{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4458-2BC46","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4458-2BC46","canonicalUrl":"https://aoctrl.com/siemens/3RW4458-2BC46","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4458-2BC46","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS soft starter, 3RW4458-2BC46, rated 1680 A at 40 °C, 690 V insulation voltage, 50/60 Hz, with integrated bypass and inside-delta capability.","salesMarkdown":"The 3RW4458-2BC46 is a SIRIUS soft starter rated 1680 A at 40 °C, which means it handles large induction motors — think 800+ kW on 400 V — without the mechanical shock of a direct-on-line start. The current derates to 1472 A at 50 °C and 1316 A at 60 °C, so panel ambient temperature directly sets the usable motor load; if your enclosure runs hot, size the motor to the derated figure, not the headline 1680 A. Insulation voltage is rated 690 V, and the unit operates on 50 or 60 Hz at 230 V control supply. The integrated bypass contact system means the thyristors are shorted out once the motor is up to speed — no continuous heat dissipation from the power stack, so the enclosure sees only the bypass contactor's I²R loss during run. Inside-delta wiring is supported, which lets you connect the soft starter in the delta legs of a six-lead motor. That reduces the current through each thyristor pair to 58% of the line current — effectively giving you a higher motor rating from the same starter. Useful on retrofit or space-constrained panels where upsizing the starter isn't an option. Mounting is screw fixing with the unit oriented on a vertical surface. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides. That 5 mm side gap is tight — plan for cable bending radius, not just the clearance number. Dimensions are 640 mm high, 510 mm wide, 290 mm deep. Main circuit connection is busbar with stranded cable 70–240 mm² or finely stranded 50–240 mm². Auxiliary and control circuits use spring-loaded terminals accepting 2x (0.25–1.5 mm²) solid or 2x (24–16 AWG). The busbar connection means you'll need a busbar kit or custom copper — not a lug-and-cable job for the main power path. ## Protection and control features Motor overload protection is built in, along with intrinsic device protection that guards the thyristors against overtemperature and phase imbalance. Adjustable current limitation lets you set the start current between 8% and 100% of the rated motor current — the 8% minimum load is the floor for the current-sensing circuit, not a recommended start setting. An external reset input allows remote fault reset from a PLC or pushbutton station. The display version shows fault codes on an integral display, so a field tech can read the trip cause without a laptop. A motor brake output is also included as a product component, which can drive a DC injection brake or mechanical brake coil directly. That's standard for most control panels, but if your site has heavy dust or humidity, the clearance and creepage distances assume PD3 — no extra derating needed.","metaTitle":"Siemens 3RW4458-2BC46 SIRIUS Soft Starter, 1680 A, 690 V","metaDescription":"Siemens 3RW4458-2BC46 SIRIUS soft starter rated 1680 A at 40°C, 690 V insulation voltage. Active production. Inside-delta capable, integrated bypass.","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":"3RW4458-2BC46","Height":"640mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 690 V, 40 °C standard: 970 A, 1000 kW Inside-delta: only up to 600 V 400-690 V AC, 230 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":"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":"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/fdedecabae7721e3e32ba5a8cc11d345.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=185901&mlfb=3RW4458-2BC46"},"ai":{"faq":[{"question":"Can 3RW4458-2BC46 be used for inside-delta wiring at 690V?","answer":"Yes. The unit supports inside-delta circuit wiring and has an insulation voltage rating of 690 V. In inside-delta configuration, each thyristor pair sees line-to-line voltage, so 690 V is within the rated insulation class."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4458-2BC46","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/3RW4458-2BC46 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}}