{"product_id":"3rw4456-6bc44-sirius-soft-starter-780a-400v-ac-siemens","title":"3RW4456-6BC44 | SIRIUS Soft Starter 780A 400V AC Siemens","description":"\u003ch2\u003e\u003cstrong\u003eSIRIUS 3RW4456-6BC44 Soft Starter – 780A \/ 1351A Inside-Delta\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Technical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand \u0026amp; Model:\u003c\/strong\u003e Siemens SIRIUS \u003cstrong\u003e3RW4456-6BC44\u003c\/strong\u003e – high-feature soft starter for three-phase motors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated Operating Current:\u003c\/strong\u003e 780 A at 40 °C (standard); 1351 A at 40 °C (inside-delta).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Power Output:\u003c\/strong\u003e 450 kW at 400 V (standard); 800 kW at 400 V (inside-delta).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Voltage Range:\u003c\/strong\u003e 200–460 V AC, with -15% \/ +10% tolerance for both standard and inside-delta circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl Supply Voltage:\u003c\/strong\u003e 230 V AC, 50\/60 Hz, with -15% \/ +10% tolerance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Motor Current:\u003c\/strong\u003e 156 A minimum for overload protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContinuous Overload Capacity:\u003c\/strong\u003e 115% of rated current at 40 °C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Loss:\u003c\/strong\u003e Typically 214 W during operation at rated current.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation Voltage:\u003c\/strong\u003e 690 V rated, pollution degree 3 per IEC 60947-4-2.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eEnvironmental \u0026amp; Mechanical Ratings\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmbient Temperature:\u003c\/strong\u003e Operates up to 60 °C; current derates to 693 A at 50 °C and 615 A at 60 °C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection Class:\u003c\/strong\u003e IP00 – suitable for cabinet installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (W x H x D):\u003c\/strong\u003e 510 mm x 640 mm x 290 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Screw fixing, vertical mounting ±90° rotatable, tiltable ±22.5° forward\/backward.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClearance Distances:\u003c\/strong\u003e 100 mm upward, 5 mm sideward, 75 mm downward.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax Cable Length:\u003c\/strong\u003e 500 m for main circuit connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Altitude:\u003c\/strong\u003e Up to 5000 m above sea level.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eElectrical Connections \u0026amp; Terminals\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain Circuit Connection:\u003c\/strong\u003e Busbar termination for DIN cable lugs (50–240 mm² fine-stranded, 70–240 mm² stranded).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuxiliary Circuit:\u003c\/strong\u003e Screw terminals, solid 2x (0.5–2.5 mm²), fine-stranded with ferrule 2x (0.5–1.5 mm²).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAWG Ratings:\u003c\/strong\u003e Main contacts 2\/0–500 kcmil; auxiliary contacts 2x (20–14).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuxiliary Contacts:\u003c\/strong\u003e 3 NO + 1 changeover; 0 NC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Functions:\u003c\/strong\u003e Motor overload protection, thermal resistor evaluation, external reset, adjustable current limitation, and inside-delta circuit support.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eProtection \u0026amp; Diagnostic Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in Device Protection:\u003c\/strong\u003e Yes – includes thyristor monitoring and intrinsic safeguards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Overload Protection:\u003c\/strong\u003e Adjustable to match motor FLA, with thermal memory.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFault Display:\u003c\/strong\u003e Visual indicator for quick diagnostics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBridging Contactor:\u003c\/strong\u003e Integrated to reduce heat dissipation after start.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside-Delta Ready:\u003c\/strong\u003e Optimized for high-power applications, reducing line current stress.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Brake Output:\u003c\/strong\u003e Included for dynamic braking control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation \u0026amp; Mounting Guidelines\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMount vertically with screw fixing; observe specified clearances for proper airflow.\u003c\/li\u003e\n\u003cli\u003eInstall at altitudes up to 5000 m – no performance derating below 1000 m.\u003c\/li\u003e\n\u003cli\u003eUse flexible copper busbars or stranded cables for main connections; torque terminals per Siemens specifications.\u003c\/li\u003e\n\u003cli\u003eEnsure control supply voltage is stable at 230 V AC, 50\/60 Hz, within tolerance limits.\u003c\/li\u003e\n\u003cli\u003eMaintain cable length within 500 m to avoid voltage drop and communication issues.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003ePackage Contents (Standard Accessories)\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3RW4456-6BC44\u003c\/strong\u003e soft starter unit with integrated thyristors and bypass contactor.\u003c\/li\u003e\n\u003cli\u003eMounting screws and hardware for panel installation.\u003c\/li\u003e\n\u003cli\u003ePrinted quick-start guide (multilingual).\u003c\/li\u003e\n\u003cli\u003eTerminal labels and auxiliary contact marking strips.\u003c\/li\u003e\n\u003cli\u003eNo additional modules or external bypass contactors required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eShipping \u0026amp; Logistics\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarriers:\u003c\/strong\u003e We ship via FedEx, UPS, or DHL – tracking provided.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDispatch Time:\u003c\/strong\u003e All orders leave our warehouse within 5 business days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Industrial-grade carton with anti-static and shock-absorbing materials.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions (FAQ)\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIs this unit brand new and original?\u003c\/strong\u003e Yes – we supply 100% new, original Siemens SIRIUS \u003cstrong\u003e3RW4456-6BC44\u003c\/strong\u003e soft starters from factory stock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDo you have this model in stock?\u003c\/strong\u003e Yes, we maintain regular inventory of the \u003cstrong\u003e3RW4456-6BC44\u003c\/strong\u003e for immediate dispatch while supplies last.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is the typical lead time?\u003c\/strong\u003e We ship within 5 working days after order confirmation via DHL, FedEx, or UPS.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCan I return the product if it doesn't fit my application?\u003c\/strong\u003e Yes – we accept returns within 30 days from delivery, provided the unit is unused and in original packaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is the minimum load requirement?\u003c\/strong\u003e The soft starter requires at least 8% of the rated motor current for proper operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoes it support inside-delta connection for 800 kW motors?\u003c\/strong\u003e Absolutely – the \u003cstrong\u003e3RW4456-6BC44\u003c\/strong\u003e delivers 1351 A at 40 °C in inside-delta mode, matching 800 kW at 400 V.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIs there a recommended replacement for this phased-out model?\u003c\/strong\u003e Yes – Siemens recommends the \u003cstrong\u003e3RW5554-6HA14\u003c\/strong\u003e as the preferred successor from the new SIRIUS 3RW5 series.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-top: 20px;\"\u003e\u003cstrong\u003eContact Information Inquiries:\u003c\/strong\u003e \u003ca href=\"mailto:sales@nex-auto.com\"\u003esales@nex-auto.com\u003c\/a\u003e , \u003ca href=\"https:\/\/wa.me\/8615392496288\" target=\"_blank\"\u003e+86 153 9242 9628\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"margin-top: 5px;\"\u003e\u003cstrong\u003ePartner NexAuto Technology Limited:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.nex-auto.com\/\" target=\"_blank\"\u003ehttps:\/\/www.nex-auto.com\/\u003c\/a\u003e\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46967811244193,"sku":"3RW4456-6BC44","price":259.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0673\/5390\/3265\/files\/3RW4456-6BC44.jpg?v=1788508627","url":"https:\/\/www.autonexcontrol.com\/products\/3rw4456-6bc44-sirius-soft-starter-780a-400v-ac-siemens","provider":"AutoNex Controls Limited ","version":"1.0","type":"link"}