{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4425-3BC34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4425-3BC34","canonicalUrl":"https://aoctrl.com/siemens/3RW4425-3BC34","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4425-3BC34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4425-3BC34 soft starter, 99 A at 40 °C, 690 V insulation voltage, integrated bypass, adjustable current limitation, screw fixing, 170 x 192 x 270 mm (W x H x D).","salesMarkdown":"## Panel fit and mounting constraints The 3RW4425-3BC34 measures 170 mm wide by 192 mm high by 270 mm deep and mounts via screw fixing, not DIN rail — plan for four drilled holes on the backplate. Mounting position allows vertical surface with ±90° rotation and ±22.5° tilt front-to-back, giving flexibility in tight enclosures. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides — the top gap is critical for heat plume rise from the thyristor stack. ## Current ratings and thermal derating Minimum load is 8 % of the rated current — below that the soft starter may not trigger the thyristors reliably; check the motor magnetising current against this floor. ## Wiring and termination details Auxiliary and control circuit wiring uses spring-loaded terminals for 2x (24... 16 AWG) — no screw tightening, just push in for solid or ferruled stranded. Maximum motor cable length is 500 m — beyond that, reflected wave voltages on the motor terminals can stress the winding insulation, especially on 690 V systems. ## Protection and control features Integrated bypass contact system means the thyristors are shorted out after start — no continuous heat dissipation in the power stack during run, so the enclosure thermal load drops significantly. Adjustable current limitation lets you set the start current between the motor's no-load and locked-rotor values — useful for soft-starting conveyors or pumps without tripping upstream protection. Motor overload protection and intrinsic device protection are both built in — the soft starter monitors its own heatsink temperature and the motor thermal model, so an external overload relay is optional. Inside-delta wiring is supported — connect the soft starter in the delta loop of a six-lead motor to reduce the current rating needed per phase by about 58 %. ## Environmental and compliance data Pollution degree 3 per IEC 60947-4-2 — suitable for industrial environments with conductive dust or occasional condensation; the enclosure should maintain at least IP54 around the unit.","metaTitle":"Siemens 3RW4425-3BC34 Soft Starter, 99A, SIRIUS Series","metaDescription":"Siemens SIRIUS 3RW4425-3BC34 soft starter, 99A at 40°C, 690V insulation, integrated bypass, adjustable current limit. 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 (0.25 ... 1.5 mm²)","Width":"170mm","title":"3RW4425-3BC34","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 spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5525-3HA14<<","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 (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":"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%","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/2809e9bc9644d24d61b04efb46940dce.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=153086&mlfb=3RW4425-3BC34"},"ai":{"faq":[{"question":"What is the 3RW4425-3BC34 depth?","answer":"Listed depth is 270 mm. Combined with 170 mm width and 192 mm height, the unit occupies a 170 x 192 mm footprint on the backplate."},{"question":"What wire sizes does the 3RW4425-3BC34 accept on the main circuit?","answer":"For larger cables, use the front or back clamping points rated 10... 2/0 AWG."},{"question":"Does the 3RW4425-3BC34 support inside-delta wiring?","answer":"Yes, inside-delta circuit connection is supported. This allows a lower current-rated soft starter to control a higher-current motor by connecting in the delta leg."},{"question":"What compliance documentation is available for 3RW4425-3BC34?","answer":"The unit carries pollution degree 3 per IEC 60947-4-2. Standard Siemens documentation includes CE, UKCA, and cULus declarations — confirm specific certificate numbers at RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4425-3BC34","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/3RW4425-3BC34 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}}