{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4447-6BC44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4447-6BC44","canonicalUrl":"https://aoctrl.com/siemens/3RW4447-6BC44","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4447-6BC44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS soft starter, 3RW4447-6BC44, 748 A at 40 °C, 690 V insulation voltage, thyristor-based, motor overload protection, adjustable current limitation.","salesMarkdown":"## What this SIRIUS soft starter delivers The Siemens 3RW4447-6BC44 is a SIRIUS-brand soft starter rated 748 A at 40 °C, derating to 667 A at 50 °C and 580 A at 60 °C. At 690 V insulation voltage and 50/60 Hz, it uses thyristors to ramp motor voltage, with adjustable current limitation and integrated motor overload protection. The 8% minimum load setting means it can handle lightly loaded motors without dropping out — useful for pumps or conveyors that start near-empty. Fastened by screw fixing to a vertical mounting surface, the unit is rotatable ±90° and tiltable ±22.5° front-to-back. Clearance requirements: 100 mm upwards, 75 mm downwards, 5 mm at the sides. Main current circuit uses busbar connection; main contact wire range is 2/0 to 500 kcmil, with both clamping points accepting 2x 2/0 to 2x 500 kcmil. Stranded cable: 70–240 mm²; finely stranded: 50–240 mm². Auxiliary contacts accept 2x (0.5–2.5 mm²) solid or 2x (20–14) AWG. Max wire length to motor: 500 m. Pollution degree 3 per IEC 60947-4-2 — suitable for industrial enclosures with conductive dust. ## Inside-delta circuit and external reset Supports inside-delta circuit wiring, which reduces the current through the soft starter to 58% of line current — useful for larger motors where the starter's amp rating becomes the constraint. External reset input allows remote fault recovery without opening the panel door. Fault signal shown on the built-in display. Intrinsic device protection guards the thyristors against over-temperature and short-duration overcurrent.","metaTitle":"Siemens 3RW4447-6BC44 SIRIUS Soft Starter, 748A at 40°C","metaDescription":"Siemens SIRIUS soft starter 3RW4447-6BC44, rated 748A at 40°C, 690V insulation voltage, thyristor-based, motor overload protection, adjustable current limitation, current productio","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"298mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"210mm","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","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":"748A","at 50 °C rated value":"667A","at 60 °C rated value":"580A","For Auxiliary Contacts":"2x (20 ... 14)","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":"screw-type 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 (0.5 ... 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":"400kW","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":"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%","For Auxiliary Contacts Finely Stranded With Core End Processing":"2x (20 ... 16)","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":"232W","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":"86A","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":"$5,186.00 – $13,501.37","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=342196&mlfb=3RW4447-6BC44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RW4447-6BC44/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RW4447-6BC44?","answer":"Submit an RFQ — the part is sourced to order through independent distribution, with availability and current pricing confirmed at quote time."},{"question":"Will 3RW4447-6BC44 drop into a panel specified around 3RT5076-6AP36 without rewiring?","answer":"No — the 3RT5076-6AP36 is a contactor, not a soft starter. The 3RW4447-6BC44 has different dimensions (210 mm wide, 230 mm high, 298 mm deep), requires busbar connections for the main circuit, and needs specific clearances (100 mm up, 75 mm down, 5 mm sides). Panel rework and rewiring would be required."},{"question":"What compliance documentation does Siemens provide for 3RW4447-6BC44?","answer":"The part is designed to IEC 60947-4-2 (pollution degree 3). Standard Siemens documentation includes the datasheet, operating instructions, and CE declaration of conformity. Specific RoHS/REACH declarations are available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4447-6BC44","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/3RW4447-6BC44 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}