{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4446-2BC35","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4446-2BC35","canonicalUrl":"https://aoctrl.com/siemens/3RW4446-2BC35","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4446-2BC35","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4446-2BC35 soft starter, 617 A at 40 °C, 690 V insulation voltage, 50/60 Hz, thyristor-based, with adjustable current limitation and motor overload protection.","salesMarkdown":"## 617 A at 40 °C — the current rating that drives the selection The 3RW4446-2BC35 is a Siemens SIRIUS soft starter rated for 617 A at a 40 °C ambient, with a 690 V insulation voltage ceiling. This is the headline current for motor starting duty — it sets the maximum motor FLA the unit can handle in a standard panel environment. Above 40 °C, the current derates to 546 A at 50 °C and 485 A at 60 °C, so enclosure cooling or a larger frame may be needed if the ambient runs hot. The unit operates on 50 or 60 Hz mains and accepts a 115 V control supply at both frequencies — no separate control transformer tap for 50 vs 60 Hz. ## Thyristor switching with adjustable current limit and inside-delta capability Thyristor-based design with adjustable current limitation means you dial in the starting current between 8% and the full rating, controlling inrush on conveyors, pumps, or compressors. Motor overload protection is integrated, so a separate overload relay is not needed in most schemes — the soft starter handles the thermal model of the motor. Inside-delta circuit support allows the soft starter to be wired in the motor's delta loop, reducing the current the unit must carry by 42% compared to standard in-line wiring. This is a common trick on larger motors to save panel space and cost, but it requires the motor leads to be brought back to the panel. ## Mounting and connection — panel layout constraints Dimensions are 230 mm high, 210 mm wide, 298 mm deep. Mounting is by screw fixing with a vertical mounting surface that can be rotated ±90° or tilted ±22.5° front/back — useful for tight enclosures or odd orientations. Clearance requirements: 100 mm upwards, 75 mm downwards, 5 mm at the sides. Main circuit connections accept stranded cable 70–240 mm², finely stranded 50–240 mm², or kcmil equivalents: 2/0–500 kcmil using both clamping points, 250–500 kcmil using the back clamping point, and 3/0–600 kcmil using the front clamping point. Busbar connection is also supported. Auxiliary contacts accept 24–16 AWG, and solid control wires 0.25–1.5 mm².","metaTitle":"Siemens 3RW4446-2BC35 SIRIUS Soft Starter, 617A","metaDescription":"Siemens 3RW4446-2BC35 SIRIUS soft starter, rated 617A at 40°C, 690V insulation voltage, 50/60 Hz. Active production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"298mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"210mm","title":"3RW4446-2BC35","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 400-600 V AC, 115 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5546-2HA16<<","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":"617A","at 50 °C rated value":"546A","at 60 °C rated value":"485A","For Auxiliary Contacts":"2x (24 ... 16)","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":"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":"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 ... 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%","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/49282bccc9f6ecbfe5f96bc46d751766.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=515083&mlfb=3RW4446-2BC35"},"ai":{"faq":[{"question":"What is the rated current of the 3RW4446-2BC35 at different temperatures?","answer":"At 40 °C the unit is rated for 617 A. This derates to 546 A at 50 °C and 485 A at 60 °C. The derating temperature threshold is 40 °C — above that, the current must be reduced per the derating curve."},{"question":"What compliance documentation does Siemens provide for the 3RW4446-2BC35?","answer":"The soft starter is designed to IEC 60947-4-2 (degree of pollution 3) and carries a 690 V insulation voltage rating. Standard Siemens documentation includes the CE declaration of conformity and the product manual. Specific RoHS and REACH compliance statements are available in the manufacturer's documentation package."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4446-2BC35","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/3RW4446-2BC35 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}}