{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4443-6BC44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4443-6BC44","canonicalUrl":"https://aoctrl.com/siemens/3RW4443-6BC44","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4443-6BC44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS soft starter, 3RW4443-6BC44, rated 352 A at 40 °C (312 A at 50 °C, 270 A at 60 °C), 690 V insulation voltage, 50-60 Hz, 230 V control supply.","salesMarkdown":"The Siemens 3RW4443-6BC44 is a SIRIUS soft starter rated for 352 A at 40 °C, with a 690 V insulation voltage and a 230 V control supply at 50-60 Hz. This is the full-load current capability for a 3-phase induction motor start; the unit can handle 312 A at 50 °C and 270 A at 60 °C, so the operating ambient directly sets the maximum motor FLA you can protect. ## Wiring and protection details Main circuit wiring accepts stranded copper from 70 to 240 mm² (AWG 2/0 to 500 kcmil using both clamping points; 250-500 kcmil via the back point, 3/0-600 kcmil via the front point). Solid wire for auxiliary contacts is 0.5-2.5 mm² (20-14 AWG). Motor overload protection and intrinsic device protection are built in, with adjustable current limitation and an external reset option. The thyristor-based power section supports inside-delta circuit wiring, which reduces the per-phase current seen by the soft starter — useful for retrofitting into existing delta-configured motor windings without over-speccing the unit. Rated for degree of pollution 3 per IEC 60947-4-2, meaning the environment can have conductive dust or occasional condensation — typical of furnace, mill, or wash-down areas. Storage temperature range is -25 to +80 °C; operating ambient must stay below 60 °C, with derating starting above 40 °C. Maximum motor cable length is 500 m — sufficient for most plant-floor runs. Display version provides fault signal indication on the unit itself, which speeds troubleshooting.","metaTitle":"Siemens 3RW4443-6BC44 SIRIUS Soft Starter, 352A at 40°C","metaDescription":"Siemens 3RW4443-6BC44 SIRIUS soft starter, 352 A at 40 °C, 690 V insulation voltage, 50-60 Hz, 230 V control. Current production. Sourced to order. Request a quote.","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":"352A","at 50 °C rated value":"312A","at 60 °C rated value":"270A","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":"110kW","at standard circuit at 50 °C rated value":"125hp","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":"200kW","at inside-delta circuit at 50 °C rated value":"250hp","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":"89W","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":"40A","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":"$4,634.00 – $6,316.22","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=378640&mlfb=3RW4443-6BC44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RW4443-6BC44/alternatives.json"},"ai":{"faq":[{"question":"What is the rated current of 3RW4443-6BC44 at different temperatures?","answer":"352 A at 40 °C, 312 A at 50 °C, and 270 A at 60 °C. The ambient temperature determines the maximum motor FLA the unit can handle."},{"question":"What are the mounting dimensions and clearances for 3RW4443-6BC44?","answer":"210 mm wide, 230 mm high, 298 mm deep. Required clearances: 100 mm above, 75 mm below, 5 mm at the sides."},{"question":"What wire sizes does the 3RW4443-6BC44 accept for main and auxiliary circuits?","answer":"Main circuit: stranded 70-240 mm² (AWG 2/0 to 500 kcmil). Auxiliary contacts: solid 0.5-2.5 mm² (20-14 AWG)."},{"question":"How do I get pricing and availability for 3RW4443-6BC44?","answer":"We source this part to order against an RFQ. Submit a request, and we will confirm current pricing and availability at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4443-6BC44","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/3RW4443-6BC44 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}}