{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4436-6BC35","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4436-6BC35","canonicalUrl":"https://aoctrl.com/siemens/3RW4436-6BC35","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4436-6BC35","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4436-6BC35 soft starter, 281 A at 40 °C, 690 V insulation voltage, 50/60 Hz, inside-delta circuit, thyristor-based, screw fixing, 170 x 200 x 270 mm.","salesMarkdown":"## Rated current and thermal derating — the real-world capacity The 3RW4436-6BC35: The 281 A rating at 40 °C is the baseline for matching the soft starter to the motor nameplate FLA, provided the enclosure ambient stays at or below 40 °C. For a panel sitting in a warm plant or near heat-generating gear, use the derated figure for the actual ambient — the thyristor junction temperature governs the safe operating envelope, not the 40 °C number. The operating frequency range of 50 to 60 Hz means the same unit works on either mains standard without adjustment. ## Inside-delta wiring and thyristor section This soft starter supports inside-delta circuit configuration, which lets the thyristors carry only the phase current rather than the line current — effectively reducing the required current rating of the power section when the motor windings are reconfigurable. The thyristor-based power stage has no mechanical contacts to wear, but the semiconductor junction temperature still sets the current limit; the derating curve above reflects that. ## Mounting and panel integration The unit measures 170 mm wide by 200 mm high by 270 mm deep and is secured by screw fixing. Mounting position allows a vertical surface with ±90° rotation and ±22.5° tilt front-to-back, which gives flexibility in dense panels — provided the clearance distances (100 mm upward, 75 mm downward, 5 mm at the side) are maintained for airflow and wiring access.","metaTitle":"Siemens 3RW4436-6BC35 SIRIUS Soft Starter, 281 A at 40 °C","metaDescription":"Siemens 3RW4436-6BC35 SIRIUS soft starter, 281 A rated at 40 °C, 690 V insulation, inside-delta circuit capable.","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":"3RW4436-6BC35","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 Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5536-6HA16<<","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 (20 ... 14)","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":"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":"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%","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":"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":"$7,115.81","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9af4b77418f7990e65d133355c28f20e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=498446&mlfb=3RW4436-6BC35"},"ai":{"faq":[{"question":"What is the 3RW4436-6BC35 rated current at 40 °C?","answer":"281 A at 40 °C. Derate to 251 A at 50 °C and 217 A at 60 °C for installations in warm enclosures."},{"question":"Does the 3RW4436-6BC35 support inside-delta wiring?","answer":"Yes, it is rated for inside-delta circuit configuration, which reduces the current demand on the thyristors when the motor windings are reconfigurable."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4436-6BC35","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/3RW4436-6BC35 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}}