{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4427-1BC44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4427-1BC44","canonicalUrl":"https://aoctrl.com/siemens/3RW4427-1BC44","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4427-1BC44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4427-1BC44 soft starter, 161 A at 40 °C, 690 V insulation, screw fixing, integrated bypass, thyristor-switched.","salesMarkdown":"The Siemens SIRIUS 3RW4427-1BC44 is a soft starter — thyristor-switched, with an integrated bypass contact system that takes the thyristors out of the circuit once the motor is at full speed, reducing heat dissipation in the panel. Rated 161 A at 40 °C, it handles motor starts up to that current in standard industrial environments; derate to 142 A at 50 °C and 125 A at 60 °C if your enclosure runs hot. The 8 % minimum load spec means it won't regulate smoothly below that threshold; if your motor draws less than about 13 A, this starter will struggle to control the ramp. Mounting flexibility: vertical surface, rotatable ±90°, tiltable ±22.5° front-to-back. That covers most panel layouts, but the screw-fixing method means you're drilling or using a mounting plate — no DIN-rail snap-on here. The thyristor stack and bypass contactor are one assembly, so swap time is the same as any similarly sized soft starter — expect to land it against an RFQ. ## Integration notes Dimensions: 170 mm wide, 192 mm high, 270 mm deep. Clearance: 100 mm above, 75 mm below, 5 mm at the sides — that 5 mm side gap is tight; plan for at least 10 mm if you're running larger cables. Main circuit terminals are box terminals accepting 2x (4... 50 mm²) stranded or 2x (10... 1/0) AWG using both clamping points. Auxiliary and control circuit terminals are screw-type, 2x (0.5... 2.5 mm²) solid. Wire length max 500 m — fine for most motor runs, but check if your motor is more than 500 m from the starter. Motor overload protection and intrinsic device protection are built in. Adjustable current limitation is standard, and the external reset input means you can wire a remote reset button into the control circuit.","metaTitle":"Siemens SIRIUS 3RW4427-1BC44 Soft Starter, 161A at 40°C","metaDescription":"Siemens SIRIUS 3RW4427-1BC44 soft starter, 161 A rated at 40 °C, 690 V insulation, integrated bypass, thyristor-switched. Current production. RFQ for pricing and lead time.","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":"3RW4427-1BC44","Height":"192mm","Upwards":"100mm","Stranded":"2x (4 ... 50 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 400 V, 40 °C standard: 93 A, 45 kW Inside-delta: 161 A, 90 kW 200-460 V AC, 230 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5527-1HA14<<","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":"230V","at 60 Hz rated value":"230V","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":"45kW","at standard circuit at 50 °C rated value":"60hp","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":"90kW","at inside-delta circuit at 50 °C rated value":"100hp","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":"200 ... 460V","contact rating of auxiliary contacts according to UL":"B300 / R300","Operating Voltage At Inside-Delta Circuit Rated Value":"200 ... 460V","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":"$1,997.00 – $3,883.66","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0a91f420b5c41a8ab0f808f77b841836.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=247678&mlfb=3RW4427-1BC44"},"ai":{"faq":[{"question":"What are the key ratings for this soft starter?","answer":"Rated 161 A at 40 °C, 690 V insulation voltage, 50/60 Hz operating frequency. Integrated bypass and thyristor-switched. Minimum load is 8 % of the rated current."},{"question":"What are the mounting and clearance requirements?","answer":"Screw fixing on a vertical surface. Dimensions: 170 mm wide, 192 mm high, 270 mm deep. Clearances: 100 mm above, 75 mm below, 5 mm at the sides."},{"question":"Does this soft starter have an integrated bypass?","answer":"Yes, it includes an integrated bypass contact system that takes the thyristors out of the circuit after the motor reaches full speed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4427-1BC44","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/3RW4427-1BC44 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}}