{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4444-2BC44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4444-2BC44","canonicalUrl":"https://aoctrl.com/siemens/3RW4444-2BC44","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4444-2BC44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4444-2BC44 soft starter, 433 A at 40 °C, 690 V insulation voltage, 50/60 Hz, thyristor-based, inside-delta circuit, screw fixing, IP00.","salesMarkdown":"## Current rating and thermal derating — what the 433 A means in a real panel The 3RW4444-2BC44: The minimum load setting of 8 % avoids nuisance trips on lightly loaded motors or pump-off conditions — a wider adjustment range than many competitors' 10–15 % floor. ## Thyristor topology and inside-delta wiring — why it matters for high-inertia starts Built around thyristors with an inside-delta circuit, this soft starter switches only the phase legs inside the delta winding — the line current is lower than the motor full-load current, reducing cable and contactor sizing upstream. The inside-delta configuration also halves the thyristor current stress compared to a standard line-fed soft starter, making it a good fit for high-inertia loads like conveyors, crushers, and centrifuges that demand extended ramp times. ## Mounting and cable entry — panel layout constraints Dimensions are 298 mm deep, 210 mm wide, 230 mm high — fits a standard 600 mm deep enclosure with room for the main cables and bending radius. Main circuit cables accept stranded 70–240 mm² or finely stranded 50–240 mm²; the busbar connection option simplifies parallel feeds for the 433 A rating. Mounting position allows vertical surface installation with ±90° rotation and ±22.5° tilt — useful when the panel layout forces an angled or upside-down orientation. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides — the tight side clearance lets you pack multiple starters in a row.","metaTitle":"Siemens 3RW4444-2BC44 SIRIUS Soft Starter, 433 A, 690 V","metaDescription":"Siemens 3RW4444-2BC44 SIRIUS soft starter, 433 A at 40°C, 690 V insulation, 50/60 Hz. Thyristor-based with inside-delta circuit.","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":"3RW4444-2BC44","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: 250 A, 132 kW Inside-delta: 433 A, 250 kW 200-460 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5544-2HA14<<","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":"433A","at 50 °C rated value":"372A","at 60 °C rated value":"320A","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":"132kW","at standard circuit at 50 °C rated value":"150hp","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":"250kW","at inside-delta circuit at 50 °C rated value":"300hp","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":"110W","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":"50A","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/e7caf6c6f52a524991b0647d2d9d2fd7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=258805&mlfb=3RW4444-2BC44"},"ai":{"faq":[{"question":"Where can I buy the 3RW4444-2BC44 and get a price?","answer":"This soft starter is sourced to order through independent industrial distribution. Submit an RFQ — we confirm availability and current pricing against your required quantity at quote time."},{"question":"What is the 3RW4444-2BC44's depth?","answer":"The depth is 298 mm. Combined with the 210 mm width and 230 mm height, it fits a standard 600 mm deep enclosure with room for the main cable bending radius."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4444-2BC44","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/3RW4444-2BC44 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}}