{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2340-4JQ42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2340-4JQ42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2340-4JQ42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2340-4JQ42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2340-4JQ42-0AA0, molded case circuit breaker, 400 A rated current, 4-pole, line protection design, 110 x 184 x 248 mm.","salesMarkdown":"Its interrupting capacity reaches 121 kA at 240 V AC and 75.6 kA at 415/440 V, so it handles high-fault-current service entrances and industrial feeders without cascading upstream. ## Breaking capacity by voltage — where this breaker holds At 240 V the unit clears 121 kA, which covers most secondary-side transformer faults in 480/277 V distribution. At 415 V and 440 V it holds 75.6 kA, and at 500 V it still manages 52.5 kA. The drop to 7.5 kA at 690 V tells you this is a 600 V class breaker — not a 690 V main. For 690 V installations you'd step up to a higher-voltage frame. ## Thermal derating — don't size by the nameplate alone At 55 °C it derates to 375 A, at 60 °C to 350 A, and at 70 °C to 300 A. ## Ground-fault and communication provisions This MCCB includes a ground-fault monitoring version using summation current formation on the L+N conductor. The unit also has a communication function.","metaTitle":"Siemens 3VA2340-4JQ42-0AA0 SENTRON MCCB, 400 A, 4-Pole","metaDescription":"Siemens SENTRON 3VA2340-4JQ42-0AA0 molded case circuit breaker, 400 A continuous, 4-pole, 121 kA at 240 V. Current lifecycle stage. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"110 mm","Width":"184 mm","title":"3VA2340-4JQ42-0AA0","Height":"248 mm","Maximum":"4 000 A","Minimum":"600 A","at 240 V":"121 kA","at 415 V":"75.6 kA","at 440 V":"75.6 kA","at 500 V":"52.5 kA","at 690 V":"7.5 kA","at 40 °C":"400 A","at 45 °C":"400 A","at 50 °C":"400 A","at 55 °C":"375 A","at 60 °C":"350 A","at 65 °C":"325 A","at 70 °C":"300 A","Depth [In]":"4.33 in","Width [In]":"7.24 in","Height [In]":"9.76 in","description":"circuit breaker 3VA2 IEC frame 400 breaking capacity class S Icu=36kA @ 415V 4-pole, line protection ETU560, LSIG, In=400A overload protection Ir=160A...400A short-circuit protection Isd=0.6..10x In, Ii=1.5..10x In N conductor protection adjustable (OFF, up to 100%) gr.-fault prot., can be sw. off Ig=0.2...1 x In= tg=0.05-0.8s nut keeper kit","Initial Value":"80 A","Trip Indicator":"No","Number Of Poles":"4","Voltage Trigger":"No","lifecycle_stage":"current","Full-Scale Value":"400 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":"96 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":"400 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; 20% to 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":"400 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":"S","Mechanical Service Life (Operating Cycles) / Typical":"20 000","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/c1b3b6c5f6d67465025ac41848ceb75e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=906683&mlfb=3VA2340-4JQ42-0AA0"},"ai":{"faq":[{"question":"What is the depth of 3VA2340-4JQ42-0AA0?","answer":"The depth is 110 mm (4.33 in), with a width of 184 mm (7.24 in) and height of 248 mm (9.76 in)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2340-4JQ42-0AA0","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/3VA2340-4JQ42-0AA0 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}}