{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4427-3BC36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4427-3BC36","canonicalUrl":"https://aoctrl.com/siemens/3RW4427-3BC36","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4427-3BC36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4427-3BC36 soft starter, 161 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass, adjustable current limitation, inside-delta circuit, screw fixing.","salesMarkdown":"## Current derating and thermal budget The 3RW4427-3BC36: Minimum load is 8 % of the rated current — below that the soft starter may not trigger the thyristors reliably, so check the motor magnetising current against this floor. ## Bypass and protection topology Integrated bypass contact system means the thyristors are shorted out after start, eliminating continuous conduction losses — the 161 A rating applies to the bypass path, not just the silicon. Built-in motor overload protection and intrinsic device protection reduce external relay count; adjustable current limitation lets you set the start ramp ceiling without a separate current-limiting reactor. ## Wiring and panel fit Envelope is 170 mm wide, 192 mm high, 270 mm deep — screw fixing, not DIN rail. Mounting position allows ±90° rotation and ±22.5° tilt front-to-back, which helps in tight retrofit cabinets. Clearance: 100 mm upward, 75 mm downward, 5 mm at the sides — the side gap is tight; forced airflow or a wider cabinet may be needed above 40 °C. ## Inside-delta wiring and motor lead length Inside-delta circuit configuration is supported — this places the soft starter in the delta legs of a six-lead motor, reducing the current rating needed by about 58 % compared to in-line wiring. Useful for retrofitting a smaller unit onto an existing motor. Maximum motor cable length is 500 m — beyond that, reflected wave voltage spikes at the motor terminals may exceed the thyristor blocking voltage, especially on 690 V systems. ## Environmental and compliance Pollution degree 3 per IEC 60947-4-2 — conductive pollution or dry non-conductive pollution that becomes conductive due to condensation is expected. The enclosure seal and internal creepage distances are designed for this. Storage temperature range -25 to +80 °C; operation up to 60 °C ambient. Insulation voltage rated 690 V, operating frequency 50/60 Hz.","metaTitle":"Siemens 3RW4427-3BC36 SIRIUS Soft Starter, 161 A, 690 V","metaDescription":"Siemens 3RW4427-3BC36 SIRIUS soft starter, 161 A at 40 °C, 690 V insulation, 50/60 Hz. 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":"3RW4427-3BC36","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: 82 A, 75 hp Inside-delta: 142 A, 125 hp 400-690 V AC, 115 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5527-3HA16<<","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":"161A","at 50 °C rated value":"142A","at 60 °C rated value":"125A","For Auxiliary Contacts":"2x (24 ... 16)","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":"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":"55kW","at standard circuit at 50 °C rated value":"75hp","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":"110kW","at inside-delta circuit at 50 °C rated value":"125hp","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 ... 690V","at 690 V at standard circuit at 40 °C rated value":"90kW","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":"55W","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":"18A","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/f1c83b3fad163120b0ed172f06af9d6a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=41810&mlfb=3RW4427-3BC36"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for 3RW4427-3BC36?","answer":"Typical Siemens documentation for this series includes a CE declaration, UKCA, and UL file; confirm the specific certificate bundle with the order."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4427-3BC36","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/3RW4427-3BC36 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}}