{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4456-2BC45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4456-2BC45","canonicalUrl":"https://aoctrl.com/siemens/3RW4456-2BC45","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4456-2BC45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4456-2BC45 soft starter, 1351 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass, inside-delta circuit, screw fixing, 510 x 640 x 290 mm.","salesMarkdown":"## Sizing the 3RW4456-2BC45 for the motor load An integrated bypass contact system switches the thyristors out of the circuit once the motor is at speed, eliminating conduction losses and reducing heat load on the enclosure — the bypass also extends thyristor life by keeping them cool during run. The inside-delta wiring option lets the starter connect inside the motor delta winding, reducing the current per thyristor to 58 % of the line current — this is the standard configuration for large motors and halves the thermal stress on the power stack. ## Mounting and wiring — panel integration constraints Mounting position allows vertical surface with ±90° rotation and ±22.5° tilt forward/backward — the starter can be oriented to fit tight panel layouts, but the derating curve assumes vertical orientation; horizontal mounting may require additional airflow. Fastening is by screw fixing to the mounting surface — the 510 mm width, 640 mm height, and 290 mm depth require a backplate large enough to clear the enclosure door and allow cable bending radius below the starter. ## Protection and control features for the commissioning engineer Motor overload protection and intrinsic device protection are built in — the starter monitors motor current and internal thyristor temperature, tripping on overload or overtemperature without an external relay. Adjustable current limitation lets the commissioning engineer set the starting current between 8 % and 100 % of the rated motor current — the minimum load threshold is 8 %, so the starter can handle lightly loaded motors without nuisance tripping. A display for fault signals and external reset input allow remote fault acknowledgement and local diagnostics — the motor brake output controls a DC injection brake directly from the starter, eliminating a separate brake controller. Pollution degree 3 per IEC 60947-4-2 means the starter is rated for conductive pollution in industrial atmospheres — no additional conformal coating required for most panel environments.","metaTitle":"Siemens 3RW4456-2BC45 SIRIUS Soft Starter, 1351 A at 40 °C","metaDescription":"Siemens 3RW4456-2BC45 SIRIUS soft starter, rated 1351 A at 40 °C, 690 V insulation, integrated bypass, inside-delta capable. Active production, quoted to order.","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":"3RW4456-2BC45","Height":"640mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 500 V, 40 °C standard: 780 A, 560 kW Inside-delta: 1351 A, 900 kW 400-600 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5554-2HA16<<","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":"230V","at 60 Hz rated value":"230V","at 40 °C rated value":"1 351A","at 50 °C rated value":"1 200A","at 60 °C rated value":"1 065A","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":"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":"900kW","at inside-delta circuit at 50 °C rated value":"1 350hp","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":"214W","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":"156A","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":27,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/7830f9e88239803fb21f87f70e9d46b1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=137378&mlfb=3RW4456-2BC45"},"ai":{"faq":[{"question":"Where can I buy the 3RW4456-2BC45 and get a price?","answer":"Available through independent distribution — submit an RFQ with your target quantity and delivery window."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4456-2BC45","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/3RW4456-2BC45 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}}