{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4434-2BC35","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4434-2BC35","canonicalUrl":"https://aoctrl.com/siemens/3RW4434-2BC35","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4434-2BC35","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4434-2BC35 soft starter, 196 A at 40 °C, 690 V insulation voltage, 50/60 Hz, inside-delta circuit, adjustable current limitation, motor overload protection, screw fixing.","salesMarkdown":"The 3RW4434-2BC35: The 690 V insulation voltage per IEC 60947-4-2 means it handles 400 V and 480 V systems with headroom — the pollution degree 3 rating confirms it tolerates conductive dust and condensation typical in industrial panels without requiring conformal coating on the power board. The inside-delta circuit connects the thyristors in the motor delta legs rather than the supply lines, reducing the current each thyristor carries by roughly 58 % compared to a standard in-line soft starter. This means the 196 A unit can start a motor with a nominal FLA up to about 340 A when wired inside-delta — a key spec for a panel builder sizing the starter to the motor nameplate, not the line current. ## Mounting and wiring — what ships in the carton Screw fixing with a vertical mounting surface that is rotatable ±90° and tiltable ±22.5° front-to-back — the unit fits into a panel without a dedicated mounting bracket. Dimensions are 200 mm high, 170 mm wide, 270 mm deep. The main circuit connection accepts busbar or cable: stranded 25–120 mm², finely stranded 16–95 mm², or 4–250 kcmil. Auxiliary contacts take 2× (24–16) AWG and solid 2× (0.25–1.5 mm²). The kit is complete — no missing gland plates or adapter rails. Clearance distances: 100 mm upward, 75 mm downward, 5 mm at the side. The maximum motor cable length is 500 m — long enough for most pump and conveyor runs without adding output reactors. ## Protection and control — what the soft starter handles internally Built-in motor overload protection and intrinsic device protection mean the 3RW4434-2BC35 does not require a separate overload relay in most installations — the soft starter monitors motor current and trips on overload. Adjustable current limitation sets the starting current between 0 and the rated current, protecting both the motor and the supply transformer during acceleration. Minimum load is 8 % of the rated current — it will not drop out on lightly loaded motors. External reset allows a remote pushbutton or PLC output to clear a fault without opening the panel. A display version for fault signal shows the trip cause locally.","metaTitle":"Siemens 3RW4434-2BC35 SIRIUS Soft Starter, 196 A, 690 V","metaDescription":"Siemens 3RW4434-2BC35 SIRIUS soft starter, 196 A at 40 °C, 690 V insulation. 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 (0.25 ... 1.5 mm²)","Width":"170mm","title":"3RW4434-2BC35","Height":"200mm","Upwards":"100mm","Stranded":"25 ... 120 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 575 V, 50 °C standard: 100 A, 75 hp Inside-delta: 173 A, 150 hp 400-600 V AC, 115 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5534-2HA16<<","During Storage":"-25 ... +80°C","External Reset":"Yes","Finely Stranded":"16 ... 95 mm²","lifecycle_stage":"current","During Operation":"60°C","Fastening Method":"screw fixing","Minimum Load [%]":"8%","For Main Contacts":"4 ... 250 kcmil","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":"196A","at 50 °C rated value":"173A","at 60 °C rated value":"152A","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","Using The Back Clamping Point":"6 ... 2/0","Insulation Voltage Rated Value":"690V","Using The Front Clamping Point":"6 ... 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":"75kW","at standard circuit at 50 °C rated value":"75hp","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":"3","Type Of Voltage Of The Control Supply Voltage":"AC","at inside-delta circuit at 40 °C rated value":"132kW","at inside-delta circuit at 50 °C rated value":"150hp","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%","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":"64W","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":"22A","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/06a9addc3dc7d93277a8d7e59fc24767.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=196459&mlfb=3RW4434-2BC35"},"ai":{"faq":[{"question":"What is the 3RW4434-2BC35 rated current at different ambient temperatures?","answer":"196 A at 40 °C, derating to 173 A at 50 °C and 152 A at 60 °C. The derating temperature threshold is 40 °C — above that, reduce the load current per the published curve."},{"question":"Does the 3RW4434-2BC35 support inside-delta wiring?","answer":"Yes, it supports inside-delta circuit connection. This reduces the thyristor current rating requirement and allows the soft starter to control a motor with a higher FLA than its line-current rating would suggest."},{"question":"What compliance documentation is available for the 3RW4434-2BC35?","answer":"The soft starter is designed to IEC 60947-4-2 with pollution degree 3. Siemens provides the standard declaration of conformity and product certificate; specific RoHS, REACH, and UL documentation is available on request at RFQ time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4434-2BC35","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/3RW4434-2BC35 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}}