{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2125-8HK42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2125-8HK42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2125-8HK42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2125-8HK42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2125-8HK42-0AA0, molded case circuit breaker, 4-pole, 25 A continuous, ETU340 electronic trip unit, breaking capacity 440 kA at 240 V AC.","salesMarkdown":"The Siemens 3VA2125-8HK42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 25 A continuous current with an ETU340 electronic trip unit. It carries a 440 kA interrupting capacity at 240 V AC and 330 kA at 415 V AC, making it suitable for high-fault-current industrial distribution panels where selectivity and arc-flash compliance drive the spec. The 440 kA at 240 V and 330 kA at 415 V are the maximum fault currents this MCCB can safely interrupt without welding or rupturing. That rating governs SCCR (short-circuit current rating) for the downstream panel — if your transformer or utility feed can deliver fault current up to 440 kA at 240 V, this breaker clears it without cascading failure upstream. At 690 V the rating drops to 52.5 kA, still well above typical industrial service-entrance levels. ## Thermal derating and continuous current Rated 25 A continuous from 40 °C through 70 °C ambient — no derating curve to calculate across the typical panel temperature range. That flat profile simplifies BOM sizing: if the load draws 25 A or less, this breaker holds at any ambient up to 70 °C. The ETU340 electronic trip allows adjustable overload and short-circuit thresholds, so the same frame covers a range of downstream cable and load protection settings. Measures 140 mm wide by 181 mm tall by 86 mm deep — a 4-pole frame that fits standard MCCB panel cutouts.","metaTitle":"Siemens 3VA2125-8HK42-0AA0 MCCB, 25 A, 4-Pole, 440 kA at 240","metaDescription":"Siemens SENTRON 3VA2125-8HK42-0AA0 molded case circuit breaker, 25 A continuous, 4-pole, ETU340 release. Breaking capacity 440 kA at 240 V. Current production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"86 mm","Width":"140 mm","Height":"181 mm","Maximum":"375 A","Minimum":"375 A","at 240 V":"440 kA","at 415 V":"330 kA","at 440 V":"330 kA","at 500 V":"220 kA","at 690 V":"52.5 kA","at 40 °C":"25 A","at 45 °C":"25 A","at 50 °C":"25 A","at 55 °C":"25 A","at 60 °C":"25 A","at 65 °C":"25 A","at 70 °C":"25 A","Depth [In]":"3.39 in","Width [In]":"5.51 in","Height [In]":"7.13 in","Trip Indicator":"No","Number Of Poles":"4","Voltage Trigger":"No","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Molded case circuit breaker","Undervoltage Release":"No","Design Of The Product":"Line protection","Communication Function":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"0.5 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Ground-Fault Monitoring Version":"Without","Continuous Current / Rated Value":"25 A","Insulation Voltage / Rated Value":"800 V","Design Of The Overcurrent Release":"ETU340","protection class IP / on the front":"IP40","design of the N-conductor protection":"adjustable OFF; 100%","Product Function / Grounding Protection":"No","operating voltage / at AC / rated value":"690 V","reference code / according to IEC 81346-2":"Q","Continuous Current / Rated Value / Maximum":"160 A","Product Extension / Optional / Motor Drive":"Yes","Protection Function Of The Overcurrent Release":"ELISA LI","number of CO contacts / for auxiliary contacts":"0","Switching Capacity Class Of The Circuit Breaker":"L","Mechanical Service Life (Operating Cycles) / Typical":"25 000","Type Of Electrical Connection / For Main Current Circuit":"on both sides nut keeper kit","Arrangement Of Electrical Connectors / For Main Current Circuit":"Front terminal"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/641a6843e8dc2f758bb6426196efa871.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=304441&mlfb=3VA2125-8HK42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2125-8HK42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What is 3VA2125-8HK42-0AA0's listed depth?","answer":"The depth is 86 mm (3.39 in). This is the overall dimension including the arc chamber and rear terminal connections."},{"question":"What is 3VA2125-8HK42-0AA0's listed width?","answer":"The width is 140 mm (5.51 in), which is the standard 4-pole frame width for this SENTRON MCCB platform."},{"question":"Where can I buy 3VA2125-8HK42-0AA0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation does this breaker carry?","answer":"As a SENTRON MCCB, it is designed to meet IEC 60947-2 and UL 489 standards for molded case circuit breakers. Specific certifications (UL, CSA, CE, UKCA, EAC) should be verified against the unit's marking label for the exact shipment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2125-8HK42-0AA0","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/3VA2125-8HK42-0AA0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}