{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4425-3BC45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4425-3BC45","canonicalUrl":"https://aoctrl.com/siemens/3RW4425-3BC45","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4425-3BC45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4425-3BC45 soft starter, 99 A at 40 °C, 230 V AC, 50/60 Hz, integrated bypass, adjustable current limit, inside-delta circuit, screw fixing, box terminal main circuit, spring-loaded auxiliary/control terminals.","salesMarkdown":"## 99 A at 40 °C — derating drives the real rating The 3RW4425-3BC45: For a 230 V motor line, this means the continuous current capacity drops by roughly 10 A per 10 °C rise above 40 °C — the derating curve is the number that decides whether this unit holds a given motor FLA in a warm cabinet. ## Integrated bypass and inside-delta wiring An integrated bypass contact system carries the motor current after start-up, removing the thyristors from the power path and eliminating their heat dissipation during run. This keeps the enclosure cooler and lets the soft starter handle longer acceleration times without derating further. Inside-delta circuit wiring is supported — a six-wire motor connection that places the soft starter in the delta legs, reducing the per-phase current the unit must carry by roughly 42 % compared to standard in-line wiring. For a given motor, this can allow a smaller-frame soft starter to do the job. ## Termination and mounting Main power connections use box terminals accepting 2x (4... 50 mm²) stranded or 2x (10... 1/0 AWG) using both clamping points. Screw fixing to the mounting surface. The unit can be mounted with a vertical surface, rotatable ±90°, and tiltable ±22.5° front-to-back — useful when fitting into existing panel layouts where the backplane is not perfectly plumb. ## Protection and control features Motor overload protection and intrinsic device protection are built in — the soft starter monitors both the motor and its own thyristor temperature, reducing nuisance trips from overloads that are actually harmless for the motor but would stress the semiconductors. Adjustable current limitation lets the user set the maximum starting current between 100 % and the unit's rated current (typically 300–400 % of motor FLA in practice), which is the primary tool for limiting line drop during start. Minimum load is 8 % of the rated current — below that the motor may not be reliably detected. External reset input and a display for fault signals are standard — the display shows the last fault code, which cuts troubleshooting time on a line-down call. ## Clearance and cable length Required clearance around the unit: 100 mm above, 75 mm below, 5 mm at the sides. These are the minimum air gaps for natural convection cooling — crowding the top clearance will raise the internal temperature and accelerate derating. Maximum motor cable length is 500 m — beyond that, capacitive charging current from the cable can interfere with the soft starter's current sensing and cause nuisance overcurrent trips. ## Environmental and insulation ratings Rated insulation voltage 690 V, pollution degree 3 per IEC 60947-4-2 — suitable for industrial environments where conductive dust or condensation is present.","metaTitle":"Siemens 3RW4425-3BC45 SIRIUS Soft Starter, 99 A at 40 °C","metaDescription":"Siemens 3RW4425-3BC45 SIRIUS soft starter, 99 A at 40 °C, 230 V, 50/60 Hz. Integrated bypass, adjustable current limit, inside-delta capable.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"270mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"170mm","title":"3RW4425-3BC45","Height":"192mm","Upwards":"100mm","Stranded":"2x (4 ... 50 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 500 V, 40 °C standard: 57 A, 37 kW Inside-delta: 99 A, 55 kW 400-600 V AC, 230 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5525-3HA16<<","During Storage":"-25 ... +80°C","External Reset":"Yes","lifecycle_stage":"current","During Operation":"60°C","Fastening Method":"screw fixing","Minimum Load [%]":"8%","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":"99A","at 50 °C rated value":"88A","at 60 °C rated value":"78A","For Auxiliary Contacts":"2x (24 ... 16)","For Main Current Circuit":"box terminal","Motor Overload Protection":"Yes","Using Both Clamping Points":"2x (10 ... 1/0)","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Using The Back Clamping Point":"10 ... 2/0","Insulation Voltage Rated Value":"690V","Using The Front Clamping Point":"10 ... 2/0","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":"37kW","at standard circuit at 50 °C rated value":"40hp","Finely Stranded Without Core End Processing":"2x (4 ... 35 mm²)","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":"55kW","at inside-delta circuit at 50 °C rated value":"75hp","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":"36W","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":"11A","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/303f3d66325f3251a9e1aff8da521b2d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=240312&mlfb=3RW4425-3BC45"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for 3RW4425-3BC45?","answer":"The unit carries a pollution degree 3 rating per IEC 60947-4-2, which implies compliance with the relevant IEC/EN standards for soft starters. Specific RoHS, REACH, or UL documentation should be confirmed at RFQ — the evidence does not list individual cert marks."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4425-3BC45","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/3RW4425-3BC45 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}}