{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4055-2BB34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4055-2BB34","canonicalUrl":"https://aoctrl.com/siemens/3RW4055-2BB34","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4055-2BB34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4055-2BB34 soft starter, size S6, 134 A at 40 °C, 600 V insulation voltage, 50/60 Hz, thyristor-based, screw fixing.","salesMarkdown":"## 134 A at 40 °C — the real-world current ceiling The 3RW4055-2BB34: That 40 °C figure is the nameplate rating — if your panel ambient runs hotter, size against the derated value, not the headline number. Motor overload protection is built in, and the current limitation is adjustable — you set the starting current ceiling as a percentage of the motor FLA, minimum 20 %. The thyristor stack handles the ramp with no mechanical contact wear. Insulation voltage is rated 600 V, operating frequency covers 50...60 Hz — fits global line supplies. Maximum motor cable run is 300 m; beyond that, voltage drop and reflected-wave effects need checking. ## Size S6 — panel cutout and mounting constraints This is a size S6 frame: 250 mm deep, 120 mm wide, 198 mm tall. Fastening is screw fixing — no DIN-rail clip. Clearance above the unit needs 100 mm, below 75 mm, and only 5 mm at the sides — tight side-by-side mounting is possible. Mounting position is flexible: with the optional fan, the unit mounts vertical with +/-90° rotation and +/-22.5° tilt front-to-back. Without the fan, rotation is limited to +/-10°. Pollution degree 3 per IEC 60947-4-2 — rated for conductive-dust industrial environments. ## Wiring — main and control terminals Main current circuit connection is busbar. The front and back clamping points accept 6 AWG to 2/0; using both clamping points together maxes out at 2x 1/0. Stranded wire range is 2x (25...120 mm²), finely stranded 2x (16...95 mm²). This is a standard catalog item from the SIRIUS line. We source it against your BOM quantity and confirm availability and pricing at quote time. No stock-holding claim; sourced per RFQ.","metaTitle":"Siemens 3RW4055-2BB34 SIRIUS Soft Starter, 134 A, S6","metaDescription":"Siemens 3RW4055-2BB34 SIRIUS soft starter, 134 A at 40 °C, size S6, 600 V insulation, 50/60 Hz. Active production — quoted to order against your BOM.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"250mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"120mm","title":"3RW4055-2BB34","Height":"198mm","Upwards":"100mm","Stranded":"2x (25 ... 120 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter S6 117 A, 75 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 >>3RW5055-2AB14<<","During Storage":"-40 ... +80°C","External Reset":"Yes","Finely Stranded":"2x (16 ... 95 mm²)","lifecycle_stage":"current","During Operation":"-25 ... +60°C","Fastening Method":"screw fixing","Minimum Load [%]":"20%","For Main Contacts":"4 ... 250 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":"134A","at 50 °C rated value":"117A","at 60 °C rated value":"100A","For Auxiliary Contacts":"2x (24 ... 16)","For Main Current Circuit":"busbar connection","Motor Overload Protection":"Yes","Using Both Clamping Points":"max. 2x 1/0","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Size Of Engine Control Device":"S6","Using The Back Clamping Point":"6 ... 2/0","Insulation Voltage Rated Value":"600V","Using The Front Clamping Point":"6 ... 2/0","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":"75kW","at standard circuit at 50 °C rated value":"75hp","Finely Stranded Without Core End Processing":"max. 1x 50 mm², 1x 70 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":"60W","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":"59A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/19018fbebd435299860cf2efd4664d7f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=271885&mlfb=3RW4055-2BB34"},"ai":{"faq":[{"question":"Where can I buy 3RW4055-2BB34 and how do I get a price?","answer":"Submit an RFQ — we confirm current availability and pricing at quote time. No stock-holding claim; availability confirmed per request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4055-2BB34","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/3RW4055-2BB34 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}}