{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4073-2BB35","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4073-2BB35","canonicalUrl":"https://aoctrl.com/siemens/3RW4073-2BB35","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4073-2BB35","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4073-2BB35 soft starter, Size S12, 230 A at 40 °C, 160 x 230 x 278 mm, screw fixing, thyristor-based, adjustable current limitation, motor overload protection.","salesMarkdown":"## Size S12 footprint and 230 A rating The 3RW4073-2BB35 is a Siemens SIRIUS soft starter in the Size S12 frame — 160 mm wide, 230 mm tall, 278 mm deep. That footprint is the first thing to check against your panel layout; the S12 is the largest standard frame in the 3RW40 family and needs the matching gland plate and busbar clearance. If your motor FLA lands near the 230 A mark and the panel ambient runs above 40 °C, the 50 °C derating figure is the one to size against — don't spec by the 40 °C number alone. Built around thyristor technology with adjustable current limitation and integrated motor overload protection. ## Wiring and termination — what fits Main circuit connection is via busbar, accepting stranded cable from 70 to 240 mm² and finely stranded from 50 to 240 mm². The back clamping point takes 250–500 kcmil; the front clamping point takes 3/0–600 kcmil. If you're landing parallel runs, the terminal allows two conductors per phase — min 2x 2/0, max 2x 500 kcmil. That's a standard spring-cage range — no special ferrules needed, but stranded wire with a ferrule seats cleaner. ## Environmental limits and protection class The derating temperature threshold kicks in at 40 °C — the 230 A rating holds up to that point, then drops linearly as shown in the derating curve. Maximum motor cable length is 300 m — factor that into the install if the motor is remote from the panel. The minimum load is 20% of the soft starter's rated current, so it won't regulate properly on a grossly undersized motor. ## Active production — sourcing posture No official successor or cross-reference is listed — the 3RW4073-2BB35 is the current production variant in the SIRIUS line.","metaTitle":"Siemens 3RW4073-2BB35 SIRIUS Soft Starter, 230 A, Size S12","metaDescription":"Siemens 3RW4073-2BB35 SIRIUS soft starter, 230 A at 40 °C, Size S12, 160x230x278 mm. Active production. Sourced to order against BOM. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"278mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"160mm","title":"3RW4073-2BB35","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 spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5073-2AB15<<","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 (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","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":"spring-loaded 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 (0.25 ... 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%","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/d98b9e017c309ef1071eebc8f5f1ce1f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=18794&mlfb=3RW4073-2BB35"},"ai":{"faq":[{"question":"What is the maximum motor cable length for the 3RW4073-2BB35?","answer":"The maximum motor cable length is 300 m. This limit applies to the cable between the soft starter and the motor."},{"question":"Does the 3RW4073-2BB35 support inside-delta connection?","answer":"No, the 3RW4073-2BB35 does not support inside-delta circuit connection. It is designed for standard in-line motor wiring."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4073-2BB35","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/3RW4073-2BB35 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}}