{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2340-5JQ42-0AC0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2340-5JQ42-0AC0","canonicalUrl":"https://aoctrl.com/siemens/3VA2340-5JQ42-0AC0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2340-5JQ42-0AC0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2340-5JQ42-0AC0, molded case circuit breaker, 4-pole, 400 A rated current, 187 kA breaking capacity at 240 V AC, line protection design with communication function.","salesMarkdown":"Its 400 A frame carries a continuous current rating of 400 A up to 50 °C ambient, then derates linearly to 300 A at 70 °C — so in a warm panel (say 55 °C) you get 375 A of headroom, not the full 400. The interrupting ratings span 187 kA at 240 V AC down to 7.5 kA at 690 V AC, which tells you this breaker is built for high-fault 480 V and below distribution, not for 690 V motor circuits where the SCCR drops sharply. The adjustable overload trip range of 600 A to 4 000 A (likely the magnetic/instantaneous band, not the thermal) gives selectivity flexibility downstream. ## Thermal management and panel integration The breaker dissipates up to 96 W at full rated load. That heat has to leave the enclosure — plan for ventilation or a larger panel if you're grouping several of these in a single cabinet. The 4-pole width (184 mm / 7.24 in) matches the typical SENTRON 4-pole slot; verify the busbar or lug kit spacing if retrofitting into an existing panel.","metaTitle":"Siemens 3VA2340-5JQ42-0AC0 SENTRON MCCB, 400 A, 4-Pole, 187","metaDescription":"Siemens SENTRON 3VA2340-5JQ42-0AC0 molded case circuit breaker, 400 A, 4-pole, 187 kA breaking capacity at 240 VAC. Current production. Quoted to order. Request RFQ.","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","Height":"248 mm","Maximum":"4 000 A","Minimum":"600 A","at 240 V":"187 kA","at 415 V":"121 kA","at 440 V":"121 kA","at 500 V":"75.6 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","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","Of The Supplied Basic Switch":"3VA2340-5JQ42-0AA0","Design Of The Auxiliary Switch":"2 auxiliary switches HQ","Design Of The Auxiliary Release":"Without auxiliary release","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":"2","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AA12","Switching Capacity Class Of The Circuit Breaker":"M","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,"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=521581&mlfb=3VA2340-5JQ42-0AC0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2340-5JQ42-0AC0/alternatives.json"},"ai":{"faq":[{"question":"What is 3VA2340-5JQ42-0AC0's listed depth?","answer":"The depth is 110 mm (4.33 in). This is the body depth; allow additional clearance for the operating handle throw and rear connection terminals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2340-5JQ42-0AC0","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/3VA2340-5JQ42-0AC0 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}}