{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4427-1BC34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4427-1BC34","canonicalUrl":"https://aoctrl.com/siemens/3RW4427-1BC34","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4427-1BC34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4427-1BC34 soft starter, 161 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass, screw terminals, 170 x 192 x 270 mm.","salesMarkdown":"## Rated current and thermal derating The 3RW4427-1BC34: At a 40 °C ambient the soft starter delivers 161 A continuous. That drops to 142 A at 50 °C and to 125 A at 60 °C — the derating curve matters when the starter sits in a crowded panel or near a heat source. The derating temperature is 40 °C, meaning the full 161 A rating holds only up to that ambient; above it you must reduce the load current per the published curve. ## Integrated bypass and inside-delta wiring An integrated bypass contact system means the thyristors are shorted out once the motor reaches full speed, eliminating SCR conduction losses during run time and reducing heat in the enclosure. Inside-delta circuit capability allows the starter to be wired in the motor delta connection — this reduces the current through the starter to 58% of the line current, effectively extending the current range of the unit for a given motor. ## Adjustable current limit and minimum load The adjustable current limitation lets you set a peak current ceiling during start, protecting both the motor and the supply from high inrush. The minimum load is 8% of the rated current, so the starter can handle lightly loaded motors without tripping or misfiring. ## Panel fit and wiring terminals Dimensions are 170 mm wide, 192 mm high, and 270 mm deep. Screw fixing with a vertical mounting surface — the enclosure can be rotated ±90° or tilted ±22.5° front-to-back, giving flexibility in tight cabinets. The box terminal design on the main circuit provides a reliable, high-torque connection.","metaTitle":"Siemens 3RW4427-1BC34 SIRIUS Soft Starter, 161 A at 40 °C","metaDescription":"Siemens 3RW4427-1BC34 SIRIUS soft starter, 161 A at 40 °C, 690 V insulation, integrated bypass, adjustable current limit. 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 (0.5 ... 2.5 mm²)","Width":"170mm","title":"3RW4427-1BC34","Height":"192mm","Upwards":"100mm","Stranded":"2x (4 ... 50 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 460 V, 50 °C standard: 82 A, 60 hp Inside-delta: 142 A, 100 hp 200-460 V AC, 115 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":"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":"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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3b6addec09890296a93b0927e9e84eb4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=282867&mlfb=3RW4427-1BC34"},"ai":{"faq":[{"question":"How do I get current pricing and availability for the 3RW4427-1BC34?","answer":"Pricing and stock are confirmed at quote time against an RFQ. Submit a request with your target quantity and delivery window; the sourcing desk will return a firm quote with lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4427-1BC34","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/3RW4427-1BC34 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}}