{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2340-5KQ42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2340-5KQ42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2340-5KQ42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2340-5KQ42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2340-5KQ42-0AA0, molded case circuit breaker, 4-pole, 400 A rated current, ETU860 electronic trip unit, 187 kA breaking capacity at 240 V AC, communication function.","salesMarkdown":"## 400 A MCCB with ETU860 — selectivity and communication in one frame The Siemens 3VA2340-5KQ42-0AA0 is a SENTRON molded case circuit breaker rated for 400 A continuous current at 40-50 °C ambient, with a 4-pole configuration and the ETU860 electronic trip unit. At 415 V and 440 V the breaker delivers 121 kA; at 500 V it still holds 75.6 kA; at 690 V it drops to 7.5 kA. ## Thermal derating and operating envelope The 400 A rating holds flat through 50 °C. Above that it derates: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. For a panel OEM wireman, the flat rating to 50 °C means no derating is needed in most ventilated enclosures — only tightly packed or unventilated panels above that threshold require a current reduction. ## ETU860 trip unit and protection features No undervoltage release or voltage trigger is fitted as standard. The trip indicator is absent — fault status is read through the communication interface or local LEDs on the trip unit. Dimensions are 248 mm height, 184 mm width, 110 mm depth. Maximum power loss is 96 W, which should be factored into enclosure thermal calculations for tightly packed switchboards.","metaTitle":"Siemens 3VA2340-5KQ42-0AA0 SENTRON MCCB, 400A 4P ETU860","metaDescription":"Siemens SENTRON 3VA2340-5KQ42-0AA0 molded case circuit breaker, 400A rated, 4-pole, ETU860 electronic trip unit. 187 kA at 240 V. Active production, available to order. Quoted on r","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"110 mm","Width":"184 mm","Height":"248 mm","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","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":"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":"Yes","rated insulation voltage Ui":"800 V","Courant permanent assigné Iu":"400 A","Ground-Fault Monitoring Version":"Summation current formation L + N conductor","Design Of The Overcurrent Release":"ETU860","protection class IP / on the front":"IP40","design of the N-conductor protection":"adjustable OFF; 20% to 100%","operating voltage / at AC / rated value":"690 V","reference code / according to IEC 81346-2":"Q","Product Extension / Optional / Motor Drive":"Yes","Adjustable response value current / lg max.":"400 A","Adjustable response value current / lg min.":"80 A","Adjustable response value current / li max.":"4 000 A","Adjustable response value current / li min.":"600 A","Neutral conductors / upgradeable/retrofittable":"No","Protection Function Of The Overcurrent Release":"LSIG","number of CO contacts / for auxiliary contacts":"0","Switching Capacity Class Of The Circuit Breaker":"M","Max. rated operational current of the frame size":"400 A","Mechanical Service Life (Switching 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","Type of connectable conductor cross-section, connection screw, width x thickness , max.":"35 x 10 mm","Type of connectable conductor cross-section, connection screw, width x thickness , min.":"20 x 1 mm"}},"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=458834&mlfb=3VA2340-5KQ42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2340-5KQ42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA2340-5KQ42-0AA0 and how is it quoted?","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 commercial offer."},{"question":"What is the breaking capacity of 3VA2340-5KQ42-0AA0 at 415 V?","answer":"At 415 V AC the breaking capacity is 121 kA. At 240 V it reaches 187 kA, and at 690 V it is 7.5 kA."},{"question":"What trip unit does the 3VA2340-5KQ42-0AA0 use?","answer":"It uses the ETU860 electronic trip unit, which supports adjustable N-conductor protection, ground-fault monitoring via summation current, and communication functions."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2340-5KQ42-0AA0","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/3VA2340-5KQ42-0AA0 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}}