{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4457-2BC46","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4457-2BC46","canonicalUrl":"https://aoctrl.com/siemens/3RW4457-2BC46","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4457-2BC46","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4457-2BC46 soft starter, 1524 A at 40 °C, 690 V insulation voltage, integrated bypass contact system, inside-delta circuit, screw fixing, 640 x 510 x 290 mm.","salesMarkdown":"## Rated current and thermal derating — the real continuous-duty limit The 3RW4457-2BC46: The headline rating is 1524 A at 40 °C ambient. For a panel builder sizing this into a 50 °C enclosure, the usable current is 1351 A — not the 40 °C figure. The derating temperature threshold is 40 °C, meaning above that ambient the output must be reduced per the curve. Insulation voltage is rated 690 V, covering 400/480/575 V systems with margin. Pollution degree 3 per IEC 60947-4-2 means the unit is designed for industrial environments with conductive dust or condensation — not for clean-room or climate-controlled spaces. Operating frequency is 50/60 Hz dual-rated, so the same unit works on 50 Hz or 60 Hz supplies without a hardware change. Control supply voltage is 230 V at either frequency. ## Integrated bypass and inside-delta wiring An integrated bypass contact system is built in — no external bypass contactor needed. This saves panel space, reduces wiring, and eliminates the heat load of a separate contactor coil. The thyristors are only in circuit during the start/stop ramp; the bypass carries the full load current in steady state. Inside-delta circuit wiring is supported. In an inside-delta configuration, the soft starter connects to the motor windings in a delta arrangement, reducing the current through each thyristor leg by a factor of √3 compared to standard in-line wiring. This is useful for large motors where the starter current rating would otherwise need to be oversized. ## Protection features and motor brake output Motor overload protection is built in, along with intrinsic device protection (over-temperature, phase loss, etc.). The adjustable current limitation lets you set the start current as a percentage of the motor FLA — the minimum load is 8% of the rated current, so it handles lightly loaded starts. A motor brake output is included as a product component. This is a relay output that can control an external DC injection brake or mechanical brake coil, common on hoist, crane, or conveyor applications where the load must hold after the motor stops. The fault signal is displayed on an onboard display — no separate HMI or panel indicator needed for basic fault diagnosis. External reset is supported for remote restart. ## Mounting, dimensions, and termination Dimensions are 640 mm height, 510 mm width, 290 mm depth. Fastening is by screw fixing — no DIN-rail clip. Mounting position allows vertical surface with +/-90° rotation and +/-22.5° tilt front/back, giving flexibility in panel layout. Main circuit connection is via busbar (not cable lugs), with wire sizes from 2/0 to 500 kcmil or 70 to 240 mm² stranded. The control terminals are separate from the power circuit, reducing the chance of wiring errors. Maximum motor cable length is 500 m. For long cable runs, consider the cable capacitance and potential reflected-wave issues — this is a soft starter, not a VFD, so dV/dt is lower, but runs near the limit should be checked against the motor insulation rating. Clearance requirements: 100 mm upwards, 75 mm downwards, 5 mm at the sides. Storage temperature range is -25 to +80 °C; operating ambient max is 60 °C. ## Sourcing — quoted to order, active production This 3RW4457-2BC46 is sourced through authorized distribution channels. No stock-holding claim is made; each order is quoted individually.","metaTitle":"Siemens 3RW4457-2BC46 SIRIUS Soft Starter, 1524 A, 690 V","metaDescription":"Siemens 3RW4457-2BC46 SIRIUS soft starter, rated 1524 A at 40 °C, 690 V insulation. Active production, integrated bypass, inside-delta capable. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"290mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"510mm","title":"3RW4457-2BC46","Height":"640mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 690 V, 40 °C standard: 880 A, 900 kW Inside-delta: only up to 600 V 400-690 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5556-2HA16<<","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 (24 ... 16)","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":"spring-loaded 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 (0.25 ... 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":"630kW","at standard circuit at 50 °C rated value":"850hp","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":"1 000kW","at inside-delta circuit at 50 °C rated value":"1 500hp","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":"400 ... 690V","at 690 V at standard circuit at 40 °C rated value":"900kW","contact rating of auxiliary contacts according to UL":"B300 / R300","Operating Voltage At Inside-Delta Circuit Rated Value":"400 ... 600V","Relative Negative Tolerance Of The Operating Frequency":"-10%","Relative Positive Tolerance Of The Operating Frequency":"10%","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/eb45292a119df7d4d4ff23603e5885f8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=528643&mlfb=3RW4457-2BC46"},"ai":{"faq":[{"question":"What is the continuous current rating of 3RW4457-2BC46 at 50 °C?","answer":"At 50 °C ambient, the continuous rated current is 1351 A. At 40 °C it is 1524 A, and at 60 °C it derates to 1200 A. The derating temperature threshold is 40 °C."},{"question":"Does 3RW4457-2BC46 support inside-delta wiring?","answer":"Yes, inside-delta circuit is supported. This wiring topology reduces the current through each thyristor leg, allowing the soft starter to handle a larger motor than its in-line rating would suggest."},{"question":"What is the physical size of 3RW4457-2BC46?","answer":"Dimensions are 640 mm height, 510 mm width, 290 mm depth. Mounting is by screw fixing, not DIN rail. Clearance required: 100 mm above, 75 mm below, 5 mm at sides."},{"question":"Does 3RW4457-2BC46 have an integrated bypass contactor?","answer":"Yes, an integrated bypass contact system is built in. No external bypass contactor is needed. The thyristors only conduct during the start/stop ramp; the bypass carries the steady-state load current."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4457-2BC46","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/3RW4457-2BC46 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}}