{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4458-2BC35","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4458-2BC35","canonicalUrl":"https://aoctrl.com/siemens/3RW4458-2BC35","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4458-2BC35","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4458-2BC35 soft starter, 1680 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass, inside-delta circuit, screw fixing, 640 x 510 x 290 mm.","salesMarkdown":"## 1680 A at 40 °C — what that means for a motor line The 3RW4458-2BC35 is a SIRIUS soft starter rated 1680 A at 40 °C in standard duty. That current rating drops to 1472 A at 50 °C and 1316 A at 60 °C, so the panel ambient temperature directly governs the motor current it can handle — if the enclosure runs hot, you lose headroom. The insulation voltage ceiling is 690 V, and it runs on 50 or 60 Hz supply. The integrated bypass contact system means the thyristors are shorted out once the motor is up to speed, cutting heat dissipation in the cabinet. ## Inside-delta wiring and protection features This unit supports inside-delta circuit wiring, which lets you use a smaller-rated soft starter for a given motor by connecting the thyristors in the delta legs rather than the line. The minimum load threshold is 8 % of the rated current — below that the starter may not detect the load correctly. Motor overload protection and intrinsic device protection are built in, with adjustable current limitation. An external reset input and a display for fault signals make commissioning and troubleshooting straightforward. The control and auxiliary wiring uses spring-loaded terminals; the main current circuit is busbar connection. Stranded cable from 70 to 240 mm² and finely stranded from 50 to 240 mm² are accepted on the power side, with a kcmil range of 2/0 to 500 for North American builds. ## Mounting and panel fit Clearance requirements: 100 mm upwards, 75 mm downwards, 5 mm at the sides. The pollution degree is 3 per IEC 60947-4-2, meaning it's rated for conductive pollution environments typical in industrial panels. Maximum motor cable length is 500 m — beyond that, reflected wave voltage spikes may stress the motor insulation. The operating temperature range is up to 60 °C during operation, with storage from -25 to +80 °C.","metaTitle":"Siemens 3RW4458-2BC35 SIRIUS Soft Starter, 1680 A at 40 °C","metaDescription":"Siemens 3RW4458-2BC35 SIRIUS soft starter, rated 1680 A at 40 °C, 690 V insulation voltage. Active production, integrated bypass, inside-delta capable.","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":"3RW4458-2BC35","Height":"640mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 575 V, 50 °C standard: 850 A, 950 hp Inside-delta: 1472 A, 1650 hp 400-600 V AC, 115 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":"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":"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 ... 600V","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/499f667756e60b165545270ceb74107d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=308739&mlfb=3RW4458-2BC35"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4458-2BC35","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/3RW4458-2BC35 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}}