{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4446-2BC45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4446-2BC45","canonicalUrl":"https://aoctrl.com/siemens/3RW4446-2BC45","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4446-2BC45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4446-2BC45 soft starter, thyristor-based, 617 A at 40 °C, 690 V insulation, 50/60 Hz, inside-delta circuit, screw fixing, 298 mm depth.","salesMarkdown":"## 617 A at 40 °C — the motor-starting current that drives the selection The 3RW4446-2BC45 is a SIRIUS-branded soft starter rated 617 A at 40 °C ambient. For a motor with a 500 A FLA, this unit gives headroom without oversizing the cabinet. Inside-delta wiring reduces the line current by about 42 % compared to standard-in-line connection — a 617 A unit in inside-delta mode handles the equivalent of a 1050 A motor FLA. That matters when the existing feeder cables or MCC busbars are the constraint. ## Terminal sizing and busbar connection — what lands on the lugs Main circuit terminals accept stranded 70–240 mm² or finely stranded 50–240 mm², plus AWG 2/0–500 kcmil for the main contacts. The busbar connection is standard for this current class — expect flat copper bars, not cable lugs, in the panel layout. The rear clamping point takes 250–500 kcmil; the front takes 3/0–600 kcmil. The screw fixing means no DIN-rail clip — the unit bolts directly to the backplate, so pre-drill the mounting holes to the 210 mm width and 230 mm height footprint. ## Active production — no lifecycle surprises The lifecycle stage is current — Siemens still manufactures this order code. For BOM planning, this part is a standard catalog item; the supply channel is the normal Siemens distribution network. Pollution degree 3 per IEC 60947-4-2 means the soft starter is rated for conductive dust and occasional condensation — typical for motor control centres in mills, plants, and pump houses.","metaTitle":"Siemens 3RW4446-2BC45 Soft Starter, 617 A, 690 V, SIRIUS","metaDescription":"Siemens 3RW4446-2BC45 SIRIUS soft starter, 617 A at 40 °C, 690 V insulation, thyristor-based, inside-delta capable. 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":"3RW4446-2BC45","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 500 V, 40 °C standard: 356 A, 250 kW Inside-delta: 617 A, 450 kW 400-600 V AC, 230 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":"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":"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/6dd21011423e4607ad6e3d2f2f8dc46b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=481881&mlfb=3RW4446-2BC45"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RW4446-2BC45?","answer":"This unit is sourced through independent distribution channels — submit a request with your target quantity and delivery window, and we will return a firm quote with availability."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4446-2BC45","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/3RW4446-2BC45 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}}