC-53a |
| reference code according to IEC 81346-2 | Q |
| Substance Prohibitance (day/month/year) | 09/23/2019 |
| SVHC substance name | Lead CAS-No. 7439-92-1 Lead monoxide (lead oxide) CAS-No. 1317-36-8 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one CAS-No. 71868- 10-5 Melamine CAS-No. 108-78-1 6,6'-di-tert-butyl-2,2'-methylenedi-p-cresol CAS-No. 119-47-1 |
| product function: ramp-up (soft starting) | Yes |
| product function: soft stopping | Yes |
| product function: Soft Torque | Yes |
| product function: adjustable current limitation | Yes |
| product function: pump stop | Yes |
| product function: intrinsic device protection | Yes |
| product function: motor overload protection | Yes; Electronic motor overload protection |
| product function: evaluation of thermistor motor protection | No |
| product function: auto-RESET | Yes |
| product function: manual RESET | Yes |
| product function: remote reset | Yes; By turning off the control supply voltage |
| product function: communication function | Yes |
| product function: operating measured value display | Yes; Only in conjunction with special accessories |
| product function: error logbook | Yes; Only in conjunction with special accessories |
| product function: via software parameterizable | No |
| product function: via software configurable | Yes |
| product function: PROFIenergy | Yes; in connection with the PROFINET Standard communication module |
| product function: voltage ramp | Yes |
| product function: torque control | No |
| product function: analog output | Yes; 4 ... 20 mA (default) / 0 ... 10 V (parameterizable with High Feature HMI) |
Power Electronics 22
| operational current: at 40 °C rated value | 171 A |
|---|---|
| operational current: at 50 °C rated value | 153 A |
| operational current: at 60 °C rated value | 141 A |
| operating voltage: rated value | 200 ... 480 V |
| relative negative tolerance of the operating voltage | -15 % |
| relative positive tolerance of the operating voltage | 10 % |
| operating power for 3-phase motors: at 230 V at 40 °C rated value | 45 kW |
| operating power for 3-phase motors: at 400 V at 40 °C rated value | 90 kW |
| Operating frequency 1 rated value | 50 Hz |
| Operating frequency 2 rated value | 60 Hz |
| relative negative tolerance of the operating frequency | -10 % |
| relative positive tolerance of the operating frequency | 10 % |
| adjustable motor current: at rotary coding switch on switch position 1 | 81 A |
| adjustable motor current: minimum | 81 A |
| minimum load [%] | 15 %; Relative to smallest settable Ie |
| power loss [W] for rated value of the current at AC: at 40 °C after startup | 29 W |
| power loss [W] for rated value of the current at AC: at 50 °C after startup | 23 W |
| power loss [W] for rated value of the current at AC: at 60 °C after startup | 20 W |
| power loss [W] at AC at current limitation 350%: at 40 °C during startup | 1 751 W |
| power loss [W] at AC at current limitation 350%: at 50 °C during startup | 1 478 W |
| power loss [W] at AC at current limitation 350%: at 60 °C during startup | 1 308 W |
| type of the motor protection | Electronic, tripping in the event of thermal overload of the motor |
Show all 179 specifications ↓ Show less ↑93 more values in Identification, Control circuit/ Control, Inputs/ Outputs, Installation/ mounting/ dimensions, Connections/ Terminals, Ambient conditions, Electromagnetic compatibility, Communication/ Protocol, UL/CSA ratings, Electrical Safety, ATEX, Approvals Certificates, Logistics.
Identification 10
| Part number | 3RW5056-6AB14 |
|---|---|
| Type designation | 3RW50 |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 4047621060415 |
| ETIM class | EC000640 |
| eCl@ss | 27370907 |
Control circuit/ Control 15
| type of voltage of the control supply voltage | AC |
|---|---|
| control supply voltage at AC: at 50 Hz | 110 ... 250 V |
| control supply voltage at AC: at 60 Hz | 110 ... 250 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 frequency | 50 ... 60 Hz |
| relative negative tolerance of the control supply voltage frequency | -10 % |
| relative positive tolerance of the control supply voltage frequency | 10 % |
| control supply current in standby mode rated value | 30 mA |
| holding current in bypass operation rated value | 80 mA |
| inrush current by closing the bypass contacts maximum | 2.5 A |
| inrush current peak at application of control supply voltage maximum | 12.2 A |
| duration of inrush current peak at application of control supply voltage | 2.2 ms |
| design of the overvoltage protection | Varistor |
| design of short-circuit protection for control circuit | 4 A gG fuse (Icu=1 kA), 6 A quick-acting fuse (Icu=1 kA), C1 miniature circuit breaker (Icu= 600 A), C6 miniature circuit breaker (Icu= 300 A); Is not part of scope of supply |
Inputs/ Outputs 7
| number of digital inputs | 1 |
|---|---|
| number of digital outputs | 3 |
| not parameterizable | 2 |
| digital output version | 2 normally-open contacts (NO) / 1 changeover contact (CO) |
| number of analog outputs | 1 |
| switching capacity current of the relay outputs: at AC-15 at 250 V rated value | 3 A |
| switching capacity current of the relay outputs: at DC-13 at 24 V rated value | 1 A |
Installation/ mounting/ dimensions 11
| mounting position | with vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back |
|---|---|
| fastening method | screw fixing |
| height | 198 mm |
| width | 120 mm |
| depth | 249 mm |
| required spacing with side-by-side mounting: forwards | 10 mm |
| required spacing with side-by-side mounting: backwards | 0 mm |
| required spacing with side-by-side mounting: upwards | 100 mm |
| required spacing with side-by-side mounting: downwards | 75 mm |
| required spacing with side-by-side mounting: at the side | 5 mm |
| weight without packaging | 5.2 kg |
Connections/ Terminals 13
| type of electrical connection: for main current circuit | busbar connection |
|---|---|
| type of electrical connection: for control circuit | screw-type terminals |
| width of connection bar maximum | 25 mm |
| type of connectable conductor cross-sections for main contacts for box terminal: using the front clamping point solid | 16 ... 120 mm2 |
| type of connectable conductor cross-sections: for AWG cables for main current circuit solid | 4 ... 250 kcmil |
| type of connectable conductor cross-sections: for DIN cable lug for main contacts stranded | 16 ... 95 mm2 |
| type of connectable conductor cross-sections: for control circuit solid | 1x (0.5 ... 4.0 mm2), 2x (0.5 ... 2.5 mm2) |
| wire length: between soft starter and motor maximum | 800 m |
| wire length: at the digital inputs at AC maximum | 1 000 m |
| tightening torque: for main contacts with screw-type terminals | 10 ... 14 N·m |
| tightening torque: for auxiliary and control contacts with screw-type terminals | 0.8 ... 1.2 N·m |
| tightening torque [lbf·in]: for main contacts with screw-type terminals | 89 ... 124 lbf·in |
| tightening torque [lbf·in]: for auxiliary and control contacts with screw-type terminals | 7 ... 10.3 lbf·in |
Ambient conditions 6
| installation altitude at height above sea level maximum | 5 000 m |
|---|---|
| ambient temperature: during operation | -25 ... +60 °C; Please observe derating at temperatures of 40 °C or above |
| ambient temperature: during storage and transport | -40 ... +80 °C |
| environmental category: during operation according to IEC 60721 | 3K6 (no ice formation, only occasional condensation), 3C3 (no salt mist), 3S2 (sand must not get into the devices), 3M6 |
| 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 transport according to IEC 60721 | 2K2, 2C1, 2S1, 2M2 (max. fall height 0.3 m) |
Electromagnetic compatibility 1
| EMC emitted interference | acc. to IEC 60947-4-2: Class A |
|---|
Communication/ Protocol 5
| communication module is supported: PROFINET standard | Yes |
|---|---|
| communication module is supported: EtherNet/IP | Yes |
| communication module is supported: Modbus RTU | Yes |
| communication module is supported: Modbus TCP | Yes |
| communication module is supported: PROFIBUS | Yes |
UL/CSA ratings 7
| of circuit breaker: usable for Standard Faults at 460/480 V according to UL | Siemens type: 3VA5225, max. 250 A; Iq = 10 kA |
|---|---|
| of circuit breaker: usable for High Faults at 460/480 V according to UL | Siemens type: 3VA52, max. 250 A; Iq max = 65 kA |
| of the fuse: usable for Standard Faults up to 575/600 V according to UL | Type: Class RK5 / K5, max. 400 A; Iq = 10 kA |
| of the fuse: usable for High Faults up to 575/600 V according to UL | Type: Class J, max. 350 A; Iq = 100 kA |
| operating power [hp] for 3-phase motors: at 200/208 V at 50 °C rated value | 50 hp |
| operating power [hp] for 3-phase motors: at 220/230 V at 50 °C rated value | 50 hp |
| operating power [hp] for 3-phase motors: at 460/480 V at 50 °C rated value | 100 hp |
Electrical Safety 2
| protection class IP on the front according to IEC 60529 | IP00; IP20 with cover |
|---|---|
| touch protection on the front according to IEC 60529 | finger-safe, for vertical contact from the front with cover |
ATEX 8
| Safety Integrity Level (SIL) according to IEC 61508 relating to ATEX | SIL 1 |
|---|---|
| PFHD with high demand rate according to IEC 61508 relating to ATEX | 9E-6 1/h |
| PFDavg with low demand rate according to IEC 61508 relating to ATEX | 0.09 |
| hardware fault tolerance according to IEC 61508 relating to ATEX | 0 |
| T1 value for proof test interval or service life according to IEC 61508 relating to ATEX | 3 a |
| certificate of suitability: ATEX | Yes |
| certificate of suitability: IECEx | Yes |
| certificate of suitability: UKEX | Yes |
Approvals Certificates 1
| Environmental Product Declaration: global warming potential [CO2 eq] / during manufacturing | 31.2 kg |
|---|
Logistics 7
| Net weight | 5.214 kg |
|---|---|
| Package dimensions | 297 × 228 × 180 mm |
| Country of origin | CZ |
| Shipping weight | 6.214 kg |
| Ships from | Türkiye |
| Dispatch | 12 Nov |
| Stock | In stock |
Source: manufacturer data · Last verified: 30 Oct 2026
Documents
Documents for 3RW5056-6AB14
No documents are on file for this part yet.
Ask us for the datasheet
Quick answers
Questions about the 3RW50
What is the rated current of 3RW50?
The rated current of 3RW50 is 171 A.
Which supply voltage is 3RW50 rated for?
The rated operational voltage of 3RW50 is 200–480 V AC.
What motor power is 3RW50 rated for?
The rated motor power of 3RW50 is 90 kW.
Which control voltage does 3RW50 need?
The control voltage range of 3RW50 is 110–250 V.
What is the HS code of 3RW50 for customs?
The tariff (HS) code on file for 3RW50 is 853710.
What is the EAN of 3RW50?
The EAN (GTIN) of 3RW50 is 4047621060415.
Where does 3RW50 ship from, and how fast?
3RW50 ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival. Stock items are dispatched within 1–2 business days.
Guides
Guides for soft starters
Soft Starter vs Autotransformer Starter Compared
A side-by-side comparison of soft starters and autotransformer (Korndorfer) starters covering torque, supply-side current, transition type, maintenance, cost, and load fit.
Different Types of Soft Starters: A Complete Guide for Engineers
Explore the different types of soft starters, from analog to digital and solid-state models, with key features for industrial motor control. Shop at Stoklink.
Reviews
Customer reviews
Series
Siemens SIRIUS 3RW50
- Brand
- Siemens
- Series
- SIRIUS 3RW50
