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
- 3RW5248-6AC14
- Model no
- 3RW52
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3RW5248-6AC14, Soft Starter, 315 kW, 570 A, 200 to 480V AC
Description
About the 3RW52
About the 3RW52
Siemens 3RW52 Soft Starter Series – Overview
Siemens 3RW52 soft starters are high-performance motor starting solutions designed for demanding industrial applications requiring precise and reliable control of three-phase asynchronous motors. The 3RW52 series focuses on reducing mechanical stress, limiting inrush current, and supporting higher motor power ratings with advanced protection functions compared to compact soft starters. With robust construction and enhanced motor protection capabilities, Siemens 3RW52 soft starters are well suited for heavy-duty applications such as large pumps, compressors, conveyors, mixers, and industrial process machinery where dependable motor starting and operational reliability are critical.
Product Description: 3RW5248-6AC14
The Siemens 3RW5248-6AC14 is a SIRIUS 3RW52 general‑performance soft starter rated for 570 A (Ie) and intended for three‑phase motor applications on 200…480 V AC mains. At standard inline connection the unit covers motors up to 315 kW at 400 V; when used in an inside‑delta configuration it supports ratings up to 560 kW at 400 V. The control supply for the device is 110…250 V AC and the starter uses three‑phase control with soft ramp-up and ramp-down capability plus adjustable current limitation — features that reduce mechanical shock and limit inrush current for large pumps, compressors, conveyors and other heavy industrial drives. This SKU includes an integrated bypass contactor to reduce heat loss during run and provides built‑in motor overload protection with thermistor input capability and analog output functionality for remote monitoring. The unit is supplied in an IP00 enclosure and is engineered for continuous industrial use at a rated ambient of 40 °C without derating.
Specification
Full specification
General 16
| product brand name | SIRIUS |
|---|---|
| product category | Hybrid switching devices |
| product designation | Soft starter |
| product type designation | 3RW52 |
| 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 | 3VA2580-6HN32-0AA0; Type of coordination 1, Iq = 65 kA, CLASS 10 |
| manufacturer's article number: of circuit breaker usable at 500 V | 3VA2580-6HN32-0AA0; Type of coordination 1, Iq = 65 kA, CLASS 10 |
| manufacturer's article number: of the gG fuse usable up to 690 V | 2x3NA3365-6; Type of coordination 1, Iq = 65 kA |
| manufacturer's article number: of the gG fuse usable at inside-delta circuit up to 500 V | 2x3NA3365-6; 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 | 3NE1437-2; 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 | 3NE3340-8; Type of coordination 2, Iq = 65 kA |
General technical data 49
| starting voltage [%] | 30 ... 100 % |
|---|---|
| stopping voltage [%] | 50 %; non-adjustable |
| start-up ramp 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 | 3 |
| 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 | 1 600 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) | 02/15/2018 |
| 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 Dibutylbis(pentane-2,4-dionato-O,O')tin CAS-No. 22673-19-4 |
| 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: inside-delta circuit | Yes |
| 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: firmware update | Yes |
| product function: removable terminal for control circuit | 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 31
| operational current: at 40 °C rated value | 570 A |
|---|---|
| operational current: at 50 °C rated value | 504 A |
| operational current: at 60 °C rated value | 460 A |
| operational current at inside-delta circuit: at 40 °C rated value | 987 A |
| operational current at inside-delta circuit: at 50 °C rated value | 873 A |
| operational current at inside-delta circuit: at 60 °C rated value | 796 A |
| operating voltage: rated value | 200 ... 480 V |
| operating voltage: at inside-delta circuit rated value | 200 ... 480 V |
| relative negative tolerance of the operating voltage | -15 % |
| relative positive tolerance of the operating voltage | 10 % |
| relative negative tolerance of the operating voltage at inside-delta circuit | -15 % |
| relative positive tolerance of the operating voltage at inside-delta circuit | 10 % |
| operating power for 3-phase motors: at 230 V at 40 °C rated value | 160 kW |
| operating power for 3-phase motors: at 230 V at inside-delta circuit at 40 °C rated value | 315 kW |
| operating power for 3-phase motors: at 400 V at 40 °C rated value | 315 kW |
| operating power for 3-phase motors: at 400 V at inside-delta circuit at 40 °C rated value | 560 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 | 240 A |
| adjustable motor current: minimum | 240 A |
| adjustable motor current: for inside-delta circuit at rotary coding switch on switch position 1 | 416 A |
| adjustable motor current: at inside-delta circuit minimum | 416 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 | 183 W |
| power loss [W] for rated value of the current at AC: at 50 °C after startup | 163 W |
| power loss [W] for rated value of the current at AC: at 60 °C after startup | 153 W |
| power loss [W] at AC at current limitation 350%: at 40 °C during startup | 10 241 W |
| power loss [W] at AC at current limitation 350%: at 50 °C during startup | 8 500 W |
| power loss [W] at AC at current limitation 350%: at 60 °C during startup | 7 663 W |
Show all 184 specifications ↓ Show less ↑88 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, Approvals Certificates, Logistics.
Identification 10
| Part number | 3RW5248-6AC14 |
|---|---|
| Type designation | 3RW52 |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 4047621038285 |
| 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 | 100 mA |
| inrush current by closing the bypass contacts maximum | 2.2 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 | 393 mm |
| width | 210 mm |
| depth | 203 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 | 10.6 kg |
Connections/ Terminals 12
| 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 | 45 mm |
| type of connectable conductor cross-sections: for DIN cable lug for main contacts stranded | 2x (50 ... 240 mm2) |
| type of connectable conductor cross-sections: for control circuit solid | 1x (0.5 ... 4.0 mm2), 2x (0.5 ... 2.5 mm2) |
| type of connectable conductor cross-sections: for AWG cables for control circuit solid | 1x (20 ... 12), 2x (20 ... 14) |
| wire length: between soft starter and motor maximum | 800 m |
| wire length: at the digital inputs at AC maximum | 100 m |
| tightening torque: for main contacts with screw-type terminals | 14 ... 24 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 | 124 ... 210 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 11
| of the fuse: usable for Standard Faults up to 575/600 V according to UL | Type: Class J / L, max. 1600 A; Iq = 30 kA |
|---|---|
| of the fuse: usable for High Faults up to 575/600 V according to UL | Type: Class J / L, max. 1200 A; Iq = 100 kA |
| of the fuse: usable for Standard Faults at inside-delta circuit up to 575/600 V according to UL | Type: Class J / L, max. 1600 A; Iq = 30 kA |
| of the fuse: usable for High Faults at inside-delta circuit up to 575/600 V according to UL | Type: Class J / L, max. 1200 A; Iq = 100 kA |
| operating power [hp] for 3-phase motors: at 200/208 V at 50 °C rated value | 150 hp |
| operating power [hp] for 3-phase motors: at 220/230 V at 50 °C rated value | 200 hp |
| operating power [hp] for 3-phase motors: at 460/480 V at 50 °C rated value | 400 hp |
| operating power [hp] for 3-phase motors: at 200/208 V at inside-delta circuit at 50 °C rated value | 300 hp |
| operating power [hp] for 3-phase motors: at 220/230 V at inside-delta circuit at 50 °C rated value | 350 hp |
| operating power [hp] for 3-phase motors: at 460/480 V at inside-delta circuit at 50 °C rated value | 750 hp |
| contact rating of auxiliary contacts according to UL | R300-B300 |
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 |
Approvals Certificates 1
| Environmental Product Declaration: global warming potential [CO2 eq] / during manufacturing | 84.2 kg |
|---|
Logistics 7
| Net weight | 9.899 kg |
|---|---|
| Package dimensions | 501 × 323 × 343 mm |
| Country of origin | CZ |
| Shipping weight | 10.899 kg |
| Ships from | Türkiye |
| Dispatch | 12 Nov |
| Stock | Low stock |
Source: manufacturer data · Last verified: 30 Oct 2026
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Quick answers
Questions about the 3RW52
What is the rated current of 3RW52?
The rated current of 3RW52 is 570 A.
Which supply voltage is 3RW52 rated for?
The rated operational voltage of 3RW52 is 200–480 V AC.
What motor power is 3RW52 rated for?
The rated motor power of 3RW52 is 315 kW.
Which control voltage does 3RW52 need?
The control voltage range of 3RW52 is 110–250 V.
What is the HS code of 3RW52 for customs?
The tariff (HS) code on file for 3RW52 is 853710.
What is the EAN of 3RW52?
The EAN (GTIN) of 3RW52 is 4047621038285.
Where does 3RW52 ship from, and how fast?
3RW52 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 3RW52
- Brand
- Siemens
- Series
- SIRIUS 3RW52
