{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4457-2BC36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4457-2BC36","canonicalUrl":"https://aoctrl.com/siemens/3RW4457-2BC36","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4457-2BC36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4457-2BC36 soft starter, 1524 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass, inside-delta circuit, screw fixing, busbar connection.","salesMarkdown":"## Current derating — the real operating envelope The 3RW4457-2BC36: Rated 1524 A at 40 °C, derated to 1351 A at 50 °C, and 1200 A at 60 °C. The 324 A drop between 40 °C and 60 °C means panel ambient temperature directly governs the usable motor FLA. If the enclosure runs at 50 °C, budget 1351 A as the ceiling — not the 40 °C figure. Derating temperature threshold is 40 °C; above that the current must be reduced per the datasheet curve. The 690 V rated insulation voltage (IEC 60947-4-2) and pollution degree 3 environment suit industrial panels with conductive dust or humidity. ## Inside-delta wiring and integrated bypass Supports inside-delta circuit configuration — the thyristors are wired inside the motor delta connection, reducing the current through each device to 58% of the line current. This lets a 1524 A unit handle motors with a higher locked-rotor current than a standard line-connected soft starter of the same rating. Integrated bypass contact system means the thyristors are shorted out after the start ramp, eliminating continuous conduction losses. The bypass contactor is built into the unit — no external bypass contactor or wiring needed. ## Terminal sizing and panel fit Main circuit connection is busbar only — no cable lugs. The busbar interface accepts 2/0 to 500 kcmil conductors. Stranded power wiring is 70–240 mm²; finely stranded 50–240 mm². Mounting is screw fixing with a vertical mounting surface. The unit can be rotated ±90° or tilted ±22.5° forward/backward. Dimensions are 640 mm high, 510 mm wide, 290 mm deep — plan the gland plate and busbar clearance accordingly. Minimum clearance: 100 mm upward, 75 mm downward, 5 mm at the sides. ## Protection and control features Built-in motor overload protection and intrinsic device protection (thyristor overtemperature, phase imbalance, etc.). Adjustable current limitation lets you set the start current between 8% and the rated current. External reset input allows remote fault clearing. Display for fault signals on the unit. Includes a motor brake output component — the unit can control a DC injection brake or mechanical brake coil directly. Maximum motor cable length is 500 m.","metaTitle":"Siemens 3RW4457-2BC36 SIRIUS Soft Starter, 1524 A, 690 V","metaDescription":"Siemens 3RW4457-2BC36 SIRIUS soft starter, 1524 A at 40 °C, 690 V insulation, integrated bypass, inside-delta circuit. Active production, 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":"3RW4457-2BC36","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 400-690 V AC, 115 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":"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 (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/c46c265755f1d61468a1cb690111451f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=22135&mlfb=3RW4457-2BC36"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for 3RW4457-2BC36?","answer":"The unit carries IEC 60947-4-2 certification for pollution degree 3. Standard Siemens documentation includes the declaration of conformity for CE/UKCA, RoHS, and REACH compliance — available on request with the order."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4457-2BC36","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/3RW4457-2BC36 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}}