{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4076-2BB35","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4076-2BB35","canonicalUrl":"https://aoctrl.com/siemens/3RW4076-2BB35","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4076-2BB35","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4076-2BB35 soft starter, Size S12, 432 A at 40 °C, 50/60 Hz, 600 V insulation voltage, screw fixing.","salesMarkdown":"## What the current ratings mean for your motor The 3RW4076-2BB35 is a SIRIUS soft starter, Size S12, rated 432 A at 40 °C — that's the full-load current it can handle continuously at that ambient. It operates on 50/60 Hz supply with a 600 V insulation voltage rating, and includes adjustable current limitation and motor overload protection — so you can set the starting current profile to match the load without adding an external overload relay. ## Mounting and connection — what fits in the panel The unit measures 160 mm wide, 230 mm high, and 278 mm deep, and mounts with screw fixing. The mounting position has restrictions: with an additional fan it can rotate ±90° on a vertical surface and tilt ±22.5° front-to-back; without the fan, rotation is limited to ±10° and tilt to ±10°. Main circuit connections accept busbar or cable: stranded 70–240 mm², finely stranded 50–240 mm², or AWG 2/0–500 kcmil. The back clamping point takes 250–500 kcmil, the front takes 3/0–600 kcmil, and using both clamping points accepts 2/0–500 kcmil per side. Auxiliary control wiring uses solid 0.25–1.5 mm² or 24–16 AWG. The maximum motor cable length is 300 m — keep that in mind when running from the MCC to a remote motor. ## Environmental and protection specs Intrinsic device protection and motor overload protection are built in — no separate overload block needed for most applications. The minimum load setting is 20 % of the rated current, so it can handle lightly loaded motors without nuisance tripping.","metaTitle":"Siemens 3RW4076-2BB35 SIRIUS Soft Starter, 432 A, Size S12","metaDescription":"Siemens SIRIUS soft starter 3RW4076-2BB35, Size S12, rated 432 A at 40 °C. Active production. Quoted to order. Request a quote for 3RW4076-2BB35.","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":"3RW4076-2BB35","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter S12 385 A, 400 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 >>3RW5076-2AB15<<","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":"432A","at 50 °C rated value":"385A","at 60 °C rated value":"335A","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":"315kW","at standard circuit at 50 °C rated value":"400hp","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":"165W","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":"207A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/26c730e8d470f176c03d28fbb3070df7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=389106&mlfb=3RW4076-2BB35"},"ai":{"faq":[{"question":"What is the 3RW4076-2BB35's listed depth?","answer":"The depth is 278 mm. Combined with a width of 160 mm and height of 230 mm, this Size S12 unit needs a clear panel space of about 160 x 230 mm plus clearance for cabling and cooling."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4076-2BB35","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/3RW4076-2BB35 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}}