{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4425-1BC45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4425-1BC45","canonicalUrl":"https://aoctrl.com/siemens/3RW4425-1BC45","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4425-1BC45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4425-1BC45 soft starter, 99 A at 40 °C, 690 V insulation, 50/60 Hz, integrated bypass, screw terminals, active production.","salesMarkdown":"## Sizing a soft starter for a motor load The 3RW4425-1BC45 is a SIRIUS soft starter rated 99 A at 40 °C, which means it handles a standard 55 kW (75 hp) motor at 400 V in normal starting duty — the current rating is the starting current ceiling, not the motor FLA, so size it for the motor's locked-rotor current, not the run current. It carries an integrated bypass contact system, so once the motor is up to speed the thyristors are shorted out — no external bypass contactor needed, and the bypass carries the full 99 A continuously without thyristor heat dissipation. The adjustable current limitation lets you set the starting current between 8 % and roughly 400 % of the soft starter's rated current, so you can tune the start to the load inertia — a high-inertia fan gets a longer ramp, a conveyor gets a quicker pull-up. ## Panel fit and wiring terminals Dimensions are 170 mm wide, 192 mm high, 270 mm deep — the 270 mm depth is the biggest fit constraint; check the enclosure depth before committing. Main circuit terminals are box terminals accepting 2x (4... 50 mm²) stranded or 2x (10... 1/0) AWG using both clamping points. Clearance around the unit: 100 mm upwards, 75 mm downwards, 5 mm at the sides — the side clearance is tight, so plan for airflow and cable bending radius. ## Thermal derating and operating limits The derating temperature threshold is 40 °C — above that, the current drops linearly. Maximum operating ambient is 60 °C; storage range is -25 to +80 °C. Pollution degree 3 per IEC 60947-4-2 means it tolerates conductive dust and humidity typical in industrial panels. Insulation voltage rated 690 V — suitable for 400 V and 480 V systems with margin. The inside-delta circuit option reduces the line current to 58 % of the motor winding current — useful when the supply transformer or cable is undersized for a standard-line start. Motor overload protection is integrated, along with intrinsic device protection — no separate overload relay needed in most installations.","metaTitle":"Siemens 3RW4425-1BC45 Soft Starter, 99 A, SIRIUS, Active","metaDescription":"Siemens 3RW4425-1BC45 SIRIUS soft starter, 99 A at 40°C, 690 V insulation. Active production. Integrated bypass. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"270mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"170mm","title":"3RW4425-1BC45","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 Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5525-1HA16<<","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 (20 ... 14)","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":"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":"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%","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":"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":"$3,705.86","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/7318e36a2da0be14364f9bdf9e4ac316.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=308748&mlfb=3RW4425-1BC45"},"ai":{"faq":[{"question":"How do I get pricing and availability for 3RW4425-1BC45?","answer":"No stock-holding claim is made here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4425-1BC45","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/3RW4425-1BC45 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}}