{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4457-6BC44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4457-6BC44","canonicalUrl":"https://aoctrl.com/siemens/3RW4457-6BC44","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4457-6BC44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4457-6BC44 soft starter, thyristor-based, 1524 A at 40 °C, integrated bypass, 690 V insulation, 50/60 Hz.","salesMarkdown":"The Siemens 3RW4457-6BC44 is a SIRIUS soft starter rated 1524 A at 40 °C, derating to 1351 A at 50 °C and 1200 A at 60 °C. That 1524 A figure is the current it can handle continuously through the thyristor stack at a 40 °C ambient — above that, you need to derate by roughly 10 A per degree. The integrated bypass contact system means the thyristors are shorted out once the motor is up to speed, so the bypass contactors carry the full load current and the thyristors only see the start transient. This keeps the thermal stress on the thyristors low and extends service life in high-duty-cycle applications. Insulation voltage is rated 690 V, operating frequency 50 to 60 Hz. Motor overload protection is built in, and adjustable current limitation sets start current from 8% to full rated current. The inside-delta circuit configuration is worth noting: this starter can be wired in the delta legs of a six-lead motor, which reduces the current the starter sees to 58% of the line current. That means a 1524 A starter in inside-delta can handle a motor with a line current up to about 2628 A — a significant cost saving on larger drives. The external reset and display for fault signals simplify troubleshooting on the line. Fastening is screw fixing. The main current circuit connects via busbar; auxiliary and control circuits use screw-type terminals accepting 2x (0.5 to 2.5 mm²) solid or 2x (20 to 14 AWG) for auxiliary contacts. Power wiring accepts stranded 70 to 240 mm² or finely stranded 50 to 240 mm², and for North American practice, 2/0 to 500 kcmil. Dimensions: 640 mm height, 510 mm width, 290 mm depth. Clearance requirements: 100 mm upwards, 75 mm downwards, 5 mm at the sides. The wire length maximum of 500 m from starter to motor should be respected to avoid voltage drop issues during the start ramp. Storage temperature range -25 to +80 °C; during operation the ambient limit is 60 °C with derating starting at 40 °C. The product component includes a motor brake output, which is useful for applications requiring controlled stopping.","metaTitle":"Siemens 3RW4457-6BC44 SIRIUS Soft Starter, 1524 A","metaDescription":"Siemens 3RW4457-6BC44 SIRIUS soft starter, rated 1524 A at 40°C. Thyristor-based with integrated bypass. Active production. Sourced to order — request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"290mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"510mm","title":"3RW4457-6BC44","Height":"640mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 400 V, 40 °C standard: 880 A, 500 kW Inside-delta: 1524 A, 900 kW 200-460 V AC, 230 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5556-6HA14<<","During Storage":"-25 ... +80°C","External Reset":"Yes","Finely Stranded":"50 ... 240 mm²","lifecycle_stage":"current","During Operation":"60°C","Fastening Method":"screw fixing","Minimum Load [%]":"8%","For Main Contacts":"2/0 ... 500 kcmil","Mounting Position":"with vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back","Product Brand Name":"SIRIUS","Degree Of Pollution":"3, acc. to IEC 60947-4-2","Product Designation":"Soft starter","Wire Length Maximum":"500m","Derating Temperature":"40°C","Inside-Delta Circuit":"Yes","at 50 Hz rated value":"230V","at 60 Hz rated value":"230V","at 40 °C rated value":"1 524A","at 50 °C rated value":"1 351A","at 60 °C rated value":"1 200A","For Auxiliary Contacts":"2x (20 ... 14)","For Main Current Circuit":"busbar connection","Motor Overload Protection":"Yes","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Insulation Voltage Rated Value":"690V","Operating Frequency Rated Value":"50 ... 60Hz","Display Version For Fault Signal":"Display","Integrated Bypass Contact System":"Yes","For Auxiliary And Control Circuit":"screw-type terminals","Product Component Motor Brake Output":"Yes","during storage according to IEC 60721":"1K6 (only occasional condensation), 1C2 (no salt mist), 1S2 (sand must not get inside the devices), 1M4","reference code according to EN 61346-2":"Q","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","during transport according to IEC 60721":"2K2, 2C1, 2S1, 2M2 (max. fall height 0.3 m)","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Evaluation Of Thermistor Motor Protection":"Yes","at standard circuit at 40 °C rated value":"500kW","at standard circuit at 50 °C rated value":"700hp","number of CO contacts for auxiliary contacts":"1","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"3","Type Of Voltage Of The Control Supply Voltage":"AC","at inside-delta circuit at 40 °C rated value":"900kW","at inside-delta circuit at 50 °C rated value":"1 200hp","Control Supply Voltage Frequency 1 Rated Value":"50Hz","Control Supply Voltage Frequency 2 Rated Value":"60Hz","Installation Altitude At Height Above Sea Level":"5 000m","continuous operating current [% of Ie] at 40 °C":"115%","Operating Voltage At Standard Circuit Rated Value":"200 ... 460V","contact rating of auxiliary contacts according to UL":"B300 / R300","Operating Voltage At Inside-Delta Circuit Rated Value":"200 ... 460V","Relative Negative Tolerance Of The Operating Frequency":"-10%","Relative Positive Tolerance Of The Operating Frequency":"10%","For Auxiliary Contacts Finely Stranded With Core End Processing":"2x (20 ... 16)","Relative Negative Tolerance Of The Control Supply Voltage Frequency":"-10%","Relative Positive Tolerance Of The Control Supply Voltage Frequency":"10%","Relative Negative Tolerance Of The Operating Voltage At Standard Circuit":"-15%","Relative Positive Tolerance Of The Operating Voltage At Standard Circuit":"10%","power loss [W] at operational current at 40 °C during operation typical":"250W","relative negative tolerance of the control supply voltage at AC at 50 Hz":"-15%","relative negative tolerance of the control supply voltage at AC at 60 Hz":"-15%","relative positive tolerance of the control supply voltage at AC at 50 Hz":"10%","relative positive tolerance of the control supply voltage at AC at 60 Hz":"10%","Adjustable Motor Current For Motor Overload Protection Minimum Rated Value":"176A","Relative Negative Tolerance Of The Operating Voltage At Inside-Delta Circuit":"-15%","Relative Positive Tolerance Of The Operating Voltage At Inside-Delta Circuit":"10%"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4f9947d2d77bbdb4fd3a08a5a1d402a6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=527878&mlfb=3RW4457-6BC44"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4457-6BC44","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RW4457-6BC44 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}