{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4056-2BB45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4056-2BB45","canonicalUrl":"https://aoctrl.com/siemens/3RW4056-2BB45","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4056-2BB45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4056-2BB45 soft starter, size S6, 162 A at 40 °C, 230 V at 50/60 Hz, thyristor-based, screw fixing.","salesMarkdown":"The Siemens 3RW4056-2BB45 is a SIRIUS soft starter, size S6, designed to ramp induction motors up to speed and limit inrush current during start. It uses thyristors in the main circuit to control voltage to the motor, reducing mechanical shock on couplings and driven loads. Built-in motor overload protection means you don't need a separate overload relay for the motor branch circuit. The adjustable current limitation lets you dial in the start current to match the load — useful for conveyors, pumps, or compressors that need a soft start without tripping upstream protection. Mounts via screw fixing to a vertical panel surface. The 198 mm height, 120 mm width, and 250 mm depth give it a substantial footprint — plan for that depth when laying out the enclosure depth. Clearance requirements: 100 mm above, 75 mm below, and 5 mm at the sides. With an additional fan, the mounting surface can rotate ±90° or tilt ±22.5° front-to-back; without the fan, rotation is limited to ±10° and tilt to ±10°. Main circuit connections are via busbar or cable lugs. Stranded cable range is 2x (25 to 120 mm²); finely stranded accepts 2x (16 to 95 mm²). Solid wire connections are 2x (0.25 to 1.5 mm²) — that's for the control wiring, not the power legs. The front and back clamping points each accept 6 to 2/0 AWG; using both clamping points together maxes out at 2x 1/0 AWG. For main contacts, the range is 4 to 250 kcmil. Rated operational current drops with ambient temperature: 162 A at 40 °C, 145 A at 50 °C, and 125 A at 60 °C. Derating starts above 40 °C. Insulation voltage is rated 600 V, and the operating frequency is 50 to 60 Hz at 230 V. Minimum load is 20% of the rated current — below that, the soft starter may not regulate properly. Maximum motor cable length is 300 m. The unit is not configured for inside-delta wiring; it's a standard in-line soft starter.","metaTitle":"Siemens 3RW4056-2BB45 SIRIUS Soft Starter, 162A, Size S6","metaDescription":"Siemens SIRIUS 3RW4056-2BB45 soft starter, 162A at 40°C, size S6, current production. Thyristor-based, motor overload protection, adjustable current limit. Screw-fix mount, 250mm d","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":"3RW4056-2BB45","Height":"198mm","Upwards":"100mm","Stranded":"2x (25 ... 120 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter S6 162 A, 110 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 >>3RW5056-2AB15<<","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":"162A","at 50 °C rated value":"145A","at 60 °C rated value":"125A","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":"110kW","at standard circuit at 50 °C rated value":"150hp","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%","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":"75W","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":"87A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1,627.00","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f3e1ecba8b97a828c2d873b69f6e13b2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=508923&mlfb=3RW4056-2BB45"},"ai":{"faq":[{"question":"What are the key dimensions for panel layout?","answer":"Height 198 mm, width 120 mm, depth 250 mm. Allow 100 mm clearance above, 75 mm below, and 5 mm at the sides."},{"question":"What wire sizes does the main circuit accept?","answer":"Stranded: 2x (25 to 120 mm²). Finely stranded: 2x (16 to 95 mm²). Main contacts also accept 4 to 250 kcmil."},{"question":"Does it include motor overload protection?","answer":"Yes, motor overload protection is built in, along with intrinsic device protection and adjustable current limitation."},{"question":"What is the rated current at different temperatures?","answer":"162 A at 40 °C, 145 A at 50 °C, and 125 A at 60 °C. Derating begins above 40 °C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4056-2BB45","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/3RW4056-2BB45 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}}