{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4445-6BC34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4445-6BC34","canonicalUrl":"https://aoctrl.com/siemens/3RW4445-6BC34","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4445-6BC34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4445-6BC34 soft starter, 542 A at 40 °C, 690 V insulation voltage, 50/60 Hz, inside-delta circuit, thyristor-based.","salesMarkdown":"## 542 A at 40 °C — the current ceiling that sets the motor match The 3RW4445-6BC34 is rated 542 A at 40 °C ambient, which means it directly handles a motor full-load current up to that figure without external bypass contactors for the starting duty. ## Inside-delta wiring and thyristor topology This soft starter supports inside-delta circuit configuration, which reduces the current through each thyristor leg compared to standard in-line wiring — useful for larger motors where the line current would otherwise push the unit to a larger frame size. The thyristors handle the switching with no mechanical contacts, so the unit is rated for continuous starting duty without contact wear. Motor overload protection is integrated, so you do not need a separate overload relay in the motor branch circuit — the soft starter's own electronics handle the thermal model. Adjustable current limitation lets you tune the starting current between 8 % and the full rating, matching the load characteristic (conveyor, pump, fan) without changing hardware. ## Mounting and connection flexibility for panel integration Mounting position allows a vertical surface with ±90° rotation and ±22.5° tilt front-to-back — the unit can be oriented to fit tight enclosures or existing busbar layouts. Fastening is screw fixing, not DIN rail, so plan for direct panel mounting with four screws. Main circuit connections accept stranded wire 70–240 mm², finely stranded 50–240 mm², or kcmil 2/0–500, with busbar connection also listed. The auxiliary control wiring uses solid 0.5–2.5 mm² or stranded 20–14 AWG. Dimensions are 298 mm deep × 210 mm wide × 230 mm high — allow clearance: 100 mm above, 75 mm below, 5 mm at the sides for airflow and cable bending radius.","metaTitle":"Siemens 3RW4445-6BC34 SIRIUS Soft Starter, 542 A","metaDescription":"Siemens 3RW4445-6BC34 SIRIUS soft starter, 542 A at 40 °C, 690 V insulation, inside-delta circuit. Active 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","title":"3RW4445-6BC34","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: 280 A, 200 hp Inside-delta: 485 A, 400 hp 200-460 V AC, 115 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5545-6HA14<<","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":"542A","at 50 °C rated value":"485A","at 60 °C rated value":"433A","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":"400hp","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":"145W","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":"62A","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/5d50d72ff1b72986fab606d6dcbd2552.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=404265&mlfb=3RW4445-6BC34"},"ai":{"faq":[{"question":"What is the 3RW4445-6BC34 used for?","answer":"It provides controlled acceleration and deceleration, integrated motor overload protection, and adjustable current limitation — used on pumps, conveyors, fans, and compressors in industrial panels."},{"question":"What compliance documentation does Siemens provide for the 3RW4445-6BC34?","answer":"The unit carries a degree of pollution 3 rating per IEC 60947-4-2, suitable for industrial environments with conductive dust. Standard Siemens documentation includes the declaration of conformity for CE/UKCA and the product manual; specific RoHS/REACH declarations are available from Siemens support."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4445-6BC34","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/3RW4445-6BC34 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}}