{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4076-2BB34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4076-2BB34","canonicalUrl":"https://aoctrl.com/siemens/3RW4076-2BB34","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4076-2BB34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4076-2BB34 soft starter, 432 A at 40 °C, S12 frame size, 600 V insulation voltage, 50/60 Hz, busbar connection.","salesMarkdown":"## 432 A at 40 °C — the thermal ceiling for motor starting The 3RW4076-2BB34: That 40 °C figure is the common panel ambient in a ventilated enclosure; if your panel runs hotter, the usable current drops — plan the motor FLA against the derated value at your actual ambient, not the headline 432 A. Motor overload protection is integrated per IEC 60947-4-2, so you skip a separate overload relay in the power circuit. The adjustable current limitation lets you tune the start ramp to the load — soft-start current can be set below the motor locked-rotor draw, which matters for conveyors and pumps that don't need full torque at zero speed. ## S12 frame — panel cutout and wiring constraints Physical envelope is 230 mm high by 160 mm wide by 278 mm deep — the S12 frame size. Screw fixing to the mounting surface; busbar connection for the main current circuit, accepting stranded cable 70–240 mm² or 2/0–500 kcmil. Mounting position is flexible: with the additional fan, the unit can be rotated ±90° on a vertical surface and tilted ±22.5° front/back; without the fan, rotation is limited to ±10°. Minimum clearances are 100 mm above, 75 mm below, and 5 mm at the sides — the top clearance is the critical one for heat plume rise from the thyristor stack.","metaTitle":"Siemens 3RW4076-2BB34 SIRIUS Soft Starter, 432 A, S12 Frame","metaDescription":"Siemens 3RW4076-2BB34 SIRIUS soft starter, 432 A at 40 °C, S12 frame, 600 V insulation. 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 (0.25 ... 1.5 mm²)","Width":"160mm","title":"3RW4076-2BB34","Height":"230mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter S12 385 A, 300 hp/460 V, 50 °C 200-460 V AC, 115 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%","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":"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/8f919846ec02e8a524bddbac8da09499.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=354342&mlfb=3RW4076-2BB34"},"ai":{"faq":[{"question":"What is the maximum motor cable length for 3RW4076-2BB34?","answer":"The maximum wire length between the soft starter and the motor is 300 m. Beyond that, voltage drop and reflected wave effects on the motor terminals become a concern."},{"question":"What compliance documentation does Siemens provide for 3RW4076-2BB34?","answer":"The soft starter is designed to IEC 60947-4-2 for pollution degree 3. Standard Siemens documentation includes the CE declaration of conformity and the product manual covering installation, commissioning, and parameter settings. Specific RoHS/REACH declarations are available from Siemens support by serial number range."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4076-2BB34","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/3RW4076-2BB34 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}}