{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4458-2BC34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4458-2BC34","canonicalUrl":"https://aoctrl.com/siemens/3RW4458-2BC34","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4458-2BC34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4458-2BC34 soft starter, 1680 A rated current at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass, inside-delta circuit capable, screw fixing.","salesMarkdown":"The Siemens 3RW4458-2BC34 is a SIRIUS soft starter rated 1680 A at 40 °C, with derated values of 1472 A at 50 °C and 1316 A at 60 °C. That 1680 A figure is the full-load current it can handle in standard duty — sized for large motor loads like pumps, conveyors, or compressors on a 400 V or 690 V line. The 690 V insulation voltage means it's rated for 690 V phase-to-phase systems, common in heavy industrial plants. Operating frequency covers 50 to 60 Hz, so it fits either grid standard without adjustment. The integrated bypass contact system switches the thyristors out of the circuit once the motor is up to speed, eliminating heat dissipation from the semiconductors during run — a key feature for continuous-duty applications where wasted heat would drive up enclosure cooling costs. Adjustable current limitation lets you set the starting current between 8% and 100% of the rated value, giving you control over inrush on weak supply lines or mechanically sensitive loads. The inside-delta circuit capability means this soft starter can be wired in the motor's delta loop rather than in the supply lines, which reduces the current the starter sees by a factor of √3 — useful for squeezing a higher motor rating out of a given starter frame. A display for fault signals and an external reset input simplify troubleshooting and remote restart on a line. The motor brake output is a component-level feature for applications that need a DC injection brake. Dimensions are 510 mm wide, 640 mm high, 290 mm deep. Clearance requirements: 100 mm above, 75 mm below, and only 5 mm at the sides — the side clearance is tight, so plan for airflow and cable bending radius accordingly. Main current circuit connection is via busbar, accepting stranded wire 70–240 mm² or finely stranded 50–240 mm², and AWG 2/0–500 kcmil. Auxiliary and control circuits use spring-loaded terminals accepting solid 0.25–1.5 mm² or AWG 24–16. Maximum wire length from starter to motor is 500 m — beyond that, voltage drop and cable capacitance may affect performance.","metaTitle":"Siemens 3RW4458-2BC34 SIRIUS Soft Starter, 1680 A, 690 V","metaDescription":"Siemens 3RW4458-2BC34 SIRIUS soft starter rated 1680 A at 40 °C, 690 V insulation voltage, 50/60 Hz.","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":"3RW4458-2BC34","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 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":"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":"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/858c0da3feb137dd72f881e9a12db050.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=273736&mlfb=3RW4458-2BC34"},"ai":{"faq":[{"question":"What are the specifications of the 3RW4458-2BC34 soft starter?","answer":"Key specs: rated current 1680 A at 40 °C, insulation voltage 690 V, operating frequency 50/60 Hz, integrated bypass, inside-delta circuit capable, motor overload protection, adjustable current limitation, and a display for fault signals."},{"question":"Where can I buy the 3RW4458-2BC34?","answer":"This part is sourced to order through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4458-2BC34","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/3RW4458-2BC34 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}}