{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2125-6HM42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2125-6HM42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2125-6HM42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2125-6HM42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2 series, 4-pole molded case circuit breaker, 25 A rated, ETU330 electronic trip unit, breaking capacity 242 kA at 240 V AC.","salesMarkdown":"The Siemens 3VA2125-6HM42-0AA0 is a 4-pole SENTRON molded case circuit breaker (MCCB) with an electronic ETU330 trip unit, rated 25 A continuously across its full ambient range from 40 °C to 70 °C. That flat derating curve means you don't lose headroom as the panel warms up — a real advantage in a crowded enclosure where a thermal-magnetic breaker would start derating above 40 °C. ## Breaking capacity — what those kA numbers mean on your bus At 500 V it still holds 121 kA, and at 690 V it drops to 3.7 kA. The 690 V figure is low because the arc energy at that voltage stresses the internal arc chutes; if your circuit runs 690 V with high fault current, you need a different frame. ## Integration notes — panel fit and N-wire handling The N-conductor protection is adjustable: OFF or 100% of the phase rating, which matters when you're feeding a 3-phase load with a shared neutral that doesn't need overcurrent protection, or a single-phase subfeed that does. Front IP40 keeps out tools and fingers but isn't rated for washdown — this lives inside a dry enclosure.","metaTitle":"Siemens 3VA2125-6HM42-0AA0 SENTRON MCCB, 25A 4-Pole, 242kA a","metaDescription":"Siemens 3VA2125-6HM42-0AA0 SENTRON molded case circuit breaker, 25 A rated, 4-pole, ETU330 trip unit. Breaking capacity 242 kA at 240 V. Current lifecycle active. Sourced 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","at 240 V":"242 kA","at 415 V":"187 kA","at 440 V":"187 kA","at 500 V":"121 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","Product version":"Line protection","Voltage Trigger":"No","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Molded case circuit breaker","Undervoltage Release":"No","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","Courant permanent assigné Iu":"25 A","Ground-Fault Monitoring Version":"Summation current formation L + N conductor","Tension assignée d'isolement Ui":"800 V","Design Of The Overcurrent Release":"ETU330","protection class IP / on the front":"IP40","design of the N-conductor protection":"adjustable OFF; 100%","reference code / acc. to IEC 81346-2":"Q","Product Extension / Optional / Motor Drive":"Yes","Adjustable response value current / lg max.":"25 A","Adjustable response value current / lg min.":"15 A","Adjustable response value current / li max.":"300 A","Adjustable response value current / li min.":"38 A","Neutral conductors / upgradeable/retrofittable":"No","Protection Function Of The Overcurrent Release":"LIG","number of CO contacts / for auxiliary contacts":"0","Switching Capacity Class Of The Circuit Breaker":"H","Max. rated operational current of the frame size":"160 A","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","Type of connectable conductor cross-section, connection screw, width x thickness , min.":"13 x 1 mm"}},"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=161163&mlfb=3VA2125-6HM42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2125-6HM42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3VA2125-6HM42-0AA0?","answer":"This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the breaking capacity of this MCCB at 415 V?","answer":"187 kA at 415 V AC, which covers most industrial distribution board fault levels without needing upstream fusing."},{"question":"Does the 3VA2125-6HM42-0AA0 have an adjustable neutral protection?","answer":"Yes, the N-conductor protection is adjustable to OFF or 100% of the phase rating, giving flexibility for 3-phase or single-pole subfeeds."},{"question":"What trip unit does this breaker use?","answer":"An electronic ETU330 trip unit, which provides the flat 25 A rating across the full 40–70 °C ambient range without derating."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2125-6HM42-0AA0","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/3VA2125-6HM42-0AA0 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}}