{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4458-6BC46","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4458-6BC46","canonicalUrl":"https://aoctrl.com/siemens/3RW4458-6BC46","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4458-6BC46","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4458-6BC46 soft starter, 1680 A at 40°C, 690 V insulation voltage, 50/60 Hz, integrated bypass, thyristor-based, screw fixing.","salesMarkdown":"## Current capacity across the ambient range The 3RW4458-6BC46: That 40 °C figure is the ceiling for full current — above it the continuous rating drops linearly, so a panel that runs warm (50 °C+) needs to account for the 12 % reduction from the 40 °C nameplate. Pollution degree 3 per IEC 60947-4-2 means it lives in an industrial enclosure where conductive dust or occasional condensation is expected. ## Integrated bypass and inside-delta wiring An integrated bypass contact system closes after the start ramp, shunting the thyristors. During run the current flows through the bypass — the power section generates no heat, which keeps the enclosure cooler and eliminates the need to derate for continuous thyristor conduction. The bypass also extends the life of the thyristors since they only carry current during the start interval. Inside-delta circuit wiring is supported — this reduces the current through each thyristor to 58 % of the motor full-load current, allowing the starter to handle a larger motor than the line-current rating suggests. For a given motor FLA, inside-delta connection effectively increases the starter's capacity by about 1.73×. ## Built-in protection and control features Motor overload protection is onboard — no separate overload relay needed. The electronic overload tracks motor current and trips on a class 10 or class 20 curve, adjustable to match the motor's thermal damage curve. Intrinsic device protection monitors the thyristor junction temperature and shuts down before the power section is damaged. Adjustable current limitation lets you set the maximum starting current as a multiple of the motor FLA, typically 2 to 5 times. This protects the supply transformer and downstream cables from high inrush. Minimum load is 8 % — the starter can soft-start lightly loaded motors (conveyors, pumps running dry) without oscillation or unstable ramping. An integrated motor brake output controls a DC injection brake or mechanical brake coil directly, saving an external contactor. The onboard display shows fault codes — no need to carry a laptop to read the trip cause. ## Mounting, wiring, and panel layout Dimensions are 640 mm high, 510 mm wide, 290 mm deep — a large frame that needs a substantial panel backplate. Fastening is screw fixing (not DIN-rail), so the panel must have threaded mounting points or a mounting plate. The mounting position allows ±90° rotation and ±22.5° tilt from vertical, giving some flexibility in cabinet layout. Clearance requirements: 100 mm above, 75 mm below, only 5 mm at the sides. The tight side clearance is a space saver — units can be mounted side-by-side with minimal gap. The main circuit connects via busbar (not cable lugs), so the panel busbar system must be designed to match the terminal layout. Cable connections use stranded 70…240 mm² or finely stranded 50…240 mm², or 2/0…500 kcmil for the main contacts. Maximum motor cable length is 500 m — long cable runs from the starter to the motor are allowed without additional output filters.","metaTitle":"Siemens 3RW4458-6BC46 SIRIUS Soft Starter, 1680 A at 40°C","metaDescription":"Siemens 3RW4458-6BC46 SIRIUS soft starter, 1680 A at 40°C, 690 V insulation, integrated bypass. Active production, quoted to order. Request 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":"3RW4458-6BC46","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 Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5556-6HA16<<","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 (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":"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%","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/17a4a122c47564bfde24145b9fce65b6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=115926&mlfb=3RW4458-6BC46"},"ai":{"faq":[{"question":"How do I get pricing and availability for 3RW4458-6BC46?","answer":"Submit an RFQ through this listing. The part is sourced through authorized distribution; a confirmed price and lead time will be returned against your BOM quantity."},{"question":"What is the continuous current rating at different ambient temperatures?","answer":"Above 40 °C the current must be derated per the published curve."},{"question":"Does 3RW4458-6BC46 support inside-delta wiring?","answer":"Yes, it supports inside-delta circuit connection, which reduces the current through each thyristor to 58 % of the motor FLA and effectively increases the starter's capacity."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4458-6BC46","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/3RW4458-6BC46 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}}