{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4426-1BC35","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4426-1BC35","canonicalUrl":"https://aoctrl.com/siemens/3RW4426-1BC35","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4426-1BC35","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4426-1BC35 soft starter, 133 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass contact system, inside-delta circuit capable, screw-type terminals.","salesMarkdown":"## Rated current and thermal derating The 3RW4426-1BC35 is rated 133 A at 40 °C ambient. At 50 °C the rating drops to 118 A, and at 60 °C it is 102 A. The derating temperature is 40 °C — above that, the continuous output current must be reduced per the datasheet curve. For a 60 °C panel environment, budget the 102 A figure as the usable ceiling. ## Integrated bypass and inside-delta wiring An integrated bypass contact system is built in — once the motor reaches full speed, the thyristors are shorted, eliminating heat dissipation in the power module during run. The unit also supports inside-delta circuit wiring, which reduces the current through the soft starter to 58% of the line current, effectively extending the motor current range the same hardware can handle. ## Mounting dimensions and clearances The enclosure measures 192 mm high, 170 mm wide, and 270 mm deep. Required clearances: 100 mm above, 75 mm below, and 5 mm at the sides. These gaps are for airflow — the thyristor heatsink needs that volume to stay within the 60 °C operating limit. ## Terminal sizes and wire range Main current circuit terminals are box-type, accepting 2x (4... 50 mm²) stranded or 2x (10... 1/0 AWG) using both clamping points. Maximum wire length from the soft starter to the motor is 500 m — beyond that, voltage drop and cable capacitance may affect thyristor commutation. ## Protection and control features Motor overload protection is built in, along with intrinsic device protection that monitors thyristor temperature and line-side conditions. Adjustable current limitation lets the user set the start current between 8% and 100% of the rated motor current — the minimum load is 8%. An external reset input and a display for fault signals are standard. ## Voltage and frequency ratings Insulation voltage is rated 690 V, and the operating frequency covers 50... 60 Hz. ## Storage and operating temperature During operation the ambient limit is 60 °C; storage range is -25... +80 °C. The unit is designed for a 40 °C derating baseline — above that, the current ratings in the spec table apply.","metaTitle":"Siemens 3RW4426-1BC35 SIRIUS Soft Starter, 133A, 690V","metaDescription":"Siemens 3RW4426-1BC35 SIRIUS soft starter, 133A at 40°C, 690V insulation, integrated bypass, inside-delta ready. Active production, quoted to order.","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":"3RW4426-1BC35","Height":"192mm","Upwards":"100mm","Stranded":"2x (4 ... 50 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 575 V, 50 °C standard: 68 A, 50 hp Inside-delta: 118 A, 100 hp 400-600 V AC, 115 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":"115V","at 60 Hz rated value":"115V","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 ... 600V","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":"$4,085.59","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d268b5609cdfeb06d85b9235e83ccead.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=205248&mlfb=3RW4426-1BC35"},"ai":{"faq":[{"question":"What is 3RW4426-1BC35's listed depth?","answer":"The depth is 270 mm. Overall dimensions are 192 mm high by 170 mm wide."},{"question":"What wire sizes does the 3RW4426-1BC35 accept?","answer":"Main circuit box terminals accept 2x (4... 50 mm²) stranded or 2x (10... 1/0 AWG)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4426-1BC35","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/3RW4426-1BC35 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}}