{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4458-6BC36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4458-6BC36","canonicalUrl":"https://aoctrl.com/siemens/3RW4458-6BC36","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4458-6BC36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4458-6BC36 soft starter, 1680 A at 40 °C, 690 V rated insulation voltage, 50/60 Hz, integrated bypass, inside-delta circuit, screw fixing.","salesMarkdown":"## 1680 A at 40 °C — sizing the main power path and the bypass The 3RW4458-6BC36: At 50 °C the rating drops to 1472 A, and at 60 °C it falls to 1316 A — the derating curve matters if the soft starter lives inside a closed panel near a furnace line or a hot-strip mill stand. The integrated bypass contact system eliminates the need for an external bypass contactor, saving panel space and reducing the wiring count — the thyristors are shorted out after the start, so the heat load in steady state is just the bypass contact resistance. Inside-delta circuit capability means the motor windings can be configured in delta and the soft starter connected in series with each winding, reducing the current through the soft starter to 58% of the line current — useful when the motor FLA exceeds the soft starter's rating. ## Termination and cable entry — what fits the lugs The main current circuit terminates via busbar connection; the power cable lugs accept stranded copper from 70 to 240 mm² and finely stranded from 50 to 240 mm². For US wire gauge equivalents, the main contacts accept 2/0 to 500 kcmil — covers the range from 2/0 AWG up to 500 MCM. ## Mounting and clearances — fitting it into the panel The unit measures 640 mm high by 510 mm wide by 290 mm deep and is fastened by screw fixing to a backplate — it does not snap onto a DIN rail. Mounting position allows a vertical surface with ±90° rotation and ±22.5° tilt forward or backward — useful when the panel layout forces an angled installation. Required clearances: 100 mm above, 75 mm below, and only 5 mm at the sides — the tight side clearance lets you pack units side-by-side, but the vertical clearance is non-negotiable for cable bending radius and airflow. ## Protection and diagnostics — what's built in Motor overload protection is integrated, so no separate overload relay is needed in the motor circuit — the thermal model protects the motor and the thyristors (intrinsic device protection,). Adjustable current limitation lets you set the starting torque from 8% of motor FLA (minimum load,) up to whatever the motor can handle — critical for soft-starting a loaded conveyor without tripping upstream. A display shows fault signals locally — no need to plug in a laptop to read the last trip cause. External reset input allows remote clearing of latched faults from a PLC or pushbutton station. ## Environmental and compliance — industrial-grade construction Pollution degree 3 per IEC 60947-4-2 — the soft starter is designed for conductive dust and industrial atmospheres, not just clean control rooms. Operating frequency is 50/60 Hz — the same unit works on either grid without a hardware change. Storage temperature range -25 to +80 °C; operating ambient up to 60 °C with derating starting at 40 °C.","metaTitle":"Siemens 3RW4458-6BC36 Soft Starter, 1680 A, 690 V, SIRIUS","metaDescription":"Siemens 3RW4458-6BC36 SIRIUS soft starter, 1680 A at 40 °C, 690 V insulation, with integrated bypass and inside-delta capability.","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":"3RW4458-6BC36","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 400-690 V AC, 115 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":"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 (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/e9e474ab8ac200f8df5bd915ec5daf47.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=151177&mlfb=3RW4458-6BC36"},"ai":{"faq":[{"question":"What is the maximum motor cable length for 3RW4458-6BC36?","answer":"The maximum wire length is 500 m — beyond that, voltage drop and reflected wave effects on the motor terminals must be evaluated."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4458-6BC36","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/3RW4458-6BC36 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}}