{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4458-6BC44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4458-6BC44","canonicalUrl":"https://aoctrl.com/siemens/3RW4458-6BC44","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4458-6BC44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4458-6BC44 soft starter, 1680 A at 40 °C, 690 V insulation voltage, integrated bypass, inside-delta circuit, active production.","salesMarkdown":"## 1680 A soft starter with integrated bypass for heavy motor starts The Siemens SIRIUS 3RW4458-6BC44 is a soft starter rated 1 680 A at 40 °C, with an insulation voltage of 690 V and an operating frequency of 50... 60 Hz. That current rating governs motor starts up to that full-load amp level in a standard 40 °C enclosure — derate to 1 472 A at 50 °C and 1 316 A at 60 °C if your panel runs hot. The integrated bypass contact system takes the thyristors out of circuit after start, so you don't pay continuous conduction losses across the silicon. This is a SIRIUS-series unit designed for screw-fixing to a vertical mounting surface, rotatable ±90° and tiltable ±22.5° front-to-back. The 510 mm width × 640 mm height × 290 mm depth footprint means it fills a full panel section — plan the gland plate and busbar clearance accordingly. ## Protection and control features for demanding motor loads Motor overload protection and intrinsic device protection are built in — no separate overload relay needed upstream for the soft starter itself. The adjustable current limitation lets you set the start current between 8% and 100% of the motor FLA, which is useful for soft-starting conveyors or pumps that need a controlled ramp without mechanical shock. Minimum load is 8%, so it won't drop out on lightly loaded motors. An external reset input and a display for fault signals make commissioning and troubleshooting straightforward. The inside-delta circuit wiring configuration reduces the current through the thyristors by a factor of √3 compared to standard in-line connection — useful for squeezing higher motor ratings from the same device frame. A product component motor brake output is included, so this unit can directly control a DC brake on the motor shaft without an external contactor. The maximum wire length to the motor is 500 m, which covers most plant-floor runs. ## Termination and wiring — busbar primary, screw terminals for auxiliaries The main current circuit connects via busbar connection — expect to run copper bars rather than cable tails for the 1680 A feed. Solid conductors accepted are 2x (0.5... 2.5 mm²) for the auxiliary and control circuit, which uses screw-type terminals. Stranded main conductors range from 70... 240 mm², finely stranded from 50... 240 mm², and AWG/kcmil equivalents are 2/0... 500 kcmil. Clearance requirements: 100 mm upwards, 75 mm downwards, 5 mm at the side. Storage temperature range is -25... +80 °C; during operation the ambient limit is 60 °C.","metaTitle":"Siemens 3RW4458-6BC44 SIRIUS Soft Starter, 1680 A, 690 V","metaDescription":"Siemens 3RW4458-6BC44 SIRIUS soft starter, rated 1680 A at 40 °C, 690 V insulation voltage. Active production.","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":"3RW4458-6BC44","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 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":"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":"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/b7eecd1938df1c59c68f69f1f1cdb808.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=178216&mlfb=3RW4458-6BC44"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4458-6BC44","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/3RW4458-6BC44 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}}