{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4426-3BC46","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4426-3BC46","canonicalUrl":"https://aoctrl.com/siemens/3RW4426-3BC46","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4426-3BC46","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4426-3BC46 soft starter, 133 A at 40 °C, 230 V, 50/60 Hz, 3-phase, integrated bypass, screw fixing.","salesMarkdown":"## Rated current and thermal derating The 3RW4426-3BC46: This derating curve is the primary selection gate — a 40 °C panel environment buys the full 133 A, but a 50 °C enclosure drops available current by over 11 %. The 8 % minimum load setting means it handles lightly loaded motors without tripping on undercurrent. ## Integrated bypass and inside-delta wiring An integrated bypass contact system and thyristor stack mean the soft starter runs the motor through the SCRs only during start and stop; once at speed, the bypass closes and the SCRs cool. This reduces heat dissipation in the enclosure and extends thyristor life. The inside-delta circuit option allows wiring the soft starter in the motor delta loop, reducing the unit's current rating requirement by about 42 % compared to in-line connection — a common trick for larger motors where panel space is tight. ## Mounting, clearances, and terminations Screw fixing to a vertical mounting surface; the unit can be rotated ±90° or tilted ±22.5° front-to-back. Minimum clearance: 100 mm above, 75 mm below, 5 mm at the sides. The 270 mm depth and 170 mm width fit a standard 600 mm deep enclosure with room for gland plates. ## Protection and control features Motor overload protection and intrinsic device protection are built in — no separate overload relay needed for most applications. Adjustable current limitation lets you set the start current between the minimum load threshold and the unit's rated maximum. External reset supports remote restart after a fault. The display shows fault codes, which speeds troubleshooting on the line.","metaTitle":"Siemens 3RW4426-3BC46 SIRIUS Soft Starter, 133 A, 230 V","metaDescription":"Siemens 3RW4426-3BC46 SIRIUS soft starter, 133 A at 40 °C, 230 V, 50/60 Hz. Active production, integrated bypass.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"270mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"170mm","title":"3RW4426-3BC46","Height":"192mm","Upwards":"100mm","Stranded":"2x (4 ... 50 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 690 V, 40 °C standard: 77 A, 75 kW Inside-delta: only up to 600 V 400-690 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5526-3HA16<<","During Storage":"-25 ... +80°C","External Reset":"Yes","lifecycle_stage":"current","During Operation":"60°C","Fastening Method":"screw fixing","Minimum Load [%]":"8%","Mounting Position":"with vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back","Product Brand Name":"SIRIUS","Degree Of Pollution":"3, acc. to IEC 60947-4-2","Product Designation":"Soft starter","Wire Length Maximum":"500m","Derating Temperature":"40°C","Inside-Delta Circuit":"Yes","at 50 Hz rated value":"230V","at 60 Hz rated value":"230V","at 40 °C rated value":"133A","at 50 °C rated value":"118A","at 60 °C rated value":"102A","For Auxiliary Contacts":"2x (24 ... 16)","For Main Current Circuit":"box terminal","Motor Overload Protection":"Yes","Using Both Clamping Points":"2x (10 ... 1/0)","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Using The Back Clamping Point":"10 ... 2/0","Insulation Voltage Rated Value":"690V","Using The Front Clamping Point":"10 ... 2/0","Operating Frequency Rated Value":"50 ... 60Hz","Display Version For Fault Signal":"Display","Integrated Bypass Contact System":"Yes","For Auxiliary And Control Circuit":"spring-loaded terminals","Product Component Motor Brake Output":"Yes","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":"Yes","at standard circuit at 40 °C rated value":"45kW","at standard circuit at 50 °C rated value":"50hp","Finely Stranded Without Core End Processing":"2x (4 ... 35 mm²)","number of CO contacts for auxiliary contacts":"1","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"3","Type Of Voltage Of The Control Supply Voltage":"AC","at inside-delta circuit at 40 °C rated value":"90kW","at inside-delta circuit at 50 °C rated value":"100hp","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 ... 690V","at 690 V at standard circuit at 40 °C rated value":"75kW","contact rating of auxiliary contacts according to UL":"B300 / R300","Operating Voltage At Inside-Delta Circuit Rated Value":"400 ... 600V","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":"45W","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":"15A","Relative Negative Tolerance Of The Operating Voltage At Inside-Delta Circuit":"-15%","Relative Positive Tolerance Of The Operating Voltage At Inside-Delta Circuit":"10%"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/bc1a551ff310cba8a882eb3e39aca9de.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=88049&mlfb=3RW4426-3BC46"},"ai":{"faq":[{"question":"What is the maximum motor cable length for 3RW4426-3BC46?","answer":"The maximum motor cable length is 500 m. This applies to the total run between the soft starter and the motor; longer runs increase voltage drop and may affect starting torque."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4426-3BC46","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/3RW4426-3BC46 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}