{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4425-1BC34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4425-1BC34","canonicalUrl":"https://aoctrl.com/siemens/3RW4425-1BC34","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4425-1BC34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4425-1BC34 soft starter, 99 A at 40 °C, 690 V insulation voltage, 50/60 Hz, integrated bypass, thyristor control, screw fixing.","salesMarkdown":"## Current rating and thermal derating The 3RW4425-1BC34: The derating temperature threshold is 40 °C — above that, the continuous current capacity drops linearly. For a panel build in a 50 °C environment, budget the 88 A figure as the usable ceiling, not the 99 A nameplate. The 8% minimum load setting means the soft starter can regulate starting torque down to very light loads without tripping — useful for unloaded conveyors or pump start-ups against a closed valve. ## Integrated bypass and protection An integrated bypass contact system means the thyristors are shorted out once the motor reaches full speed, eliminating SCR conduction losses during run. This keeps the enclosure cooler and lets the unit handle higher duty cycles than a soft starter without bypass. Motor overload protection and intrinsic device protection are both built in — no separate overload relay needed in the power circuit. The adjustable current limitation lets you cap inrush to a percentage of the motor FLA, which is the main parameter for coordinating with upstream MCCBs. ## Mounting and panel integration Screw fixing to a vertical mounting surface, with ±90° rotation and ±22.5° tilt allowance. The 270 mm depth is the dimension that matters for enclosure depth selection — the 170 mm width and 192 mm height are secondary. Clearance requirements: 100 mm upwards, 75 mm downwards, 5 mm at the sides. Box terminals on the main current circuit accept stranded wire from 4 to 50 mm² (2x conductors). The back and front clamping points accept 10 to 2/0 AWG.","metaTitle":"Siemens 3RW4425-1BC34 SIRIUS Soft Starter, 99 A at 40 °C","metaDescription":"Siemens 3RW4425-1BC34 SIRIUS soft starter, 99 A at 40 °C, 690 V insulation, integrated bypass, current limitation. Active production, quoted to order.","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":"3RW4425-1BC34","Height":"192mm","Upwards":"100mm","Stranded":"2x (4 ... 50 mm²)","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 460 V, 50 °C standard: 51 A, 30 hp Inside-delta: 88 A, 60 hp 200-460 V AC, 115 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5525-1HA14<<","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":"115V","at 60 Hz rated value":"115V","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":"30kW","at standard circuit at 50 °C rated value":"30hp","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":"60hp","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":"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":"$3,224.53","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a98993d75077894d36e4111dbca9071a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=136402&mlfb=3RW4425-1BC34"},"ai":{"faq":[{"question":"What is the maximum motor cable length for 3RW4425-1BC34?","answer":"The maximum wire length is 500 m. This is the total distance from the soft starter to the motor — longer runs increase voltage drop and may affect the thyristor commutation margin."},{"question":"Does 3RW4425-1BC34 support inside-delta (six-wire) motor connection?","answer":"Yes, the unit supports inside-delta circuit configuration. This allows the soft starter to be wired in the motor delta loop, reducing the current rating required through the thyristors by approximately 58% compared to in-line connection."},{"question":"What compliance documentation is available for 3RW4425-1BC34?","answer":"The unit is designed to IEC 60947-4-2 (pollution degree 3). Standard Siemens SIRIUS documentation includes CE, UKCA, and UL/CSA declarations — confirm specific certification markings required for your jurisdiction at RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4425-1BC34","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/3RW4425-1BC34 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}}