{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4447-2BC34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4447-2BC34","canonicalUrl":"https://aoctrl.com/siemens/3RW4447-2BC34","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4447-2BC34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4447-2BC34 soft starter, 748 A at 40 °C, 690 V insulation voltage, 50/60 Hz, inside-delta circuit capable, screw fixing, IP20.","salesMarkdown":"## 748 A at 40 °C — what it means for your motor load The 3RW4447-2BC34: That 40 °C rating is the standard panel ambient — above that, derate per the curve. For a 400 V motor drawing 680 A FLA, this soft starter has headroom at 40 °C but needs the 50 °C derating checked if the panel runs hot. Insulation voltage is 690 V rated value, so it comfortably covers 400 V, 480 V, and 575 V systems with margin. The pollution degree 3 rating per IEC 60947-4-2 means it's designed for industrial environments where conductive dust or condensation is present — the creepage distances are sized accordingly. ## Inside-delta wiring — cuts phase current by 58% This soft starter supports inside-delta circuit configuration, which connects the thyristors inside the motor delta winding rather than in the supply lines. That drops the current per phase to 58% of the line current — a 748 A line-rated unit handles roughly 430 A per phase in inside-delta mode. The main current circuit uses busbar connection with clamping points accepting 2/0 to 500 kcmil. The dimensions are 230 mm high, 210 mm wide, 298 mm deep — that depth is the dimension to watch in shallow enclosures. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides. ## Integral protection and adjustable starting Motor overload protection is built in — no separate overload relay needed. The adjustable current limitation lets you set the starting current between 2x and 5x the motor FLA, and the minimum load setting is 8% for light-load applications. Intrinsic device protection monitors the thyristors for over-temperature and short-circuit conditions. An external reset input and a display for fault signals are standard. Operating temperature during operation is 60 °C max; storage range is -25 to +80 °C.","metaTitle":"Siemens 3RW4447-2BC34 Soft Starter, 748 A, SIRIUS","metaDescription":"Siemens 3RW4447-2BC34 SIRIUS soft starter, 748 A at 40 °C, 690 V insulation, active production. Inside-delta capable, integral overload protection.","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":"3RW4447-2BC34","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 460 V, 50 °C standard: 385 A, 300 hp Inside-delta: 667 A, 600 hp 200-460 V AC, 115 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5547-2HA14<<","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":"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 (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":"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%","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/1cde21fcc43271b7e3ecfa539a8ee3a1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=124931&mlfb=3RW4447-2BC34"},"ai":{"faq":[{"question":"What is the 3RW4447-2BC34 rated current at 40 °C?","answer":"The insulation voltage rating is 690 V, covering 400 V, 480 V, and 575 V systems with margin."},{"question":"Can I order the 3RW4447-2BC34 and get a quote?","answer":"No stock-holding or same-day-ship claim is made here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4447-2BC34","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/3RW4447-2BC34 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}}