{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4454-2BC34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4454-2BC34","canonicalUrl":"https://aoctrl.com/siemens/3RW4454-2BC34","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4454-2BC34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4454-2BC34 soft starter, 1065 A at 40°C, 690 V insulation voltage, 50/60 Hz, integrated bypass contact system, inside-delta circuit, screw fixing.","salesMarkdown":"## Rated current derating — the real thermal envelope for panel loading The 3RW4454-2BC34: At 40 °C ambient the soft starter delivers 1,065 A continuous. That figure drops to 954 A at 50 °C and 847 A at 60 °C — a 20 % reduction from the 40 °C rating to the 60 °C ceiling. Panel builders should size the enclosure ventilation and busbar cross-section for the derated current at the expected internal ambient, not the headline 1,065 A number. The insulation voltage is rated 690 V, and the operating frequency covers 50 to 60 Hz, so the unit works on global line voltages without a hardware change. ## Integrated bypass and inside-delta — two features that shrink the panel An integrated bypass contact system eliminates the external bypass contactor normally required across the soft starter's thyristors. That saves one power contactor, the associated control wiring, and the heat dissipation from the bypass contactor coil. The thyristors themselves handle only the start/stop ramp; during run the bypass carries the full motor current with near-zero semiconductor losses. Inside-delta circuit capability reduces the current drawn from the line during start by approximately 42 % compared to an in-line connection, because each thyristor conducts only the phase-to-phase motor current rather than the full line current. This lets the soft starter handle a larger motor than its in-line rating would suggest — useful when the supply transformer or upstream breaker is the limiting factor. ## Mounting, clearances, and termination — what fits in the enclosure The unit measures 510 mm wide × 640 mm high × 290 mm deep and mounts with screw fixing. Clearance requirements: 100 mm above, 75 mm below, and only 5 mm at the sides. The tight side clearance means adjacent devices can be packed closely; the vertical gaps are for airflow through the heatsink and for cable bending radius. Main power connections use busbar termination — not cable lugs — so the panel design must include busbar runs rated for the full current. Stranded cable from 70 to 240 mm² and finely stranded from 50 to 240 mm² are accepted. The auxiliary and control circuit uses spring-loaded terminals accepting solid wire 2×(0.25-1.5 mm²) or AWG 24-16. ## Motor protection and diagnostics — what's built in Motor overload protection is integrated, so no separate overload relay is needed in the power circuit. The adjustable current limitation sets the starting torque profile to match the load — pump, conveyor, fan, or compressor. Minimum load is 8 %, which covers lightly loaded starts on unloaded conveyors or low-head pumps. A display shows fault signals for on-device diagnostics without an external HMI. External reset allows the fault to be cleared remotely from a PLC or pushbutton panel. The motor brake output controls a DC injection brake for applications that need a rapid stop — hoists, centrifuges, or indexing conveyors. The degree of pollution is rated 3 per IEC 60947-4-2, meaning the device is designed for industrial environments where conductive dust or occasional moisture condensation occurs. Operating temperature range is 60 °C max during operation, with storage from -25 to +80 °C. Maximum motor cable length is 500 m — beyond that, reflected wave voltage spikes may require an output reactor.","metaTitle":"Siemens 3RW4454-2BC34 SIRIUS Soft Starter, 1065 A at 40°C","metaDescription":"Siemens 3RW4454-2BC34 SIRIUS soft starter, 1065 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":"3RW4454-2BC34","Height":"640mm","Upwards":"100mm","Stranded":"70 ... 240 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 460 V, 50 °C standard: 551 A, 450 hp Inside-delta: 954 A, 850 hp 200-460 V AC, 115 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5552-2HA14<<","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":"115V","at 60 Hz rated value":"115V","at 40 °C rated value":"1 065A","at 50 °C rated value":"954A","at 60 °C rated value":"847A","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":"355kW","at standard circuit at 50 °C rated value":"450hp","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":"630kW","at inside-delta circuit at 50 °C rated value":"850hp","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":"186W","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":"123A","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/d572b9cd8b1e07e8e7aca2c417d8aeff.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=171103&mlfb=3RW4454-2BC34"},"ai":{"faq":[{"question":"What is the 3RW4454-2BC34 rated current at different temperatures?","answer":"At 40 °C ambient it delivers 1,065 A continuous. This derates to 954 A at 50 °C and 847 A at 60 °C. Panel builders should size enclosure ventilation and busbars for the derated current at the expected internal ambient."},{"question":"Does the 3RW4454-2BC34 include a bypass contactor?","answer":"Yes, an integrated bypass contact system is built in — no external bypass contactor is needed. During run mode the bypass carries the full motor current, eliminating semiconductor conduction losses."},{"question":"What are the clearance requirements for mounting the 3RW4454-2BC34?","answer":"Clearances needed: 100 mm above, 75 mm below, and only 5 mm at the sides. The tight side clearance allows close packing of adjacent devices; the vertical gaps provide airflow through the heatsink and cable bending radius."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4454-2BC34","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/3RW4454-2BC34 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}