{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4444-6BC46","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4444-6BC46","canonicalUrl":"https://aoctrl.com/siemens/3RW4444-6BC46","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4444-6BC46","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4444-6BC46 soft starter, 433 A rated at 40 °C, 50/60 Hz, 690 V insulation class, thyristor-switched with adjustable current limitation and motor overload protection.","salesMarkdown":"## SIRIUS 3RW4444-6BC46 soft starter — 433 A, thyristor-switched The Siemens 3RW4444-6BC46 is a SIRIUS-brand soft starter rated 433 A at 40 °C, 372 A at 50 °C, and 320 A at 60 °C, operating on 50/60 Hz line frequency with a rated insulation voltage of 690 V. It uses thyristor switching for the main current circuit and supports inside-delta wiring, which reduces the current draw through the device by roughly 58% compared to standard in-line wiring — a key consideration when sizing upstream protection. The minimum load threshold is 8% of the motor's full-load current, so it handles lightly loaded starts without nuisance tripping. ## Dimensions, mounting, and wiring The unit measures 230 mm high, 210 mm wide, and 298 mm deep, mounting via screw fixing on a vertical surface. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides — the side gap is tight, so plan for adequate ventilation in a crowded enclosure. Main current connections accept busbar or cable: stranded 70–240 mm², finely stranded 50–240 mm², or AWG 2/0–500 kcmil. Auxiliary contacts accept 2x (0.5–2.5 mm²) solid or 2x (20–14 AWG). The back clamping point handles 250–500 kcmil; the front clamping point handles 3/0–600 kcmil. Maximum wire length is 500 m — relevant for remote motor installations where voltage drop must be checked. Storage temperature range is -25 to +80 °C; during operation the ambient limit is 60 °C. Derating starts above 40 °C, so the 433 A rating applies only up to that point; at 50 °C it drops to 372 A, and at 60 °C to 320 A. The soft starter includes an external reset input and a display for fault signaling, supporting on-device diagnostics without needing a separate HMI. Intrinsic device protection is built in, covering the thyristors against over-temperature and short-circuit conditions.","metaTitle":"Siemens 3RW4444-6BC46 SIRIUS Soft Starter, 433 A, 50/60 Hz","metaDescription":"Siemens 3RW4444-6BC46 SIRIUS soft starter, rated 433 A at 40 °C, 50/60 Hz. Active production. Sourced to order against RFQ. Dimensions 230 x 210 x 298 mm.","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":"3RW4444-6BC46","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 690 V, 40 °C standard: 250 A, 250 kW Inside-delta: only up to 600 V 400-690 V AC, 230 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5544-6HA16<<","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":"230V","at 60 Hz rated value":"230V","at 40 °C rated value":"433A","at 50 °C rated value":"372A","at 60 °C rated value":"320A","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":"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 ... 690V","at 690 V at standard circuit at 40 °C rated value":"250kW","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":"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/1ebf7c26014d5997fc7da0e77c4fab5b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=462143&mlfb=3RW4444-6BC46"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4444-6BC46","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/3RW4444-6BC46 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}}