{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4426-1BC46","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4426-1BC46","canonicalUrl":"https://aoctrl.com/siemens/3RW4426-1BC46","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4426-1BC46","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4426-1BC46 soft starter, 133 A at 40 °C, 690 V insulation voltage, integrated bypass contact system, inside-delta circuit capable, screw-type terminals.","salesMarkdown":"## 133 A at 40 °C — the current that drives the panel placement The 3RW4426-1BC46: That 40 °C figure is the baseline for sizing the soft starter against the motor full-load current; if the panel ambient runs hotter, the usable current drops accordingly. The soft starter only conducts during start/stop; the bypass carries the full-load current in steady state. Inside-delta circuit capability means the soft starter can be wired in the delta legs of a delta-connected motor, reducing the current rating required from the soft starter to 58% of the motor FLA. Confirm the motor winding configuration before specifying this wiring method. ## Mounting and terminal specs for the panel build Dimensions are 270 mm deep, 170 mm wide, 192 mm high. The mounting position allows vertical surface with ±90° rotation and ±22.5° tilt front-to-back, giving flexibility in tight enclosures. Screw fixing is the fastening method. Clearance requirements: 100 mm upwards, 75 mm downwards, 5 mm at the sides. These are the minimum air gaps for cooling airflow and arc flash containment — respect them in the gland plate layout. Maximum wire length to the motor is 500 m. ## Active production — sourcing for the BOM line No stock-holding claim is made; each order is validated per the build schedule. ## Protection and control features for the motor circuit Motor overload protection and intrinsic device protection are both integrated. Adjustable current limitation lets the starting current be set between 0 and the rated value, protecting both the motor and the driven load during acceleration. Minimum load is 8% of the soft starter rating — below this the motor current may not be reliably detected. The display provides fault signal readout for diagnostics. External reset is supported for remote restart after a trip. Degree of pollution 3 per IEC 60947-4-2 means the unit is rated for conductive pollution environments typical in industrial panels without climate control.","metaTitle":"Siemens 3RW4426-1BC46 SIRIUS Soft Starter, 133 A at 40 °C","metaDescription":"Siemens 3RW4426-1BC46 SIRIUS soft starter, 133 A at 40 °C, 690 V insulation, integrated bypass. Active production, quoted to order. RFQ for availability.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"270mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"170mm","title":"3RW4426-1BC46","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 Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5526-1HA16<<","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 (20 ... 14)","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":"screw-type 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 (0.5 ... 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%","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":"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/4510bbae6107a27837b890adc1b2fe4f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=390313&mlfb=3RW4426-1BC46"},"ai":{"faq":[{"question":"What is the current rating of the 3RW4426-1BC46 at different ambient temperatures?","answer":"The soft starter is rated 133 A at 40 °C, derating to 118 A at 50 °C and 102 A at 60 °C. The 40 °C figure is the baseline for sizing against motor full-load current."},{"question":"What are the mounting clearances required for the 3RW4426-1BC46?","answer":"Minimum clearances are 100 mm upwards, 75 mm downwards, and 5 mm at the sides."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4426-1BC46","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/3RW4426-1BC46 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}}