{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4456-2BC44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4456-2BC44","canonicalUrl":"https://aoctrl.com/siemens/3RW4456-2BC44","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4456-2BC44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4456-2BC44 soft starter, 1351 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass, inside-delta capable, display for fault signal.","salesMarkdown":"## Rated current and thermal derating — the real-world continuous duty ceiling The 3RW4456-2BC44 is rated 1351 A at 40 °C, 1200 A at 50 °C, and 1065 A at 60 °C. That 21 % drop from 40 °C to 60 °C is the derating curve you need for the enclosure ambient — if the panel hits 50 °C, the continuous current ceiling is 1200 A, not the headline 1351 A. This is a SIRIUS soft starter with an integrated bypass contact system, meaning after the start ramp the thyristors are shorted and the motor runs through the bypass contacts — heat dissipation drops to near-zero during run, so the derating matters mainly for repeated start cycles or stalled-rotor conditions. ## Protection architecture — three functions in one device Motor overload protection, intrinsic device protection (thyristor overtemperature, phase imbalance, SCR short-circuit detection), and adjustable current limitation are all onboard. That eliminates the separate overload relay and reduces panel wiring — the soft starter manages the motor thermal model directly. The minimum load setting is 8 % of the rated current, so it can start lightly loaded conveyors or pumps without nuisance tripping on the current-limitation threshold. ## Inside-delta wiring and motor brake output — two architecture choices that affect panel layout Inside-delta circuit wiring is supported — this connects the soft starter in the delta legs of a six-lead motor, reducing the current through the thyristors by a factor of √3 compared to inline wiring. For a given motor power, the inside-delta configuration lets you use a smaller-frame soft starter. A motor brake output is integrated, so for applications with a mechanical holding brake (vertical conveyors, hoists), you skip the separate brake contactor and its control wiring. ## Termination split — main circuit busbar, control circuit spring-clamp The main current circuit terminates via busbar connection — stranded 70...240 mm² or finely stranded 50...240 mm², with AWG 2/0...500 kcmil also listed. That split means the power cables land on busbars (torque-controlled, typically M10 or M12 studs), while the control wiring pushes into spring-clamp terminals — no screwdriver needed for the control side, which speeds up commissioning. ## Mounting and environmental envelope The unit measures 640 mm high by 510 mm wide by 290 mm deep, fastened by screw fixing. Mounting position allows a vertical surface with ±90° rotation and ±22.5° tilt forward/backward — useful when the panel layout forces an off-axis orientation. Pollution degree 3 per IEC 60947-4-2 means it tolerates conductive dust and occasional condensation — standard for industrial enclosures without climate control. Storage temperature range is -25 to +80 °C; operation up to 60 °C ambient. Clearance requirements: 100 mm upwards, 75 mm downwards, 5 mm at the sides. The 500 m maximum wire length from the soft starter to the motor limits voltage drop on long cable runs — factor this into the motor circuit layout. Sourced through independent distribution channels. No stock-holding claim; quoted per RFQ.","metaTitle":"Siemens 3RW4456-2BC44 Soft Starter, 1351 A at 40 °C, SIRIUS","metaDescription":"Siemens 3RW4456-2BC44 SIRIUS soft starter, rated 1351 A at 40 °C, 690 V insulation voltage, 50/60 Hz. Active production, quoted to order. Request a quote.","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":"3RW4456-2BC44","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: 780 A, 450 kW Inside-delta: 1351 A, 800 kW 200-460 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5554-2HA14<<","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":"450kW","at standard circuit at 50 °C rated value":"600hp","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":"800kW","at inside-delta circuit at 50 °C rated value":"1 050hp","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%","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":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1f6af1b88758cbe5c0dfc2bb69d7a663.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=246160&mlfb=3RW4456-2BC44"},"ai":{"faq":[{"question":"How do I get pricing and availability for 3RW4456-2BC44?","answer":"Submit an RFQ against your BOM quantity."},{"question":"What is the 3RW4456-2BC44 rated current at different ambient temperatures?","answer":"Rated current is 1351 A at 40 °C, 1200 A at 50 °C, and 1065 A at 60 °C. The integrated bypass contacts carry the motor current during run, so the derating curve applies primarily to start-cycle duty."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4456-2BC44","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/3RW4456-2BC44 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}}