{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4456-2BC36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4456-2BC36","canonicalUrl":"https://aoctrl.com/siemens/3RW4456-2BC36","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4456-2BC36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4456-2BC36 soft starter, 1351 A at 40 °C, 690 V insulation, 50/60 Hz, integrated bypass, inside-delta capable, IP00.","salesMarkdown":"## Current rating that governs the real operating envelope The 3RW4456-2BC36: The headline 1351 A at 40 °C is the rating at the manufacturer's derating temperature threshold — above that, the available current drops to 1200 A at 50 °C and 1065 A at 60 °C. ## Integrated bypass — one less contactor in the BOM The 3RW4456-2BC36 carries an integrated bypass contact system, meaning the thyristors are shorted out once the motor reaches full speed. This eliminates the external bypass contactor that a standard soft starter topology requires — saves one panel-mounted device, reduces wiring, and cuts the heat load inside the enclosure because the bypass carries the full-load current with negligible losses. ## Inside-delta wiring cuts line current by 42 % This soft starter supports inside-delta circuit connection, which places the thyristors in the motor delta legs rather than the supply lines. The line current seen by the upstream breaker and cable is 58 % of the motor FLA — a 1351 A motor draws roughly 784 A from the supply in inside-delta mode. That difference can drop the feeder cable by two AWG sizes and may keep the installation within an existing MCC bucket rating without a bus upgrade. ## Pollution degree 3 — built for the panel floor, not the clean room Rated pollution degree 3 per IEC 60947-4-2, the creepage distances and clearance are designed for conductive dust, humidity, and the general industrial atmosphere you find on a motor control centre floor. This is not a clean-room device; it holds the unit on the grid in the same environment where the MCC sees grinding dust and coolant mist, provided the enclosure keeps the internal ambient within the derating curve. ## Protection set — three functions, one device Motor overload protection, intrinsic device protection for the thyristor junction temperature, and adjustable current limitation are all integrated. The current limitation sets a ceiling on the starting inrush — useful when starting into a weak supply or when the upstream protection is coordinated for a specific let-through. The motor overload replaces a separate thermal overload relay in the line, provided the application is within the soft starter's operating range. ## Control wiring — spring terminals, no torque driver needed The spring clamp holds the conductor without periodic re-torquing — one less maintenance item on the PM schedule. Main circuit connections are busbar with stranded cable range 70... 240 mm² and finely stranded 50... 240 mm², or 2/0... 500 kcmil for the North American install. ## Mounting position and cooling clearances Mounting position allows vertical surface orientation with ±90° rotation and ±22.5° tilt front-to-back. The cooling clearances are 100 mm upwards, 75 mm downwards, and 5 mm at the sides — the side clearance is tight, so the real thermal bottleneck is the vertical air path. Stacking units without the vertical clearance will force the upper unit to operate on the 50 °C or 60 °C derating curve even if the room ambient is 40 °C.","metaTitle":"Siemens 3RW4456-2BC36 SIRIUS Soft Starter, 1351 A, 690 V","metaDescription":"Siemens 3RW4456-2BC36 SIRIUS soft starter, 1351 A at 40 °C, 690 V insulation, integrated bypass. Active production, quoted to order. Request RFQ.","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":"3RW4456-2BC36","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: 693 A, 750 hp Inside-delta: 1200 A, 1350 hp 400-690 V AC, 115 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":"115V","at 60 Hz rated value":"115V","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 ... 690V","at 690 V at standard circuit at 40 °C rated value":"800kW","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":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/610923e1f8c765fa465b9541f0aec766.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=473733&mlfb=3RW4456-2BC36"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4456-2BC36","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/3RW4456-2BC36 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}}