{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2125-8HM42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2125-8HM42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2125-8HM42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2125-8HM42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON series, molded case circuit breaker, 3VA2125-8HM42-0AA0, 25 A rated, 4-pole, 440 kA breaking at 240 VAC, line protection design.","salesMarkdown":"## Breaking capacity at system voltage This MCCB delivers 440 kA at 240 VAC, 330 kA at 415 VAC and 440 VAC, 220 kA at 500 VAC, and 52.5 kA at 690 VAC. The 3VA2125-8HM42-0AA0 carries a current-production lifecycle status. ## Ground-fault and temperature performance The ground-fault monitoring uses summation current formation on L + N conductors — it watches the vector sum, not just a single path. That 4-pole width is standard for a 25 A frame MCCB — it occupies one full DIN-rail mounting space on a panel backplate. Power loss is only 0.5 W maximum, so heat buildup inside a sealed enclosure is negligible.","metaTitle":"Siemens 3VA2125-8HM42-0AA0 MCCB, 25 A, 4-Pole, 440 kA at 240","metaDescription":"Siemens SENTRON 3VA2125-8HM42-0AA0 molded case circuit breaker, 25 A continuous, 4-pole, 440 kA breaking capacity at 240 VAC. Current production. Sourced 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":"38 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","Initial Value":"15 A","Trip Indicator":"No","Number Of Poles":"4","Voltage Trigger":"No","lifecycle_stage":"current","Full-Scale Value":"25 A","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":"Summation current formation L + N conductor","Continuous Current / Rated Value":"25 A","Insulation Voltage / Rated Value":"800 V","Design Of The Overcurrent Release":"ETU330","protection class IP / on the front":"IP40","design of the N-conductor protection":"adjustable OFF; 100%","Product Function / Grounding Protection":"Yes","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":"LIG","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=507503&mlfb=3VA2125-8HM42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2125-8HM42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"How do I get pricing and availability for 3VA2125-8HM42-0AA0?","answer":"Submit an RFQ through this listing. The part is sourced to order, and current pricing and stock availability are confirmed at quote time."},{"question":"Will 3VA2125-8HM42-0AA0 drop into a panel specified around 5SQ2670-2YA63 without rewiring?","answer":"No — the 3VA2125-8HM42-0AA0 is a Siemens SENTRON MCCB, while the 5SQ2670-2YA63 is a different manufacturer's device. Panel footprint, bus bar centers, and terminal arrangements differ. A mechanical fit assessment is required before substitution."},{"question":"What is the 3VA2125-8HM42-0AA0's depth?","answer":"The depth is 86 mm (3.39 inches), measured from the mounting surface to the front of the breaker body."},{"question":"What compliance documentation does Siemens provide for this MCCB?","answer":"The 3VA2125-8HM42-0AA0 is a Siemens SENTRON series product. Standard documentation includes RoHS and REACH declarations, plus IEC 60947-2 test certificates. UL/CSA listings vary by variant — verify the specific suffix code against the manufacturer's compliance database."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2125-8HM42-0AA0","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/3VA2125-8HM42-0AA0 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}}