{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4457-6BC35","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4457-6BC35","canonicalUrl":"https://aoctrl.com/siemens/3RW4457-6BC35","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4457-6BC35","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4457-6BC35 soft starter, 1524 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass, inside-delta circuit capable.","salesMarkdown":"## Current ratings that govern the motor load The 3RW4457-6BC35: Rated 1524 A at 40 °C, derating to 1351 A at 50 °C and 1200 A at 60 °C. The 40 °C figure is the base rating; for every degree above that, the available current drops. In a 50 °C panel ambient, budget 1351 A continuous — the 1524 A nameplate applies only at or below 40 °C. Insulation voltage rated 690 V, operating frequency 50/60 Hz. ## Integrated bypass and inside-delta wiring The integrated bypass contact system removes the thyristors from the circuit after the start completes, eliminating heat dissipation in the power section during run. This is the standard topology for soft starters above 100 A — the bypass carries the continuous current, not the silicon. Inside-delta circuit capability means the starter can be wired between the motor windings rather than in the supply lines, reducing the current through each power pole to 58% of the line current. This effectively extends the motor current range the same frame can handle — a 1524 A line-rated starter covers motors up to roughly 2600 A in inside-delta configuration. ## Protection set and overload handling Motor overload protection, intrinsic device protection, and adjustable current limitation are all onboard. The minimum load setting is 8% of the rated current — useful for light-load starts or pump soft-fill sequences where the breakaway torque is low. External reset input and a display for fault signals are standard. The display shows the fault code directly, reducing troubleshooting time on the panel door. ## Mounting and panel integration Mounting position allows vertical surface installation with +/-90° rotation and +/-22.5° tilt front-to-back. This is not a fixed-orientation device — the panel layout can rotate the unit without derating, as long as the tilt limits are respected. Dimensions: 510 mm wide, 640 mm high, 290 mm deep. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides. The side clearance is tight — adjacent devices can sit close, but the vertical airflow path needs the full 100/75 mm free space for natural convection cooling. The main current circuit connection uses busbar connection; the main cable range accepts stranded 70–240 mm², finely stranded 50–240 mm², or AWG 2/0–500 kcmil. ## Environmental and compliance Degree of pollution 3 per IEC 60947-4-2 — conductive pollution occurs, or dry non-conductive pollution that becomes conductive due to condensation. This is the standard industrial environment rating; no additional conformal coating is required for normal factory-floor conditions. Storage temperature range -25 to +80 °C; operation up to 60 °C ambient. Maximum motor cable length is 500 m — longer runs may require output reactors to manage reflected wave voltage spikes on the motor terminals.","metaTitle":"Siemens 3RW4457-6BC35 SIRIUS Soft Starter, 1524 A at 40 °C","metaDescription":"Siemens 3RW4457-6BC35 SIRIUS soft starter, 1524 A at 40 °C, 690 V insulation, integrated bypass. Active production. Quoted to order against RFQ.","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":"3RW4457-6BC35","Height":"640mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 575 V, 50 °C standard: 780 A, 850 hp Inside-delta: 1351 A, 1500 hp 400-600 V AC, 115 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5556-6HA16<<","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":"115V","at 60 Hz rated value":"115V","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":"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 ... 600V","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%","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/19311b619384469322b93d04e724e19d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=53314&mlfb=3RW4457-6BC35"},"ai":{"faq":[{"question":"What is the 3RW4457-6BC35's current rating at different temperatures?","answer":"1524 A at 40 °C, 1351 A at 50 °C, 1200 A at 60 °C. The 40 °C figure is the base rating; derate for higher ambient."},{"question":"Does the 3RW4457-6BC35 have an integrated bypass?","answer":"Yes, the integrated bypass contact system removes the thyristors from the circuit during run, eliminating heat dissipation in the power section during continuous operation."},{"question":"What compliance documentation does Siemens provide for 3RW4457-6BC35?","answer":"The device carries degree of pollution 3 per IEC 60947-4-2. Standard Siemens documentation includes the declaration of conformity and CE marking. Specific RoHS/REACH declarations are available through the Siemens Industry Online Support portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4457-6BC35","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/3RW4457-6BC35 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}}