{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2125-6JQ42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2125-6JQ42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2125-6JQ42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2125-6JQ42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"SENTRON 3VA2125-6JQ42-0AA0, molded case circuit breaker, 4-pole, 25 A continuous, 242 kA breaking capacity at 240 V, line protection with ground-fault monitoring.","salesMarkdown":"At 415 V it still holds 187 kA, and at 690 V it drops to 3.7 kA — so the real-world fit depends on the available fault current at your service voltage. If your panel has a 200 kA prospective fault at 240 V, this breaker handles it; if the same panel runs at 690 V with a 10 kA fault, the 3.7 kA rating is insufficient and you need a higher-rated MCCB. That is a 25 A frame with a 25 A thermal-magnetic trip unit (fixed, not adjustable). Ground-fault monitoring is built in via summation current formation on L + N conductor — it compares the vector sum of phase and neutral currents and trips if leakage exceeds the threshold. That saves an external ground-fault relay and CT, but note it monitors only the L+N summation, not individual phase-to-ground leakage. For applications requiring per-phase ground-fault detection, you would add a separate module. The 140 mm width for a 4-pole unit is typical; verify your enclosure's DIN-rail span or backplate space before committing the BOM. The communication function suggests a plug-in communication module (PROFIBUS, PROFINET, or Modbus) that clips onto the front — that module adds no extra width but may protrude forward, so check the door clearance.","metaTitle":"3VA2125-6JQ42-0AA0 SENTRON MCCB, 4-pole, 25 A, 242 kA at 240","metaDescription":"SENTRON 3VA2125-6JQ42-0AA0 molded case circuit breaker, 4-pole, 25 A continuous, 242 kA breaking at 240 V. Line protection with ground-fault monitoring. Available to order — reques","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":"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","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":"Yes","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":"Summation current formation L + N conductor","Continuous Current / Rated Value":"25 A","Insulation Voltage / Rated Value":"800 V","Design Of The Overcurrent Release":"ETU560","protection class IP / on the front":"IP40","design of the N-conductor protection":"adjustable OFF; 40% to 160%","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":"LSIG","number of CO contacts / for auxiliary contacts":"0","Switching Capacity Class Of The Circuit Breaker":"H","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=459662&mlfb=3VA2125-6JQ42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2125-6JQ42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3VA2125-6JQ42-0AA0 at different voltages?","answer":"At 240 V it is 242 kA, at 415 V and 440 V it is 187 kA, at 500 V it is 121 kA, and at 690 V it is 3.7 kA. The 690 V rating is the limiting factor — verify your available fault current at that voltage."},{"question":"Does 3VA2125-6JQ42-0AA0 include ground-fault protection?","answer":"Yes, it has built-in ground-fault monitoring via summation current formation on the L + N conductor. It does not require an external ground-fault relay or CT for that function."},{"question":"What are the physical dimensions of 3VA2125-6JQ42-0AA0?","answer":"Width 140 mm, height 181 mm, depth 86 mm. The 86 mm depth is the body; allow extra for the handle throw and cable bending."},{"question":"Where can I buy 3VA2125-6JQ42-0AA0 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 quote."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2125-6JQ42-0AA0","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/3VA2125-6JQ42-0AA0 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}}