{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4424-1BC35","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4424-1BC35","canonicalUrl":"https://aoctrl.com/siemens/3RW4424-1BC35","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4424-1BC35","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4424-1BC35 soft starter, 81 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass, screw terminals, 170 x 192 x 270 mm.","salesMarkdown":"## 81 A at 40 °C, integrated bypass, inside-delta ready The 3RW4424-1BC35: It carries an integrated bypass contact system that eliminates the power dissipation of the thyristors once the motor is at full speed, so the enclosure heat load drops to the bypass contact resistance rather than the semiconductor forward drop. The unit supports inside-delta circuit wiring, which lets the starter control a motor wound for delta connection using a lower current rating than a standard in-line configuration — useful when the motor terminals are accessible and the panel space is tight. ## Current derating and thermal budget Rated current drops from 81 A at 40 °C to 73 A at 50 °C and 64 A at 60 °C. The derating temperature is 40 °C, meaning the full 81 A is available only up to that ambient; above it the output must be reduced per the curve. Maximum operating temperature is 60 °C, with storage from -25 to +80 °C. Minimum load is 8 % of the rated current — below that the soft starter may not reliably detect the motor current zero-crossing for thyristor gating. The maximum motor cable length is 500 m, which limits the cable charging current that can interfere with the current measurement. ## Mounting, clearances, and terminal wiring Dimensions are 170 mm wide, 192 mm high, 270 mm deep. Fastening is by screw fixing, not DIN rail snap-on — plan for four mounting holes in the back panel. Mounting position allows vertical surface with +/-90° rotation and +/-22.5° tilt front-to-back, giving flexibility in tight cabinets. Required clearances: 100 mm above, 75 mm below, 5 mm at the sides. Main current circuit uses box terminals accepting 2x (4... 50 mm²) stranded or 2x (10... 1/0) AWG using both clamping points. The back and front clamping points each accept 10... 2/0 AWG. ## Protection and control features Motor overload protection is built in, along with intrinsic device protection that monitors the thyristor junction temperature and adjusts the start profile to prevent overtemperature. Adjustable current limitation lets the user set the start current between the minimum load and the rated current. Fault indication is via a display (not just LEDs), showing the fault code directly. External reset input allows remote clearing of a tripped condition without opening the panel door.","metaTitle":"Siemens 3RW4424-1BC35 SIRIUS Soft Starter, 81A, 690V","metaDescription":"Siemens 3RW4424-1BC35 SIRIUS soft starter, 81A at 40°C, 690V insulation voltage. Active production, integrated bypass. Quoted to order against RFQ.","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":"3RW4424-1BC35","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: 42 A, 30 hp Inside-delta: 73 A, 60 hp 400-600 V AC, 115 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5524-1HA16<<","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":"81A","at 50 °C rated value":"73A","at 60 °C rated value":"64A","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":"30kW","at standard circuit at 50 °C rated value":"30hp","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":"45kW","at inside-delta circuit at 50 °C rated value":"60hp","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":"32W","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":"9A","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/f0732ff798cb77c0885f8062772d2a20.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=338185&mlfb=3RW4424-1BC35"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4424-1BC35","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/3RW4424-1BC35 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}}