{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2125-7HN42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2125-7HN42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2125-7HN42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2125-7HN42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2125-7HN42-0AA0, molded case circuit breaker, 4-pole, 25 A continuous, ETU350 electronic trip unit, interrupting capacity 330 kA at 240 V.","salesMarkdown":"The Siemens SENTRON 3VA2125-7HN42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 25 A continuous current, built around the ETU350 electronic trip unit. It's designed for line protection in distribution panels, with an interrupting capacity that reaches 330 kA at 240 V and stays above 240 kA through 440 V — that's the kind of headroom you want when coordinating with downstream breakers in a high-fault industrial service. The 25 A continuous rating holds flat across the entire operating temperature range from 40 °C to 70 °C — no derating curve to worry about in a warm panel. The 800 V rated insulation voltage means it's comfortable on 480 V or 600 V class systems with margin. Interrupting capacity drops to 3.7 kA at 690 V — that's still adequate for most 690 V motor control centers, but if your fault current at that voltage is higher, you'll need a current-limiting upstream device or a higher-rated frame. The 4-pole configuration suits three-phase systems with a switched neutral or dual-supply applications. The breaker measures 140 mm wide, 181 mm tall, and 86 mm deep — that's a standard SENTRON 3VA2 frame footprint.","metaTitle":"Siemens 3VA2125-7HN42-0AA0 SENTRON MCCB, 25 A, 4-Pole, ETU35","metaDescription":"Siemens SENTRON 3VA2125-7HN42-0AA0 molded case circuit breaker, 25 A continuous, 4-pole, ETU350 trip unit. Interrupting capacity 330 kA at 240 V. Current lifecycle stage. Sourced t","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":"300 A","Minimum":"300 A","at 240 V":"330 kA","at 415 V":"242 kA","at 440 V":"242 kA","at 500 V":"187 kA","at 690 V":"3.7 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":"0.6 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":"ETU350","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":"LSI","number of CO contacts / for auxiliary contacts":"0","Switching Capacity Class Of The Circuit Breaker":"C","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=303292&mlfb=3VA2125-7HN42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2125-7HN42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the interrupting capacity of this MCCB at 240 V?","answer":"At 240 V the interrupting capacity is 330 kA, dropping to 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V."},{"question":"What trip unit does the 3VA2125-7HN42-0AA0 use?","answer":"It uses the ETU350 electronic trip unit, which provides adjustable overload and short-circuit protection with better selectivity than thermal-magnetic trip units."},{"question":"Where can I buy 3VA2125-7HN42-0AA0 and get current pricing?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2125-7HN42-0AA0","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/3VA2125-7HN42-0AA0 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}}