{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4446-2BC44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4446-2BC44","canonicalUrl":"https://aoctrl.com/siemens/3RW4446-2BC44","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4446-2BC44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4446-2BC44 soft starter, 617 A at 40 °C, 230 V AC, 50/60 Hz, thyristor-based, inside-delta circuit, screw fixing, 298 x 210 x 230 mm.","salesMarkdown":"## Current rating and thermal derating The 3RW4446-2BC44: The thyristor-based output handles the full motor start cycle without mechanical contacts, and the inside-delta wiring option reduces line current by 58 % compared to standard in-line connection — useful for retrofitting into existing cable runs without upsizing the supply feeder. Minimum load is 8 % of the rated current — below that the soft starter may not trigger reliably, so confirm the motor magnetising current exceeds this floor before committing the BOM line. ## Mounting, clearance, and wiring constraints Envelope is 298 mm deep, 210 mm wide, 230 mm high — screw-fixing to the back panel, not DIN-rail snap-on, so factor in drill-and-tap or through-hole mounting during panel layout. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides — the vertical gap is the main space driver; stacking multiple units in a row needs the full 100 mm top clearance for airflow and service access. Main circuit connection is busbar only — no cable lugs on the power terminals. Stranded cable range is 70 to 240 mm² (or 2/0 to 500 kcmil using both clamping points), with the front clamp accepting up to 600 kcmil and the back clamp 250 to 500 kcmil. Mounting position is flexible: vertical surface with ±90° rotation and ±22.5° tilt forward/backward — useful for tight enclosures where the unit must be angled to clear gland plates or busbars. ## Protection, control, and environment Motor overload protection and intrinsic device protection are built in — no separate overload relay needed for the soft starter itself. Adjustable current limitation lets you set the start current between the minimum load threshold and the unit's full rating. External reset input and a fault-signal display (text/graphic, not just LEDs) simplify remote diagnostics — the display shows the fault code directly, which speeds troubleshooting on a line-down call. Operating temperature limit is 60 °C during operation; storage range is -25 to +80 °C. The derating temperature threshold is 40 °C — above that, use the derating curves in the manual, not the nameplate rating.","metaTitle":"Siemens 3RW4446-2BC44 SIRIUS Soft Starter, 617A, 230V","metaDescription":"Siemens SIRIUS 3RW4446-2BC44 soft starter, 617A at 40°C, 230V AC, 50/60Hz. Active production, thyristor-based with inside-delta wiring. 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":"3RW4446-2BC44","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 400 V, 40 °C standard: 356 A, 200 kW Inside-delta: 617 A, 355 kW 200-460 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5546-2HA14<<","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":"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":"200kW","at standard circuit at 50 °C rated value":"250hp","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":"355kW","at inside-delta circuit at 50 °C rated value":"450hp","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":"200 ... 460V","contact rating of auxiliary contacts according to UL":"B300 / R300","Operating Voltage At Inside-Delta Circuit Rated Value":"200 ... 460V","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/71144634471b055ed72a38f6b24889fa.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=287917&mlfb=3RW4446-2BC44"},"ai":{"faq":[{"question":"What is the current rating of 3RW4446-2BC44 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 reference; above that, expect roughly 12 % reduction per 10 °C rise."},{"question":"What clearance is needed around the 3RW4446-2BC44 in a panel?","answer":"100 mm above, 75 mm below, and 5 mm at the sides. The vertical clearance is the critical dimension for airflow and service access."},{"question":"Does 3RW4446-2BC44 support inside-delta wiring?","answer":"Yes, the unit supports inside-delta circuit connection, which reduces line current by approximately 58 % compared to standard in-line wiring — useful when the supply cable is already sized for a lower current."},{"question":"What compliance documentation is available for 3RW4446-2BC44?","answer":"The soft starter is designed to IEC 60947-4-2 (pollution degree 3). Standard Siemens documentation includes CE declaration of conformity and the product manual with installation, wiring, and parameterisation instructions. RoHS and REACH compliance is standard for current-production SIRIUS devices."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4446-2BC44","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/3RW4446-2BC44 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}}