{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4427-1BC46","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4427-1BC46","canonicalUrl":"https://aoctrl.com/siemens/3RW4427-1BC46","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4427-1BC46","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4427-1BC46 soft starter, 161 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass contact, thyristor-based, screw fixing.","salesMarkdown":"## Current ratings that decide the motor match The 3RW4427-1BC46: Rated 161 A at 40 °C, derating to 142 A at 50 °C and 125 A at 60 °C. The 40 °C figure is the baseline — above that, the thyristor junction temperature limits the continuous current. For a motor nameplate of 150 A FLA in a 40 °C ambient, this unit holds headroom; in a 50 °C panel, the 142 A ceiling still covers most 132 kW (400 V) machines. The 8% minimum load setting means it handles lightly loaded conveyors or pumps without dropping out. ## Integrated bypass and wiring constraints An integrated bypass contact system means the thyristors are shorted out once the motor reaches full speed — no external bypass contactor needed, and the heat load in the panel drops to near zero during run. The main circuit uses box terminals accepting stranded 4–50 mm² or solid 0.5–2.5 mm². Control and auxiliary circuits use screw-type terminals sized for 20–14 AWG. Maximum motor cable length is 500 m — beyond that, reflected wave spikes on the cable can stress the thyristor stack. ## Mounting and clearance for panel layout Screw fixing to a vertical mounting surface, with ±90° rotation and ±22.5° tilt front/back allowed. Dimensions: 170 mm wide, 192 mm high, 270 mm deep. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides — the top clearance is the critical one for heat plume rise from the heatsink. Pollution degree 3 per IEC 60947-4-2 means it's rated for the conductive-dust environment typical of industrial panels. ## Inside-delta wiring and adjustable current limit Supports inside-delta circuit connection — the soft starter sits in the delta legs of a six-lead motor, reducing the per-phase current the thyristors carry by a factor of √3 compared to in-line wiring. Adjustable current limitation lets you set the start current between the motor's no-load and locked-rotor values, which is useful for conveyors that need a controlled acceleration ramp without tripping upstream protection. Motor overload protection is built in, so a separate overload relay is not required. ## Control supply and fault indication The unit has a display for fault signals and supports external reset — useful for remote reset in an unmanned conveyor zone. Storage temperature range is -25 to +80 °C; during operation the ambient must stay at or below 60 °C. Derating temperature threshold is 40 °C — above that, the output current must be reduced per the derating curve.","metaTitle":"Siemens 3RW4427-1BC46 SIRIUS Soft Starter, 161 A at 40 °C","metaDescription":"Siemens 3RW4427-1BC46 SIRIUS soft starter, 161 A at 40 °C, 690 V insulation, integrated bypass. Active production, sourced to order. Request a quote.","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":"3RW4427-1BC46","Height":"192mm","Upwards":"100mm","Stranded":"2x (4 ... 50 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 690 V, 40 °C standard: 93 A, 90 kW Inside-delta: only up to 600 V 400-690 V AC, 230 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":"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":"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/5842bfefeb95a7a23b4955a6f51c040b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=75726&mlfb=3RW4427-1BC46"},"ai":{"faq":[{"question":"What compliance documentation is available for the 3RW4427-1BC46?","answer":"The evidence does not list specific compliance marks (RoHS, REACH, UL, IEC) for this order code. The product is designed to IEC 60947-4-2 (pollution degree 3) and carries the SIRIUS brand. Compliance documentation should be confirmed at RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4427-1BC46","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/3RW4427-1BC46 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}}