{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2125-0HN42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2125-0HN42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2125-0HN42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2125-0HN42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2125-0HN42-0AA0, molded case circuit breaker, 4-pole, 25 A rated continuous current, ETU350 electronic trip unit, line protection design, IP40 front.","salesMarkdown":"## Breaking capacity and what it means for your fault level Those numbers tell you it's rated for high-fault-current installations — think industrial mains or transformer secondaries where prospective short-circuit current can exceed 100 kA. The 690 V rating also covers 600 V class北美 systems without derating the interrupt rating. ## Trip unit and N-conductor protection The ETU350 is an electronic trip unit with LSI protection curves — long-time, short-time, and instantaneous. N-conductor protection is adjustable: OFF or 100%, so you can set it for a fully rated neutral or leave it unprotected depending on the system grounding. No ground-fault monitoring version, no undervoltage release, no communication function — this is a plain-vanilla line-protection breaker, not a smart or GFCI variant. ## Temperature derating — the full band No derating needed across the normal panel temperature range. Maximum power loss is 0.5 W — negligible for panel heat budgeting.","metaTitle":"Siemens 3VA2125-0HN42-0AA0 SENTRON MCCB, 25 A, 4-Pole, ETU35","metaDescription":"Siemens SENTRON 3VA2125-0HN42-0AA0 molded case circuit breaker, 25 A continuous, 4-pole, ETU350 trip unit. 440 kA at 415 V. Active production, available to order. Request quote.","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","title":"3VA2125-0HN42-0AA0","Height":"181 mm","Maximum":"300 A","Minimum":"38 A","at 415 V":"440 kA","at 690 V":"187 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","description":"circuit breaker 3VA2 IEC frame 160 breaking capacity class E Icu=200 kA @ 415 V 4-pole, line protection ETU350, LSI, In=25A overload protection Ir=10A... 25A short circuit protection Isd=1,5...10xIr, Ii=12xIn neutral protection adjustable(OFF 100%) ground fault alarm alarm via EFB300 or COM busbar connection","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":"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":"E","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,"stockQuantity":0,"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=1417441&mlfb=3VA2125-0HN42-0AA0"},"ai":{"faq":[{"question":"Where can I buy 3VA2125-0HN42-0AA0 and how do I get a price?","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 and we'll respond with a firm price and lead time."},{"question":"What is the depth of 3VA2125-0HN42-0AA0?","answer":"The depth is 86 mm. That's the dimension from the mounting surface to the front of the breaker — relevant for gland-plate clearance or shallow enclosure fit."},{"question":"What is the width of 3VA2125-0HN42-0AA0?","answer":"The width is 140 mm. This is the standard 3VA2 frame width; a panel drilled for any 3VA2 breaker accepts this unit without rework."},{"question":"What compliance documentation does Siemens provide for this MCCB?","answer":"The SENTRON 3VA2 series carries IEC 60947-2 certification as a molded case circuit breaker. Standard documentation includes the declaration of conformity, CE marking, and RoHS/REACH compliance statements — available on request with the order."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2125-0HN42-0AA0","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/3VA2125-0HN42-0AA0 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}}