{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2125-8HN42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2125-8HN42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2125-8HN42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2125-8HN42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2125-8HN42-0AA0, molded case circuit breaker, 4-pole, 25 A continuous, 440 kA breaking capacity at 240 V, ETU350 release, line protection.","salesMarkdown":"The Siemens SENTRON 3VA2125-8HN42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 25 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. It carries a 300 A frame, meaning the interrupting mechanism and bus are sized for that maximum, while the trip unit is set for 25 A. Breaking capacity hits 440 kA at 240 V, 330 kA at 415 V, 220 kA at 500 V, and 52.5 kA at 690 V, so it handles high-fault utility feeds and transformer secondaries without cascading upstream. The 86 mm depth (3.39 in) is the dimension from the mounting surface to the front of the breaker — check gland-plate clearance if the panel door closes tight. For a 25 A feeder on a 1000 kVA transformer secondary (prospective fault current typically 25–50 kA), this breaker has substantial headroom. The ETU350 release allows field-adjustable long-time pickup and short-time delay, so you can coordinate with downstream breakers without changing the trip unit.","metaTitle":"Siemens 3VA2125-8HN42-0AA0 SENTRON MCCB, 4P, 25A, 440 kA","metaDescription":"Siemens SENTRON 3VA2125-8HN42-0AA0 molded case circuit breaker, 4-pole, 25 A continuous, 440 kA at 240 V. Current lifecycle stage. Quoted to order against RFQ.","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":"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":"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":"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=143336&mlfb=3VA2125-8HN42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2125-8HN42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA2125-8HN42-0AA0 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 for a firm price and lead time."},{"question":"What is the closest functional second-source to 3VA2125-8HN42-0AA0?","answer":"The 3VA2125-8KQ42-0AA0 is the closest peer — same 300 A frame, 4 poles, ETU350 release, and mounting footprint. The difference is in the accessory or communication option; the breaker body and trip unit are identical."},{"question":"Will 3VA2125-8HN42-0AA0 drop into a panel specified around 3VA2125-8KQ42-0AA0?","answer":"Yes. Both use the same 300 A frame, same 140 mm width, 181 mm height, and 86 mm depth. No rewiring or cutout modification needed."},{"question":"What compliance documentation is available for 3VA2125-8HN42-0AA0?","answer":"As a Siemens SENTRON MCCB, it carries CE marking for the European market and is designed to IEC 60947-2. RoHS and REACH declarations are standard from Siemens. UL/CSA listings depend on the specific variant — verify with the order code suffix for your region."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2125-8HN42-0AA0","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/3VA2125-8HN42-0AA0 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}}