{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4073-6BB35","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4073-6BB35","canonicalUrl":"https://aoctrl.com/siemens/3RW4073-6BB35","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4073-6BB35","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4073-6BB35 soft starter, size S12, 230 A at 40 °C, 600 V insulation, busbar connection, adjustable current limitation, pollution degree 3.","salesMarkdown":"## Continuous current derating — the real thermal limit The 3RW4073-6BB35 is rated 230 A at 40 °C, 205 A at 50 °C, and 180 A at 60 °C. That 50 A drop from 40 to 60 °C means the panel ambient temperature directly sets the motor current the starter can carry continuously — if the enclosure runs at 50 °C, you lose about 11 % of the headline rating. Derating temperature is 40 °C — above that, the thyristor junction temperature climbs faster than the case can shed heat. In a confined panel with other heat sources, budget for the 60 °C figure unless forced ventilation is fitted. ## Termination and wiring — busbar connection, dual clamping Main circuit termination is busbar connection, not cable lugs. The front clamping point accepts 3/0 to 600 kcmil; the back clamping point takes 250 to 500 kcmil. Using both clamping points allows min. 2x 2/0, max. 2x 500 kcmil — useful for paralleling conductors on high-current runs. The control terminals are separate from the power bus, so the wiring tray stays clean. ## Mounting and panel clearance Mounting is screw fixing, not DIN rail. The envelope is 160 mm wide, 230 mm tall, 278 mm deep — plan for a backplate that accommodates the depth plus cable bend radius. Clearance above the unit is 100 mm, below 75 mm, at the side 5 mm. Mounting position allows ±90° rotation with vertical surface when an additional fan is fitted, or ±10° rotation without fan. Tilt limits are ±22.5° with fan, ±10° without. For a standard vertical panel, no special orientation is needed. The SIRIUS family is Siemens' standard soft starter line, size S12. Pollution degree 3 per IEC 60947-4-2 means it is rated for industrial environments with conductive pollution — no need for additional conformal coating in most panel builds.","metaTitle":"Siemens 3RW4073-6BB35 SIRIUS Soft Starter, 230 A at 40 °C","metaDescription":"Siemens 3RW4073-6BB35 SIRIUS soft starter, size S12, rated 230 A at 40 °C. Active production, quoted to order.","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":"3RW4073-6BB35","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter S12 205 A, 200 hp/575 V, 50 °C 400-600 V AC, 115 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":"115V","at 60 Hz rated value":"115V","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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5c44f82f7517bebdd3dd05edaede0b82.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=43367&mlfb=3RW4073-6BB35"},"ai":{"faq":[{"question":"What is the maximum continuous current of the 3RW4073-6BB35 at 60 °C?","answer":"180 A at 60 °C. The rating drops from 230 A at 40 °C to 205 A at 50 °C, so panel ambient temperature must be factored into the motor full-load current selection."},{"question":"How can I order the 3RW4073-6BB35 and check availability?","answer":"Submit an RFQ for your BOM quantity."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4073-6BB35","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/3RW4073-6BB35 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}}