{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4455-2BC45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4455-2BC45","canonicalUrl":"https://aoctrl.com/siemens/3RW4455-2BC45","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4455-2BC45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4455-2BC45 soft starter, 1200 A at 40 °C, 690 V insulation voltage, thyristor-based, integrated bypass contact system, screw fixing.","salesMarkdown":"## Sizing the 3RW4455-2BC45 for motor starting duty Insulation voltage is 690 V, certified to IEC 60947-4-2 with pollution degree 3 — the standard for industrial motor starting where conductive dust and condensation are present. The operating frequency covers 50... 60 Hz, so it lands on either line frequency without a configuration change. Thyristor-based switching with an integrated bypass contact system means the silicon handles the ramp-up, then the bypass contactor carries the full-load current continuously — the thyristors are only stressed during start/stop, not at steady state. Adjustable current limitation and motor overload protection are built in, so no separate overload relay is needed for the motor branch. ## Panel integration and clearance constraints Clearance requirements: 100 mm upwards, 75 mm downwards, and only 5 mm at the side — the side clearance is tight enough that adjacent components can sit nearly flush, but the vertical air path needs room for convection cooling. The derating curve assumes free air flow; stacking units without the vertical gap will push the operating temperature above the 60 °C ceiling. Main circuit wiring accepts stranded 70... 240 mm² or finely stranded 50... 240 mm², plus 2/0... 500 kcmil for North American builds. ## Lifecycle and compliance documentation The product carries pollution degree 3 per IEC 60947-4-2, which is the relevant product standard for soft starters. The insulation voltage rating of 690 V and the 50/60 Hz operating frequency are declared on the nameplate. For RoHS/REACH declarations, the manufacturer provides a declaration of conformity referenced to the SIRIUS series; request the current declaration at RFQ.","metaTitle":"Siemens 3RW4455-2BC45 SIRIUS Soft Starter, 1200 A, 690 V","metaDescription":"Siemens SIRIUS 3RW4455-2BC45 soft starter, 1200 A at 40 °C, 690 V insulation, integrated bypass, thyristor control. 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":"3RW4455-2BC45","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: 693 A, 500 kW Inside-delta: 1200 A, 800 kW 400-600 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5553-2HA16<<","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 200A","at 50 °C rated value":"1 065A","at 60 °C rated value":"954A","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":"500kW","at standard circuit at 50 °C rated value":"700hp","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 200hp","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":"220W","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":"138A","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/9b57ac51502c01c84201ab88baff598d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=456394&mlfb=3RW4455-2BC45"},"ai":{"faq":[{"question":"What is the 3RW4455-2BC45's depth for panel layout?","answer":"The depth is 290 mm. Combined with the 640 mm height and 510 mm width, this requires a backplate that can accommodate the screw-fixing footprint and the busbar connection for the main circuit."},{"question":"What compliance documentation is available for the 3RW4455-2BC45?","answer":"The soft starter is certified to IEC 60947-4-2 with pollution degree 3. The manufacturer provides a declaration of conformity for the SIRIUS series covering the relevant standards. Request the current RoHS/REACH declaration at the time of RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4455-2BC45","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/3RW4455-2BC45 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}}