{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2440-7KQ42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2440-7KQ42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2440-7KQ42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2440-7KQ42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2440-7KQ42-0AA0, molded case circuit breaker, 4-pole, 400 A, ETU860 electronic trip unit, breaking capacity 330 kA at 240 V.","salesMarkdown":"It delivers a breaking capacity of 330 kA at 240 V, tapering to 242 kA at 415 V and 440 V, then 187 kA at 500 V, and 9 kA at 690 V — the 690 V figure is the one to watch for 690 V line-side faults; at that voltage the breaker is still adequate for most downstream coordination but the margin narrows. The ETU860 provides adjustable N-conductor protection (OFF, 20 % to 130 %) and ground-fault monitoring via summation current formation on L+N, so it handles both phase and residual current detection without a separate module. ## Thermal derating and integration The breaker carries its full 400 A rating up to 50 °C ambient; above that it derates to 376 A at 55 °C, 352 A at 60 °C, 324 A at 65 °C, and 300 A at 70 °C. For a panel builder, that means a 400 A bus can be served without oversizing the breaker as long as the enclosure ambient stays under 50 °C — beyond that, the derating curve governs the actual ampacity. The maximum power loss is 63.3 W, so ventilation or spacing in a sealed enclosure should account for that heat.","metaTitle":"Siemens 3VA2440-7KQ42-0AA0 SENTRON MCCB, 400 A, 4-Pole, ETU8","metaDescription":"Siemens SENTRON 3VA2440-7KQ42-0AA0 molded case circuit breaker, 400 A continuous, 4-pole, ETU860 electronic trip, 330 kA at 240 V. 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":"110 mm","Width":"184 mm","Height":"248 mm","at 240 V":"330 kA","at 415 V":"242 kA","at 440 V":"242 kA","at 500 V":"187 kA","at 690 V":"9 kA","at 40 °C":"400 A","at 45 °C":"400 A","at 50 °C":"400 A","at 55 °C":"376 A","at 60 °C":"352 A","at 65 °C":"324 A","at 70 °C":"300 A","Depth [in]":"4.3 in","Width [in]":"7.2 in","Height [in]":"9.8 in","Limited To 1 S":"5 kA","Number of poles":"4","Product version":"Line protection","lifecycle_stage":"current","Limited To 0.5 S":"5 kA","Product brand name":"SENTRON","Product designation":"Molded case circuit breaker","Latching - endurance":"15 000","Communication Function":"Yes","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","Power loss [W] / maximum":"63.3 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-40 °C","Other Measurement Function":"Yes","Rated continuous current Iu":"400 A","Rated insulation voltage Ui":"800 V","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% bis130%","Reference code / acc. to DIN EN 81346-2":"Q","Adjustable response value time / tr max.":"25","Adjustable response value time / tr min.":"0.5","Adjustable response value time / tsd max.":"0.5 s","Adjustable response value time / tsd min.":"0.05 s","Product extension / optional / motor drive":"Yes","Adjustable response value current / Ir max.":"400 A","Adjustable response value current / lg max.":"400 A","Adjustable response value current / lg min.":"80 A","Adjustable response value current / li max.":"6 000 A","Adjustable response value current / li min.":"600 A","Adjustable response value current / lr min.":"160 A","Adjustable response value current / tg max.":"0.8 s","Adjustable response value current / tg min.":"0.05 s","Adjustable response value current / Isd max.":"4 000 A","Adjustable response value current / Isd min.":"240 A","Ground fault protection can be switched ON/OFF":"Yes","Neutral conductors / upgradeable/retrofittable":"No","Number of CO contacts / for auxiliary contacts":"0","Protective function of the overcurrent release":"LSIG","Switching capacity class of the circuit breaker":"C","Max. rated operational current of the frame size":"630 A","Max. rated operational voltage Ue with AC 50/60Hz":"690 V","Type of electrical connection / for main current circuit":"Lug terminal","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/0eb36652ce522f093395d6bd0dd27e34.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=410397&mlfb=3VA2440-7KQ42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2440-7KQ42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3VA2440-7KQ42-0AA0 at 415 V?","answer":"At 415 V the breaking capacity is 242 kA; at 240 V it is 330 kA, and at 690 V it drops to 9 kA."},{"question":"What trip unit does this MCCB use?","answer":"It uses the ETU860 electronic trip unit with adjustable N-conductor protection (OFF, 20 % to 130 %) and ground-fault monitoring via summation current on L+N."},{"question":"Where can I buy 3VA2440-7KQ42-0AA0?","answer":"This part is sourced to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2440-7KQ42-0AA0","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/3VA2440-7KQ42-0AA0 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}}