{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4436-2BC35","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4436-2BC35","canonicalUrl":"https://aoctrl.com/siemens/3RW4436-2BC35","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4436-2BC35","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4436-2BC35 soft starter, 281 A at 40 °C, 690 V insulation voltage, 50/60 Hz, inside-delta circuit, adjustable current limitation, pollution degree 3.","salesMarkdown":"The 3RW4436-2BC35: Sourced through authorized distribution channels against your BOM quantity. ## 281 A at 40 °C — thermal derating drives the real rating The 40 °C figure is the catalog rating; the 50 °C and 60 °C values are what govern in a warm panel or near a motor. Derating temperature threshold is 40 °C — above that, the continuous current drops linearly. If your enclosure ambient runs at 50 °C, budget for 251 A continuous, not 281 A. ## Inside-delta wiring and adjustable current limit Supports inside-delta circuit connection, which reduces the current through each thyristor leg to 58% of the line current. Useful for larger motors where the soft starter frame size can be dropped one step. Adjustable current limitation lets you set the start current between 8% and 100% of the rated motor current. The minimum load threshold is 8% — below that the starter may not detect the load correctly. ## Panel fit: 270 mm deep, screw fixing, pollution degree 3 Dimensions are 270 mm depth × 170 mm width × 200 mm height. Mounting is screw fixing with a vertical mounting surface, rotatable ±90° and tiltable ±22.5° front-to-back — not a DIN-rail snap-on. Pollution degree 3 per IEC 60947-4-2 means it is rated for conductive pollution in industrial atmospheres — no additional conformal coating needed for typical panel environments. Clearance requirements: 100 mm upwards, 75 mm downwards, 5 mm at the sides. The side clearance is tight; the vertical clearance is where the heat rises. ## Wiring: main circuit and control connections Main circuit connection accepts stranded 25–120 mm², finely stranded 16–95 mm², or busbar connection. For the busbar option, the front and back clamping points each take 6–2/0 AWG; using both clamping points accepts up to 2× 1/0 AWG. Auxiliary control wiring uses solid 2× (0.25–1.5 mm²) or finely stranded 2× (24–16 AWG). Maximum wire length from the starter to the motor is 500 m — beyond that, voltage drop and cable capacitance may affect thyristor firing.","metaTitle":"Siemens 3RW4436-2BC35 SIRIUS Soft Starter, 281 A, 690 V","metaDescription":"Siemens 3RW4436-2BC35 SIRIUS soft starter, 281 A at 40 °C, 690 V insulation voltage. 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":"3RW4436-2BC35","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: 145 A, 125 hp Inside-delta: 251 A, 250 hp 400-600 V AC, 115 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5536-2HA16<<","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":"281A","at 50 °C rated value":"251A","at 60 °C rated value":"217A","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":"110kW","at standard circuit at 50 °C rated value":"125hp","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":"200kW","at inside-delta circuit at 50 °C rated value":"250hp","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":"95W","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":"32A","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/fb8b575b26c151b9aa87277a141b7216.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=537898&mlfb=3RW4436-2BC35"},"ai":{"faq":[{"question":"What is the 3RW4436-2BC35 rated current at 50 °C?","answer":"251 A at 50 °C ambient, down from 281 A at 40 °C. The 60 °C rating is 217 A. Use the temperature that matches your enclosure ambient."},{"question":"Does the 3RW4436-2BC35 support inside-delta wiring?","answer":"Yes, inside-delta circuit connection is supported. This reduces the current per thyristor leg to 58% of line current, allowing a smaller frame size for larger motors."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4436-2BC35","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/3RW4436-2BC35 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}}