{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4055-6BB45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4055-6BB45","canonicalUrl":"https://aoctrl.com/siemens/3RW4055-6BB45","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4055-6BB45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4055-6BB45 soft starter, Size S6, 134 A at 40 °C, 230 V at 50/60 Hz, 600 V insulation, screw fixing, busbar connection.","salesMarkdown":"## 134 A at 40 °C — the rating that sizes the motor branch The 3RW4055-6BB45: That 40 °C figure is the reference for motor full-load current matching — if your panel ambient runs hotter, use the derated value for the BOM line. Built-in motor overload protection and adjustable current limitation mean you don't need a separate overload relay in most installations — the soft starter handles both ramp control and thermal protection in one device. Intrinsic device protection covers the thyristors and control electronics against fault conditions. ## Size S6 frame — panel cutout and wiring constraints Size S6 defines the physical envelope: 198 mm height, 120 mm width, 250 mm depth. Mounting is screw fixing with specific orientation limits — with the optional 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° and tilt to ±10°. Main circuit wiring accepts busbar connection or cable: 2x (25–120 mm²) stranded, 2x (16–95 mm²) finely stranded, or 4–250 kcmil. Auxiliary contacts take 2x (20–14 AWG). Clearance around the unit: 100 mm above, 75 mm below, 5 mm at the sides. ## 230 V control, 600 V insulation — system voltage fit The insulation voltage is rated 600 V, so the unit fits 400 V and 480 V systems with headroom. Pollution degree 3 per IEC 60947-4-2 means it's rated for industrial environments with conductive pollution — no derating needed for dirty panel air. The minimum load is 20% — below that the motor may not start reliably. Maximum motor cable length is 300 m.","metaTitle":"Siemens 3RW4055-6BB45 SIRIUS Soft Starter, 134 A at 40 °C","metaDescription":"Siemens 3RW4055-6BB45 SIRIUS soft starter, 134 A at 40 °C, Size S6 frame. Active production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"250mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"120mm","title":"3RW4055-6BB45","Height":"198mm","Upwards":"100mm","Stranded":"2x (25 ... 120 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter S6 134 A, 90 kW/500 V, 40 °C 400-600 V AC, 230 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5055-6AB15<<","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":"230V","at 60 Hz rated value":"230V","at 40 °C rated value":"134A","at 50 °C rated value":"117A","at 60 °C rated value":"100A","For Auxiliary Contacts":"2x (20 ... 14)","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":"screw-type 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 (0.5 ... 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":"90kW","at standard circuit at 50 °C rated value":"100hp","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":"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%","For Auxiliary Contacts Finely Stranded With Core End Processing":"2x (20 ... 16)","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":"$2,026.92","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/58aa433d1317f13ecf3d9f808f911620.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=22027&mlfb=3RW4055-6BB45"},"ai":{"faq":[{"question":"What is the 3RW4055-6BB45 rated current at different ambient temperatures?","answer":"The soft starter is rated 134 A at 40 °C, derating to 117 A at 50 °C and 100 A at 60 °C. Use the derated value matching your panel ambient for motor sizing."},{"question":"Does the 3RW4055-6BB45 include built-in motor overload protection?","answer":"Yes, motor overload protection is integrated, along with adjustable current limitation and intrinsic device protection for the thyristors and electronics. In most installations no separate overload relay is needed."},{"question":"What wire sizes does the 3RW4055-6BB45 accept for main and control circuits?","answer":"Main circuit: busbar connection or 2x (25–120 mm²) stranded, 2x (16–95 mm²) finely stranded, or 4–250 kcmil. Auxiliary contacts: 2x (20–14 AWG)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4055-6BB45","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/3RW4055-6BB45 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}}