{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4453-6BC34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4453-6BC34","canonicalUrl":"https://aoctrl.com/siemens/3RW4453-6BC34","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4453-6BC34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4453-6BC34 soft starter, 954 A at 40 °C, 690 V insulation voltage, integrated bypass, inside-delta wiring support, 115 V AC control supply.","salesMarkdown":"## What the 954 A rating actually means for your motor line The Siemens 3RW4453-6BC34 is a SIRIUS soft starter rated 954 A at 40 °C — that's the continuous motor current it can handle in standard in-line wiring. The 690 V insulation voltage gives headroom on 400/480 V systems without derating the isolation gap. An integrated bypass contact system means the thyristors are shorted out after the motor reaches full speed — the 954 A rating applies to the bypass path, not just the silicon. That keeps the heatsink cool in continuous run and extends the life of the semiconductors. Inside-delta wiring is supported, which drops the current through each thyristor leg to about 58% of the line current — effectively letting this unit start motors up to roughly 1650 A line current in a delta-configured winding. Check the motor terminal box arrangement before specifying that topology. ## Panel fit and wiring — the physical constraints This is a screw-fixed unit, not a DIN-rail snap-on. The footprint is 640 mm high × 510 mm wide × 290 mm deep — measure the backplate and door clearance before ordering. Required airflow gaps: 100 mm above, 75 mm below, and only 5 mm at the sides for tight side-by-side mounting. Main current circuit connects via busbars. The stranded cable range is 70 to 240 mm², with finely stranded (flexible) cable from 50 to 240 mm², and AWG equivalents from 2/0 to 500 kcmil. That's heavy lug work — budget for a hydraulic crimper and busbar drilling. Auxiliary and control circuits use screw-type terminals accepting 2 × (0.5 to 2.5 mm²) solid or 2 × (AWG 20 to 14) for aux contacts. Maximum motor cable length is 500 m — fine for most plant layouts, but if you're feeding a remote pump house, check the cable capacitance against the thyristor dV/dt rating. ## Lifecycle and sourcing — still active, no replacement needed ## Protection and control features — what's built in Motor overload protection and intrinsic device protection are integrated — no separate overload relay needed, and the thyristor junction temperature is monitored directly. Adjustable current limitation lets you set the start current between 8% and 100% of the rated motor current, and the minimum load threshold is 8% — below that the unit won't regulate, but that's rarely an issue for induction motors. An external reset input allows remote fault clearing from a PLC or pushbutton station. The display version shows fault codes on the unit itself — no need to plug in a laptop for basic diagnostics. A motor brake output is included, which controls a DC injection brake for vertical or high-inertia loads — wire it to the brake coil directly. Control supply is 115 V AC at both 50 Hz and 60 Hz, with operating frequency rated 50 to 60 Hz. Storage temperature range is -25 to +80 °C; operating ambient max is 60 °C with derating applied above 40 °C.","metaTitle":"Siemens 3RW4453-6BC34 SIRIUS Soft Starter, 954A, 690V","metaDescription":"Siemens 3RW4453-6BC34 SIRIUS soft starter, 954 A at 40 °C, 690 V insulation, with integrated bypass and inside-delta capability. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"290mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"510mm","title":"3RW4453-6BC34","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: 494 A, 400 hp Inside-delta: 856 A, 750 hp 200-460 V AC, 115 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5548-6HA14<<","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":"954A","at 50 °C rated value":"856A","at 60 °C rated value":"759A","For Auxiliary Contacts":"2x (20 ... 14)","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":"screw-type 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 (0.5 ... 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":"315kW","at standard circuit at 50 °C rated value":"400hp","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":"560kW","at inside-delta circuit at 50 °C rated value":"750hp","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%","For Auxiliary Contacts Finely Stranded With Core End Processing":"2x (20 ... 16)","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":"159W","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":"110A","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/c552c4062772438feab31f127b98a5fe.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=239933&mlfb=3RW4453-6BC34"},"ai":{"faq":[{"question":"Where can I buy 3RW4453-6BC34?","answer":"This part is sourced through independent distribution channels. Submit an RFQ for current availability and pricing — both are confirmed at quote time."},{"question":"Can 3RW4453-6BC34 be used for inside-delta configuration?","answer":"Yes — inside-delta wiring is supported. In that topology the current through each thyristor leg drops to roughly 58% of line current, allowing the unit to start motors with a higher line current than its in-line rating."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4453-6BC34","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/3RW4453-6BC34 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}}