{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4444-6BC36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4444-6BC36","canonicalUrl":"https://aoctrl.com/siemens/3RW4444-6BC36","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4444-6BC36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4444-6BC36 soft starter, 433 A at 40 °C, 690 V insulation voltage, 50/60 Hz, inside-delta circuit, screw fixing, 298 mm depth.","salesMarkdown":"## 433 A at 40 °C — what that means for your motor The 3RW4444-6BC36: That 433 A figure is the continuous current at the standard 40 °C enclosure ambient — if your panel runs hotter, you need to use the derated value for the actual ambient temperature to avoid nuisance tripping or reduced thyristor life. The insulation voltage is rated 690 V, giving headroom on 400/480 V systems. Operating frequency is 50/60 Hz, so no derating or configuration change is needed when moving between line frequencies. ## Inside-delta wiring and current limitation This unit supports inside-delta circuit topology, which connects the soft starter in the delta legs of a six-lead motor rather than in the supply lines. That reduces the current the soft starter carries to about 58% of the motor FLA — so a 433 A inside-delta unit can control a motor with a line current up to roughly 750 A. Confirm your motor has six accessible leads before specifying this wiring method. Adjustable current limitation lets you set the starting current between 8% and 100% of the motor's rated current. The 8% minimum load capability means it can soft-start lightly loaded conveyors or pumps without the motor stalling or the starter dropping out. ## Mounting, wiring, and panel fit Dimensions are 298 mm deep, 210 mm wide, 230 mm high. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides for airflow and cable bending radius. Main power wiring accepts stranded copper from 70 to 240 mm², or AWG/kcmil 2/0 to 500 kcmil. The main current circuit uses busbar connection — plan for busbar stubs or a busbar kit, not lug terminals. Auxiliary control wiring is solid 0.5–2.5 mm² or stranded 20–14 AWG. Maximum motor cable length is 500 m — beyond that, reflected wave voltages at the motor terminals can stress the winding insulation, especially on 480 V systems. Keep the run under 500 m or add a dV/dt filter at the starter output. ## Protection, diagnostics, and environment Motor overload protection is integrated — no separate overload relay needed for most installations. Intrinsic device protection covers the thyristors against overtemperature and short-circuit events. An external reset input allows remote fault clearing from a PLC or pushbutton, and the onboard display shows the fault code for fast troubleshooting. Pollution degree 3 per IEC 60947-4-2 means it's rated for industrial environments where conductive dust or occasional condensation occurs — typical for motor control centers and factory-floor panels. Storage temperature range is -25 to +80 °C; maximum operating ambient is 60 °C.","metaTitle":"Siemens 3RW4444-6BC36 SIRIUS Soft Starter, 433 A, 690 V","metaDescription":"Siemens 3RW4444-6BC36 SIRIUS soft starter, 433 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":"3RW4444-6BC36","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 575 V, 50 °C standard: 215 A, 200 hp Inside-delta: 372 A, 350 hp 400-690 V AC, 115 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":"115V","at 60 Hz rated value":"115V","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/52684ce8f112539d97574f98fa796f1e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=497273&mlfb=3RW4444-6BC36"},"ai":{"faq":[{"question":"What is the 3RW4444-6BC36's depth for panel layout?","answer":"The depth is 298 mm. Combined with the 210 mm width and 230 mm height, plus 100 mm clearance above and 75 mm below, this determines the minimum enclosure depth for mounting."},{"question":"What wire sizes does the 3RW4444-6BC36 accept for main power?","answer":"Stranded copper 70–240 mm² or AWG/kcmil 2/0–500 kcmil. The main circuit uses busbar connection, so plan for busbar stubs rather than individual lug terminals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4444-6BC36","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/3RW4444-6BC36 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}}