{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4458-2BC44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4458-2BC44","canonicalUrl":"https://aoctrl.com/siemens/3RW4458-2BC44","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4458-2BC44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4458-2BC44 soft starter, 1680 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass, inside-delta circuit, screw fixing.","salesMarkdown":"## 1680 A at 40 °C — the current rating that drives the motor spec The 3RW4458-2BC44: That 1680 A figure is the continuous motor full-load current the unit can start and run through the bypass — not a transient surge rating. With an integrated bypass contact system, the thyristors are shorted out once the motor reaches full speed, eliminating the heat load on the semiconductors during continuous running. This means the 1680 A rating is sustainable without external bypass contactors or additional panel cooling. ## Inside-delta wiring and adjustable current limit — tuning for the supply Inside-delta circuit connection is supported, which lets the soft starter handle a given motor current with lower-rated thyristors by connecting across the motor windings rather than in the supply lines. This is a panel-wiring decision, not a firmware setting — the motor leads must be brought back to the starter terminals. Adjustable current limitation lets you cap the starting inrush at a percentage of the motor FLA, useful when starting against a weak supply transformer or when the generator set has limited overload capacity. The minimum load threshold is 8 %, meaning the starter can reliably detect and control loads down to that level. ## Motor overload and device protection — one unit, fewer relays Motor overload protection is built in, along with intrinsic device protection that guards the thyristors against over-temperature and over-current. This reduces the component count in the motor control centre — no separate thermal overload relay or electronic motor protection relay needed for most applications. The external reset input and display for fault signals mean the starter can be integrated into a remote reset circuit and the fault code read locally without a separate HMI. Pollution degree 3 per IEC 60947-4-2 confirms the creepage distances are designed for conductive dust environments typical in cement, mining, and steel mills. ## Mounting and panel integration — 640 x 510 x 290 mm, screw-fixed The unit measures 640 mm high, 510 mm wide, and 290 mm deep, with screw fixing to the mounting surface. The mounting position allows vertical surface mounting with +/-90° rotation and +/-22.5° tilt forward/backward — useful when the panel layout forces an angled installation. Clearance requirements: 100 mm above, 75 mm below, and 5 mm at the sides for airflow and cable bending radius. The SIRIUS brand is Siemens' flagship soft starter family, so the 3RW4458-2BC44 sits in a well-supported product line with ongoing firmware updates and accessory availability.","metaTitle":"Siemens 3RW4458-2BC44 SIRIUS Soft Starter, 1680 A at 40 °C","metaDescription":"Siemens 3RW4458-2BC44 SIRIUS soft starter, rated 1680 A at 40 °C. Active production. Integrated bypass, inside-delta capable. Quoted to order against RFQ.","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":"3RW4458-2BC44","Height":"640mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 400 V, 40 °C standard: 970 A, 560 kW Inside-delta: 1680 A, 1000 kW 200-460 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5556-2HA14<<","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":"230V","at 60 Hz rated value":"230V","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":"560kW","at standard circuit at 50 °C rated value":"750hp","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 000kW","at inside-delta circuit at 50 °C rated value":"1 300hp","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%","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/18a23469e69f18aa24de512b7e2a0675.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=238501&mlfb=3RW4458-2BC44"},"ai":{"faq":[{"question":"What is the lead time and how can I order the 3RW4458-2BC44?","answer":"Submit an RFQ for the specific quantity and delivery window."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4458-2BC44","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/3RW4458-2BC44 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}}