{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4076-2BB45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4076-2BB45","canonicalUrl":"https://aoctrl.com/siemens/3RW4076-2BB45","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4076-2BB45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4076-2BB45 soft starter, Size S12, 432 A at 40 °C, 230 V, 50/60 Hz, screw fixing, pollution degree 3.","salesMarkdown":"## Current ratings and thermal derating The 3RW4076-2BB45 is rated 432 A at 40 °C, 385 A at 50 °C, and 335 A at 60 °C — the derating above 40 °C is steep, so the ambient inside the panel determines the usable current. The derating temperature is 40 °C; above that, the thyristor junction temperature limits the continuous output. For a 50 °C panel ambient, budget 385 A maximum. ## Mounting and panel integration Fastening is screw fixing, not DIN rail — the Size S12 frame (160 mm wide, 230 mm high, 278 mm deep) bolts directly to the backplate. Clearance above the unit is 100 mm, below 75 mm, and at the side 5 mm. Mounting position is constrained: with an additional fan, the unit can be mounted vertically with +/-90° rotation and +/-22.5° tilt front/back. Without the fan, only +/-10° rotation and +/-10° tilt is allowed — plan the orientation before drilling the gland plate. ## Wiring and connection Main circuit connections accept stranded cable 70...240 mm² or busbar connections; the front clamping point takes 3/0...600 kcmil, the back clamping point 250...500 kcmil. Using both clamping points requires min. 2x 2/0, max. 2x 500 kcmil. Auxiliary contacts accept 2x (24...16) AWG solid wire (0.25...1.5 mm²). The maximum motor cable length is 300 m — beyond that, reflected wave voltage can stress the thyristors. ## Environmental and protection Operating ambient is -25...+60 °C; storage range is -40...+80 °C. Insulation voltage rated at 600 V, operating frequency 50...60 Hz at 230 V. Intrinsic device protection and motor overload protection are integrated — the soft starter monitors the motor current directly.","metaTitle":"Siemens 3RW4076-2BB45 SIRIUS Soft Starter, 432A, Size S12","metaDescription":"Siemens 3RW4076-2BB45 SIRIUS soft starter, 432 A at 40 °C, Size S12, 230 V, 50/60 Hz. Active production, sourced to order against RFQ.","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":"3RW4076-2BB45","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter S12 432 A, 315 kW/500 V, 40 °C 400-600 V AC, 230 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":"230V","at 60 Hz rated value":"230V","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":"$4,837.43","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ddeeb836c10aa3da0e74ab41e5157e81.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=319107&mlfb=3RW4076-2BB45"},"ai":{"faq":[{"question":"What is the lead time for the 3RW4076-2BB45?","answer":"No stock-holding claim is made; availability is checked per RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4076-2BB45","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/3RW4076-2BB45 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}}