{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4444-2BC46","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4444-2BC46","canonicalUrl":"https://aoctrl.com/siemens/3RW4444-2BC46","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4444-2BC46","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4444-2BC46 soft starter, 433 A at 40 °C, 690 V insulation voltage, 50/60 Hz, inside-delta circuit, thyristor, screw fixing, 230 x 210 x 298 mm.","salesMarkdown":"## Continuous current and the derating that matters The 3RW4444-2BC46: That 40 °C figure is the baseline — in a closed panel with other heat sources, expect to budget for the 50 °C or 60 °C column unless you have forced ventilation. Insulation voltage rated 690 V, operating frequency 50…60 Hz. The 690 V ceiling means this unit handles 400 V line-to-line systems with margin; no voltage derating needed for standard 380–480 V grids. ## Inside-delta wiring and current limitation Supports inside-delta circuit configuration — the soft starter connects in the delta legs of a six-lead motor, reducing the line current the device carries relative to the motor full-load current. For a given motor, this lets a smaller-frame soft starter do the job. Adjustable current limitation lets you set the start current between 8% and 100% of the device rating. The 8% minimum load threshold means the thyristors may not fire reliably below that point — factor this into no-load commissioning or very light loads. ## Panel layout and wiring constraints Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides — these are for ventilation and arc-flash separation per IEC 60947-4-2. Main circuit accepts stranded 70…240 mm² or kcmil 2/0…500. Auxiliary connections take solid 0.25…1.5 mm². The main current circuit uses busbar connection — plan for busbar lugs, not cable lugs, on the power terminals. Dimensions 230 mm high, 210 mm wide, 298 mm deep. The depth is the largest envelope — ensure the enclosure depth accommodates the unit plus the 100 mm top clearance for cable bending and airflow. ## Protection and diagnostics built in Integrated motor overload protection eliminates the separate overload relay in many panels. Intrinsic device protection covers the soft starter itself against overtemperature and overcurrent. On-board display for fault signals — no external HMI needed for basic diagnostics. External reset input allows remote clearing of fault conditions. Pollution degree 3 per IEC 60947-4-2 — rated for industrial environments with conductive dust or occasional condensation. Storage temperature -25…+80 °C, operation up to 60 °C ambient.","metaTitle":"Siemens 3RW4444-2BC46 Soft Starter, 433 A, 690 V, SIRIUS","metaDescription":"Siemens 3RW4444-2BC46 SIRIUS soft starter, 433 A at 40°C, 690 V insulation, inside-delta capable, active production. Quoted to order against RFQ.","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":"3RW4444-2BC46","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 spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5544-2HA16<<","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 (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":"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%","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/77fd6a75098c20d94592a6045a3ca756.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=531301&mlfb=3RW4444-2BC46"},"ai":{"faq":[{"question":"What is the continuous current rating at elevated ambient temperatures?","answer":"433 A at 40 °C, derated to 372 A at 50 °C, and 320 A at 60 °C. Use the 50 °C or 60 °C column if the soft starter shares a closed panel with other heat-generating devices."},{"question":"Can this soft starter be wired in an inside-delta configuration?","answer":"Yes, it supports inside-delta circuit wiring. This connects the soft starter in the delta legs of a six-lead motor, reducing the line current the device carries relative to the motor FLA."},{"question":"What compliance documentation does Siemens provide for 3RW4444-2BC46?","answer":"The device is designed to IEC 60947-4-2 (pollution degree 3) and carries the SIRIUS brand."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4444-2BC46","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/3RW4444-2BC46 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}}