{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4444-2BC35","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4444-2BC35","canonicalUrl":"https://aoctrl.com/siemens/3RW4444-2BC35","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4444-2BC35","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4444-2BC35 soft starter, 433 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass, inside-delta circuit, screw fixing.","salesMarkdown":"## 433 A at 40 °C — where the rating holds and where it derates The 3RW4444-2BC35: Insulation voltage is rated 690 V, operating frequency is 50/60 Hz, and pollution degree 3 per IEC 60947-4-2 — this is standard for industrial motor control panels where conductive dust or humidity is present. ## Integrated bypass and inside-delta wiring An integrated bypass contact system means the thyristors are shorted out once the motor is up to speed — no external bypass contactor needed, and the heat load in the panel drops to near zero during run. Inside-delta circuit wiring is supported, which lets you connect the soft starter in the motor delta legs rather than the supply lines — this reduces the current the soft starter sees by roughly 42% compared to standard in-line wiring, so a smaller unit can handle the same motor. Adjustable current limitation lets you set the start current between 8% minimum load and the full rated current, giving you control over the inrush on the supply and the mechanical shock to the load. ## Panel fit and termination Mounting is screw fixing with a vertical mounting surface — the unit can be rotated ±90° or tilted ±22.5° front/back. Envelope is 230 mm high, 210 mm wide, 298 mm deep. Main circuit termination accepts busbar connection or cable — stranded 70 to 240 mm², finely stranded 50 to 240 mm², or AWG 2/0 to 500 kcmil. Control wiring is 2x 0.25 to 1.5 mm² solid. Clearance distances: 100 mm upwards, 75 mm downwards, 5 mm at the side. Wire length to the motor is max 500 m — long cable runs increase capacitive charging current and may cause nuisance trips on the soft starter's internal protection.","metaTitle":"Siemens 3RW4444-2BC35 SIRIUS Soft Starter, 433 A, 690 V","metaDescription":"Siemens 3RW4444-2BC35 SIRIUS soft starter, 433 A at 40 °C, 690 V insulation. Integrated bypass, adjustable current limit, inside-delta capable.","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":"3RW4444-2BC35","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: 215 A, 200 hp Inside-delta: 372 A, 350 hp 400-600 V AC, 115 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5544-2HA16<<","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%","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":"433A","at 50 °C rated value":"372A","at 60 °C rated value":"320A","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 AWG cables for main contacts":"2/0 ... 500 kcmil","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","for AWG cables for auxiliary contacts":"2x (24 ... 16)","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":"160kW","at standard circuit at 50 °C rated value":"200hp","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":"315kW","at inside-delta circuit at 50 °C rated value":"350hp","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":"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/2bbcd93bc1760af31ed80e9532a42b12.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=538556&mlfb=3RW4444-2BC35"},"ai":{"faq":[{"question":"What is 3RW4444-2BC35's listed depth?","answer":"The depth is 298 mm. Overall envelope is 230 mm high by 210 mm wide."},{"question":"What compliance documentation does Siemens provide for 3RW4444-2BC35?","answer":"The soft starter is rated pollution degree 3 per IEC 60947-4-2 and carries a 690 V insulation voltage rating. Standard Siemens documentation includes the declaration of conformity for the applicable EU directives; specific certificates (UL, CSA, CE, UKCA, EAC) should be confirmed at RFQ against the target installation jurisdiction."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4444-2BC35","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/3RW4444-2BC35 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}}