{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4458-2BC36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4458-2BC36","canonicalUrl":"https://aoctrl.com/siemens/3RW4458-2BC36","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4458-2BC36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4458-2BC36 soft starter, 1680 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass, screw fixing.","salesMarkdown":"## 1680 A at 40 °C — the rating that decides panel fit The 3RW4458-2BC36: That 40 °C figure is the baseline for sizing the panel ventilation and the upstream feeder — if the enclosure ambient runs hotter, the available motor current drops by roughly 12 % per 10 °C rise. ## Mounting and wiring — what the enclosure needs Mounting is screw fixing with a vertical surface orientation; the unit can be rotated ±90° or tilted ±22.5° front/back. Dimensions are 510 mm wide × 640 mm high × 290 mm deep — that's a large-frame soft starter, so the enclosure depth needs to clear the 290 mm plus cable bending radius. Main circuit connection is via busbar (stranded 70–240 mm² or 2/0–500 kcmil). The main lugs are sized for high-current cable — plan for compression lugs and a torque wrench. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides. The 500 m maximum wire length to the motor matters for long cable runs — voltage drop and reflected wave effects need checking at that distance. ## Protection and control features Built-in motor overload protection and intrinsic device protection are standard. Adjustable current limitation lets you set the start current between 8 % and 100 % of the rated current — useful for soft-starting conveyors or pumps without tripping upstream breakers. Supports inside-delta connection for six-wire motors, which reduces the line current draw during start. An external reset input and a display for fault signals are included — the display shows the trip code so you don't need a separate HMI to diagnose a jam. Pollution degree 3 per IEC 60947-4-2 means it's rated for industrial environments with conductive dust or occasional condensation — no derating needed for typical factory-floor conditions.","metaTitle":"Siemens 3RW4458-2BC36 SIRIUS Soft Starter, 1680 A","metaDescription":"Siemens SIRIUS 3RW4458-2BC36 soft starter, 1680 A at 40 °C, 690 V insulation, 50/60 Hz. Current production. Quoted to order against BOM.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"290mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"510mm","title":"3RW4458-2BC36","Height":"640mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 575 V, 50 °C standard: 850 A, 950 hp Inside-delta: 1472 A, 1650 hp 400-690 V AC, 115 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5556-2HA16<<","During Storage":"-25 ... +80°C","External Reset":"Yes","Finely Stranded":"50 ... 240 mm²","lifecycle_stage":"current","During Operation":"60°C","Fastening Method":"screw fixing","Minimum Load [%]":"8%","For Main Contacts":"2/0 ... 500 kcmil","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":"1 680A","at 50 °C rated value":"1 472A","at 60 °C rated value":"1 316A","For Auxiliary Contacts":"2x (24 ... 16)","For Main Current Circuit":"busbar connection","Motor Overload Protection":"Yes","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Insulation Voltage Rated Value":"690V","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":"710kW","at standard circuit at 50 °C rated value":"950hp","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":"1 200kW","at inside-delta circuit at 50 °C rated value":"1 650hp","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":"1 000kW","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":"270W","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":"194A","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/035ebd0dcad0e8575977c4950ba35029.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=220623&mlfb=3RW4458-2BC36"},"ai":{"faq":[{"question":"What is the 3RW4458-2BC36 rated current at different temperatures?","answer":"Rated 1680 A at 40 °C, derating to 1472 A at 50 °C and 1316 A at 60 °C ambient."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4458-2BC36","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/3RW4458-2BC36 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}