{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4076-2BB44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4076-2BB44","canonicalUrl":"https://aoctrl.com/siemens/3RW4076-2BB44","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4076-2BB44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS soft starter, 3RW4076-2BB44, S12 frame, 432 A at 40 °C, 50/60 Hz, 230 V control supply, integrated bypass, screw fixing.","salesMarkdown":"## What this SIRIUS soft starter delivers The Siemens 3RW4076-2BB44 is a SIRIUS S12 soft starter rated 432 A at 40 °C, 385 A at 50 °C, and 335 A at 60 °C — so the 40 °C figure is the one to size against unless your panel runs hot. It includes an integrated bypass contact system, which means once the motor is up to speed, the thyristors are shorted out and heat dissipation drops to near zero — a real help in a crowded enclosure. The control supply is 230 V at both 50 Hz and 60 Hz, and the operating frequency range is 50 to 60 Hz. Motor overload protection and intrinsic device protection are built in, and the current limitation is adjustable down to 20% of the rated motor current. This is a screw-fixed unit, size S12, measuring 230 mm high, 160 mm wide, and 278 mm deep — plan the gland plate and backpanel real estate accordingly. Clearance requirements: 100 mm above, 75 mm below, and 5 mm at the sides for airflow. The main circuit uses busbar connection; the stranded cable range is 70 to 240 mm², finely stranded 50 to 240 mm², and the front clamping point accepts 3/0 to 600 kcmil. Solid conductors for control wiring are 2x 0.25 to 1.5 mm². Operating temperature range is -25 to +60 °C, storage -40 to +80 °C, with derating starting at 40 °C. Insulation voltage rated at 600 V.","metaTitle":"Siemens 3RW4076-2BB44 SIRIUS Soft Starter, 432 A","metaDescription":"Siemens 3RW4076-2BB44 SIRIUS soft starter, 432 A at 40 °C, S12 size, integrated bypass. Active lifecycle. Sourced to order. Get 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":"3RW4076-2BB44","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter S12 432 A, 250 kW/400 V, 40 °C 200-460 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5076-2AB14<<","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%","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 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 AWG cables for main contacts":"2/0 ... 500 kcmil","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","for AWG cables for auxiliary contacts":"2x (24 ... 16)","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":"250kW","at standard circuit at 50 °C rated value":"300hp","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":"200 ... 460V","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/2ab5644afb7a66d635b33c1557ba90eb.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=405614&mlfb=3RW4076-2BB44"},"ai":{"faq":[{"question":"What voltage does the 3RW4076-2BB44 operate at?","answer":"The control supply voltage is 230 V at both 50 Hz and 60 Hz, and the operating frequency range is 50 to 60 Hz."},{"question":"Does the 3RW4076-2BB44 have an integrated bypass?","answer":"Yes, the 3RW4076-2BB44 includes an integrated bypass contact system that shorts the thyristors once the motor is at speed, reducing heat dissipation in the enclosure."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4076-2BB44","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/3RW4076-2BB44 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}}