{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4427-1BC36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4427-1BC36","canonicalUrl":"https://aoctrl.com/siemens/3RW4427-1BC36","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4427-1BC36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4427-1BC36 soft starter, 161 A at 40 °C, 690 V insulation voltage, integrated bypass contact system, thyristor-controlled, 50/60 Hz.","salesMarkdown":"The 3RW4427-1BC36: This SIRIUS soft starter is rated 161 A at 40 °C ambient — that is the full-load current it can start continuously without derating. Push the ambient to 50 °C and the continuous rating drops to 142 A; at 60 °C it falls to 125 A. The 40 °C baseline is the one to size against for a standard 40 °C panel environment. The integrated bypass contact system means the thyristors are shorted out once the motor reaches full speed, eliminating SCR conduction losses in steady-state. That keeps the enclosure cooler and lets the soft starter sit closer to other heat-generating gear on the DIN rail. Minimum load is 8 % of the rated current — so this unit handles lightly loaded conveyors or pumps without dropping out of regulation. Below that threshold the SCR firing angle may not maintain a clean output. ## Mounting, clearances, and wiring — panel-fit constraints The unit measures 170 mm wide by 192 mm high by 270 mm deep, fastened with screw fixing. It needs 100 mm clearance above, 75 mm below, and only 5 mm at the sides — tight side-by-side packing is fine, but the vertical airflow path must stay open. Mounting position is flexible: vertical surface with ±90° rotation and ±22.5° tilt forward/back. That covers most panel layouts without special brackets. Main circuit terminals are box lugs accepting 2x (4 … 50 mm²) stranded or 2x (10 … 1/0 AWG) using both clamping points. The back and front clamping points each take 10 … 2/0 AWG. Maximum motor cable length is 500 m — adequate for most installations but worth checking on long runs where capacitive charging current might nuisance-trip the overload protection. ## Protection and control features Built-in motor overload protection and intrinsic device protection are standard — no separate overload relay needed. Adjustable current limitation lets you cap inrush to a multiple of the motor FLA, useful on weak supplies or generators. The unit supports inside-delta wiring (six-wire connection), which reduces the current through each SCR leg by 58 % compared to standard three-wire. That extends the current range of the same hardware into larger motors without stepping up the frame size. Pollution degree 3 per IEC 60947-4-2 means it is rated for industrial environments with conductive dust or occasional condensation — no need for a sealed enclosure in a typical panel. Operating frequency covers 50 … 60 Hz — same unit for either grid standard. Sourced through independent distribution channels against an RFQ. No stock-holding claim — quoted per order.","metaTitle":"Siemens 3RW4427-1BC36 SIRIUS Soft Starter, 161 A, 690 V","metaDescription":"Active-production Siemens SIRIUS soft starter 3RW4427-1BC36, 161 A at 40 °C, 690 V insulation, integrated bypass. Quoted to order against BOM quantities.","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":"3RW4427-1BC36","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 Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5527-1HA16<<","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":"161A","at 50 °C rated value":"142A","at 60 °C rated value":"125A","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":"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%","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":"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/2267f2e7bd3a8f819f10ed9342b4d6fb.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=109739&mlfb=3RW4427-1BC36"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for 3RW4427-1BC36?","answer":"The evidence does not list specific RoHS, REACH, UL, or IEC certificates for this order code. As a current-production SIRIUS product, it carries CE marking for the European market and is designed to IEC 60947-4-2 (pollution degree 3). Full compliance documentation is available from Siemens upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4427-1BC36","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/3RW4427-1BC36 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}}