{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4447-6BC36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4447-6BC36","canonicalUrl":"https://aoctrl.com/siemens/3RW4447-6BC36","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4447-6BC36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4447-6BC36 soft starter, 748 A at 40 °C, 690 V insulation voltage, 50/60 Hz, inside-delta circuit, thyristor-based, screw fixing, IP20, display for fault signal.","salesMarkdown":"## 748 A at 40 °C — the derating curve decides your panel budget The 3RW4447-6BC36: Above 40 °C the rating drops to 667 A at 50 °C and 580 A at 60 °C, so a hot panel or poor airflow eats capacity fast; plan the ventilation or derate the motor accordingly. Inside-delta wiring is supported, which reduces the line current the starter sees by roughly 42 % compared to standard in-line connection — useful for keeping cable sizes and contactor ratings lower on the line side. ## Mounting and panel fit — screw-fixed footprint with clearance zones It can be rotated ±90° or tilted ±22.5° front/back, giving flexibility in tight cabinets, but the derating curve assumes vertical orientation — tilting may reduce natural convection and require a further current reduction. Clearance zones: 100 mm above, 75 mm below, 5 mm at the sides. The 100 mm top clearance is the critical one — hot air rises off the heatsink, and choking that gap raises the internal temperature and triggers derating. ## Wiring and termination — busbar and lug ranges for the main circuit Main current circuit termination is busbar connection. Acceptable conductor sizes: stranded 70–240 mm², finely stranded 50–240 mm², and AWG/kcmil 2/0–500 kcmil using both clamping points. The front clamping point handles 3/0–600 kcmil; the back clamping point 250–500 kcmil. Maximum motor cable length is 500 m — sufficient for most distributed drive layouts, but long runs increase capacitive charging current and may require an output reactor if the cable exceeds the starter's internal dv/dt capability.","metaTitle":"Siemens 3RW4447-6BC36 SIRIUS Soft Starter, 748A at 40°C","metaDescription":"Siemens 3RW4447-6BC36 SIRIUS soft starter, 748A at 40°C, 690V insulation, inside-delta wiring. Current lifecycle: active.","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","title":"3RW4447-6BC36","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: 385 A, 400 hp Inside-delta: 667 A, 750 hp 400-690 V AC, 115 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5547-6HA16<<","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":"115V","at 60 Hz rated value":"115V","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":"315kW","at standard circuit at 50 °C rated value":"400hp","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":"500kW","at inside-delta circuit at 50 °C rated value":"750hp","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 ... 690V","at 690 V at standard circuit at 40 °C rated value":"400kW","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%","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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1980e5328c6652894e87cfb376044c8d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=232130&mlfb=3RW4447-6BC36"},"ai":{"faq":[{"question":"Where can I buy 3RW4447-6BC36 and get a price?","answer":"This soft starter is sourced to order through independent distribution. Submit an RFQ with your target quantity; we will confirm availability and current pricing at quote time. No stock-holding claim — every order is quoted fresh."},{"question":"What is the depth of 3RW4447-6BC36?","answer":"The depth is 298 mm, with a width of 210 mm and height of 230 mm. Allow 100 mm clearance above and 75 mm below for airflow."},{"question":"What compliance documentation does Siemens provide for 3RW4447-6BC36?","answer":"The unit carries pollution degree 3 per IEC 60947-4-2, suitable for industrial environments with conductive dust. Thyristor-based semiconductor switching means no mechanical contact wear. The insulation voltage is rated 690 V."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4447-6BC36","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/3RW4447-6BC36 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}}