{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4073-6BB45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4073-6BB45","canonicalUrl":"https://aoctrl.com/siemens/3RW4073-6BB45","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4073-6BB45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4073-6BB45 soft starter, Size S12, 230 A at 40 °C, 50/60 Hz, 600 V insulation voltage, screw fixing, busbar main circuit connection.","salesMarkdown":"## 230 A at 40 °C — motor starting duty and thermal derating The 3RW4073-6BB45: Rated 230 A at 40 °C, this SIRIUS soft starter handles motor starting current for loads up to that full-load current, with the thyristor stack sized for the inrush duration. Derate to 205 A at 50 °C and 180 A at 60 °C — the thermal ceiling for a 40 °C enclosure ambient is the design point; above that, ventilation or a larger frame is needed to hold the continuous rating. The adjustable current limitation lets you set the starting current between 20% and the rated value, so the same unit can be tuned for different load inertias — pump, conveyor, or fan — without changing hardware. Minimum load is 20% of the rated current, which covers most motor applications except very light-duty cycles. ## Size S12 frame — panel integration and wiring constraints The Size S12 envelope (230 mm height, 160 mm width, 278 mm depth) mounts via screw fixing to a vertical surface. With the optional fan, the mounting surface can be rotated ±90° or tilted ±22.5° front-to-back; without the fan, rotation is limited to ±10°. This matters for retrofit panels where the gland plate position or cable entry direction is fixed. Main circuit wiring accepts stranded 70–240 mm² or finely stranded 50–240 mm², with busbar connection as the primary termination. The back clamping point handles 250–500 kcmil, the front clamping point 3/0–600 kcmil — enough for parallel feeds on high-current installations. Auxiliary control wiring uses 0.5–2.5 mm² solid with 20–14 AWG equivalents. Clearance requirements: 100 mm upward, 75 mm downward, 5 mm at the sides. The 5 mm side gap is tight — adjacent devices or enclosure walls must respect this for airflow and arc-flash clearance per IEC 60947-4-2. ## Integrated protection and control — reducing external component count Built-in motor overload protection and intrinsic device protection eliminate the need for a separate thermal overload relay in most installations. The external reset input allows remote fault recovery, which is standard for automated lines where manual reset at the panel is impractical. The derating temperature is 40 °C — above that, the current ratings in the spec table apply.","metaTitle":"Siemens 3RW4073-6BB45 SIRIUS Soft Starter, 230 A, Size S12","metaDescription":"Siemens 3RW4073-6BB45 SIRIUS soft starter, 230 A at 40 °C, Size S12 frame.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"278mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"160mm","title":"3RW4073-6BB45","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter S12 230 A, 160 kW/500 V, 40 °C 400-600 V AC, 230 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5073-6AB15<<","During Storage":"-40 ... +80°C","External Reset":"Yes","Finely Stranded":"50 ... 240 mm²","lifecycle_stage":"current","During Operation":"-25 ... +60°C","Fastening Method":"screw fixing","Minimum Load [%]":"20%","For Main Contacts":"2/0 ... 500 kcmil","Mounting Position":"With additional fan: With vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back Without additional fan: With vertical mounting surface +/-10° rotatable, with vertical mounting surface +/- 10° t","Product Brand Name":"SIRIUS","Degree Of Pollution":"3, acc. to IEC 60947-4-2","Product Designation":"Soft starter","Wire Length Maximum":"300m","Derating Temperature":"40°C","Inside-Delta Circuit":"No","at 50 Hz rated value":"230V","at 60 Hz rated value":"230V","at 40 °C rated value":"230A","at 50 °C rated value":"205A","at 60 °C rated value":"180A","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","Size Of Engine Control Device":"S12","Using The Back Clamping Point":"250 ... 500 kcmil","Insulation Voltage Rated Value":"600V","Using The Front Clamping Point":"3/0 ... 600 kcmil","Operating Frequency Rated Value":"50 ... 60Hz","Display Version For Fault Signal":"red","Integrated Bypass Contact System":"Yes","For Auxiliary And Control Circuit":"screw-type terminals","Product Component Motor Brake Output":"No","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":"No","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":"2","Type Of Voltage Of The Control Supply Voltage":"AC","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 ... 600V","contact rating of auxiliary contacts according to UL":"B300 / R300","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":"90W","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":"80A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2,819.40","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/61960b99c29d30cb900da1d5b5b91b7c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=518591&mlfb=3RW4073-6BB45"},"ai":{"faq":[{"question":"What is the maximum cable size for the main circuit on 3RW4073-6BB45?","answer":"The main circuit accepts stranded 70–240 mm² or finely stranded 50–240 mm², with busbar connection as the primary termination. The back clamping point handles 250–500 kcmil, the front clamping point 3/0–600 kcmil."},{"question":"Does 3RW4073-6BB45 include motor overload protection?","answer":"An external reset input allows remote fault recovery."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4073-6BB45","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/3RW4073-6BB45 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}