{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4446-6BC36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4446-6BC36","canonicalUrl":"https://aoctrl.com/siemens/3RW4446-6BC36","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4446-6BC36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4446-6BC36 soft starter, 617 A at 40 °C, 690 V insulation voltage, 50/60 Hz, thyristor-based, inside-delta circuit capable, screw fixing.","salesMarkdown":"## 617 A at 40 °C — the rating that matters for motor starting The 3RW4446-6BC36: That 40 °C figure is the baseline for sizing — if your panel ambient runs hotter, the continuous current drops by about 12 % per 10 °C rise, so a motor pulling 500 A FLA needs the 50 °C column, not the 40 °C one. Insulation voltage is rated 690 V, operating frequency 50/60 Hz. The thyristor-based switching handles the inrush without mechanical contact wear — the soft starter ramps voltage to the motor, not slamming contacts closed. ## Inside-delta wiring and main circuit connections This unit supports inside-delta circuit configuration, which lets you wire the soft starter inside the motor delta connection — reduces the current the soft starter sees by a factor of √3 compared to in-line wiring. That means a 617 A rated unit can handle a motor with a line current up to about 1070 A when wired inside-delta, assuming the motor windings are accessible. Main circuit termination accepts stranded 70–240 mm², finely stranded 50–240 mm², or busbar connection. For North American builds, the clamping points accept 2/0–500 kcmil using both points, with the front point handling 3/0–600 kcmil and the back point 250–500 kcmil. That covers everything from a 200 A feeder to a 600 A motor circuit without adapters. ## Mounting and panel fit — 298 mm deep, screw-fixed Dimensions are 298 mm deep, 210 mm wide, 230 mm high. Mounting position allows vertical surface with ±90° rotation and ±22.5° tilt front/back, giving flexibility in tight enclosures. Clearance requirements: 100 mm upwards, 75 mm downwards, 5 mm at the sides. The 5 mm side gap is tight — adjacent devices or cable ducts need to stay clear of the heatsink fins. ## Active production — sourcing reality Sourced through independent distribution channels. No stock-holding claim — quoted to order per RFQ.","metaTitle":"Siemens 3RW4446-6BC36 SIRIUS Soft Starter, 617 A at 40 °C","metaDescription":"Siemens 3RW4446-6BC36 SIRIUS soft starter, 617 A at 40 °C, 690 V insulation, 50/60 Hz. Active production, quoted to order. Inside-delta circuit capable.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"298mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"210mm","title":"3RW4446-6BC36","Height":"230mm","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: 315 A, 300 hp Inside-delta: 546 A, 600 hp 400-690 V AC, 115 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5546-6HA16<<","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":"617A","at 50 °C rated value":"546A","at 60 °C rated value":"485A","For Auxiliary Contacts":"2x (20 ... 14)","For Main Current Circuit":"busbar connection","Motor Overload Protection":"Yes","Using Both Clamping Points":"min. 2x 2/0, max. 2x 500 kcmil","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Using The Back Clamping Point":"250 ... 500 kcmil","Insulation Voltage Rated Value":"690V","Using The Front Clamping Point":"3/0 ... 600 kcmil","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":"250kW","at standard circuit at 50 °C rated value":"300hp","Finely Stranded Without Core End Processing":"min. 2x 50 mm², max. 2x 185 mm²","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":"450kW","at inside-delta circuit at 50 °C rated value":"600hp","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":"355kW","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":"174W","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":"71A","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/e7aceba53aa92fe28d3a29cfe4cdf11a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=526982&mlfb=3RW4446-6BC36"},"ai":{"faq":[{"question":"What current can the 3RW4446-6BC36 handle at different ambient temperatures?","answer":"Rated 617 A at 40 °C, derated to 546 A at 50 °C, and 485 A at 60 °C. The 40 °C figure is the baseline for sizing; for higher ambient panels, use the derated column."},{"question":"Does the 3RW4446-6BC36 support inside-delta wiring?","answer":"Yes, inside-delta circuit configuration is supported. This allows the soft starter to handle a motor line current up to about √3 times its rated current when wired inside the motor delta."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4446-6BC36","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/3RW4446-6BC36 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}