{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4458-6BC34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4458-6BC34","canonicalUrl":"https://aoctrl.com/siemens/3RW4458-6BC34","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4458-6BC34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4458-6BC34 soft starter, 1680 A at 40 °C, 690 V insulation voltage, integrated bypass contact system, inside-delta circuit capable, screw fixing.","salesMarkdown":"## Active production, current rating that drives the selection The 3RW4458-6BC34: Rated 1680 A at 40 °C, it handles heavy motor loads. Derate to 1472 A at 50 °C and 1316 A at 60 °C — the thermal ceiling is 60 °C during operation, so a panel with marginal airflow pushes the usable current down. The derating temperature threshold is 40 °C, meaning full rating only holds below that ambient. ## Bypass, inside-delta, and wiring constraints Integrated bypass contact system means the thyristors are shorted out once the motor is up to speed — no external bypass contactor needed, and the heat load on the panel drops after start. Inside-delta circuit connection is supported — this reduces the current through each thyristor leg to 58% of the line current, effectively extending the rating range for a given soft starter frame. Confirm the motor winding configuration before wiring. Main current circuit connection is busbar; the main conductor range accepts stranded 70–240 mm² and finely stranded 50–240 mm², or 2/0–500 kcmil. ## Mounting, clearance, and environmental fit Degree of pollution 3 per IEC 60947-4-2 — this is the industrial environment rating (conductive pollution or dry non-conductive pollution that becomes conductive due to condensation). No additional conformal coating required for typical factory-floor panels, but outdoor or washdown cabinets need a higher enclosure rating. Storage temperature range is -25 to +80 °C — the unit can sit in an unheated warehouse through most climates without damage. ## Protection, diagnostics, and commissioning notes Motor overload protection and intrinsic device protection (thyristor overtemperature, phase imbalance, etc.) are built in — no separate overload relay needed for most applications. Adjustable current limitation lets you set the start current between 8% and the rated value, which helps on weak supply networks or mechanically sensitive loads. Fault signal display is on the unit itself — a local readout shows the fault code without needing a connected HMI or PLC. External reset input allows remote clearing of latched faults from the control room. Maximum motor cable length is 500 m — beyond that, capacitive charging current from the cable can interfere with the thyristor gating. For long cable runs, consider an output reactor. A motor brake output is included as a component — useful for applications that need a DC injection brake after the soft starter ramps down.","metaTitle":"Siemens 3RW4458-6BC34 Soft Starter, 1680 A, SIRIUS","metaDescription":"Siemens 3RW4458-6BC34 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 (0.5 ... 2.5 mm²)","Width":"510mm","title":"3RW4458-6BC34","Height":"640mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 460 V, 50 °C standard: 850 A, 750 hp Inside-delta: 1472 A, 1300 hp 200-460 V AC, 115 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5556-6HA14<<","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 (20 ... 14)","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":"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":"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%","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":"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/a14d24391cac9522f1bdfe73bcc78f0b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=203902&mlfb=3RW4458-6BC34"},"ai":{"faq":[{"question":"Where can I buy the 3RW4458-6BC34 and get a price?","answer":"Sourced to order through independent industrial distribution. Submit a request with your target volume and delivery window for a quote."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4458-6BC34","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/3RW4458-6BC34 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}}