{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4455-2BC34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4455-2BC34","canonicalUrl":"https://aoctrl.com/siemens/3RW4455-2BC34","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4455-2BC34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4455-2BC34 soft starter, 1200 A at 40 °C, 690 V insulation, integrated bypass, screw fixing, spring-loaded auxiliary terminals.","salesMarkdown":"## 1200 A at 40 °C — the rating that sizes the motor circuit The 3RW4455-2BC34: That 40 °C baseline is the standard industrial panel ambient — if your enclosure runs hotter, the available current drops by about 11 % per 10 °C rise. Insulation voltage is 690 V, giving headroom on 400/480 V systems. The unit operates on 50/60 Hz lines, so it's a single SKU for global installs. Pollution degree 3 per IEC 60947-4-2 means it's rated for the conductive dust and humidity you get in a typical industrial panel — no derating for dirty environments. ## Integrated bypass — less heat, smaller cabinet An integrated bypass contact system shorts the thyristors once the motor is up to speed. That means the soft starter's heat sink only dissipates power during the start ramp — during run, the bypass carries the current with near-zero loss. This keeps the cabinet cooler and lets you size the ventilation for starting duty, not continuous full-load heat. Inside-delta circuit wiring is supported, which reduces the current through each soft starter phase to 58 % of the line current. If you're starting a delta-wound motor, this can drop the required unit rating by nearly half — useful for squeezing a larger motor into an existing starter frame. ## Mounting and wiring — what fits in the panel Dimensions are 640 mm high × 510 mm wide × 290 mm deep. Screw fixing — no DIN-rail clip; plan for four mounting points on the backplate. Clearance: 100 mm above, 75 mm below, 5 mm at the sides. That 100 mm top gap is for cable bending radius and airflow; don't pinch it. Main current circuit uses busbar connection — expect flat copper bars, not cable lugs. The auxiliary terminals are spring-loaded — strip and push, no screwdriver needed. Maximum motor cable length is 500 m — long enough for most plant layouts, but if you're pushing a remote motor past that, you'll need an output reactor. ## Protection and control features Motor overload protection and intrinsic device protection are both built in. Adjustable current limitation lets you set the start current between 8 % and 100 % of the rated value — the minimum load threshold is 8 %, so it handles lightly loaded conveyors and pumps without nuisance tripping. External reset input and a display for fault signals are standard. The unit also includes a motor brake output component — if your application has a mechanical brake, this saves an external relay. Storage temperature range is -25 to +80 °C; operating ambient max is 60 °C. The derating temperature threshold is 40 °C — above that, follow the derating curve in the manual. ## Lifecycle and sourcing — active, quoted to order Lifecycle stage is marked 'current' — this is an active-production part from Siemens. The 3RW4455-2BC34 is a standard catalog item in the SIRIUS family. Confirm your BOM line against the 1200 A rating and 690 V insulation before ordering.","metaTitle":"Siemens 3RW4455-2BC34 SIRIUS Soft Starter, 1200 A, 690 V","metaDescription":"Siemens 3RW4455-2BC34 SIRIUS soft starter, 1200 A at 40 °C, 690 V insulation, integrated bypass, active production. Quoted to order against 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":"3RW4455-2BC34","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: 615 A, 500 hp Inside-delta: 1065 A, 950 hp 200-460 V AC, 115 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5553-2HA14<<","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 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":"400kW","at standard circuit at 50 °C rated value":"500hp","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":"710kW","at inside-delta circuit at 50 °C rated value":"950hp","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":"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/fce983176f7d8ff3e5dbb65b36ec7c0a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=390304&mlfb=3RW4455-2BC34"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4455-2BC34","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/3RW4455-2BC34 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}}