{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2450-7KQ42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2450-7KQ42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2450-7KQ42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2450-7KQ42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2450-7KQ42-0AA0, Molded case circuit breaker, Line protection, 4-pole, 500 A, ETU860 electronic trip unit, 330 kA at 240 V.","salesMarkdown":"## What this 500 A breaker is built for This is a line-protection version, meaning it's set up for feeder and main breaker duty — protecting cables and busbars from overloads and short circuits in distribution panels, not for direct motor starting. This breaker's interrupting rating varies significantly with system voltage. At 240 V it's rated 330 kA, at 415 V and 440 V it's 242 kA, at 500 V it drops to 187 kA, and at 690 V it's 9 kA. The ETU860 electronic trip unit supports adjustable I²t curves and zone-selective interlocking, which helps keep nuisance trips off the main breaker during downstream faults. ## Thermal derating and real-world panel conditions The 500 A rating holds steady up to 50 °C ambient. Above that, it derates linearly: 477 A at 55 °C, 455 A at 60 °C, 432 A at 65 °C, and 410 A at 70 °C. The front face is rated IP40, so it's fine for general indoor panel use but not for washdown areas. ## Mounting and integration into a panel This breaker bolts into a panel on a mounting plate — it's not a DIN-rail snap-on unit. Dimensions are 248 mm high, 184 mm wide, and 110 mm deep. That 110 mm depth means it'll fit in most standard deep enclosures, but check the gland plate clearance if you're retrofitting into a shallow box. The N-conductor protection is adjustable between OFF and 20% to 100% of the phase current, which is useful for sizing the neutral on systems with harmonic loads. The ground-fault monitoring uses summation current formation on L + N conductors.","metaTitle":"Siemens 3VA2450-7KQ42-0AA0 SENTRON MCCB, 500 A, 4-Pole, ETU8","metaDescription":"Siemens SENTRON 3VA2450-7KQ42-0AA0 molded case circuit breaker, 500 A rated current, 4-pole, ETU860 electronic trip unit, 330 kA at 240 V. Available to order. Quoted on request.","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":"500 A","at 45 °C":"500 A","at 50 °C":"500 A","at 55 °C":"477 A","at 60 °C":"455 A","at 65 °C":"432 A","at 70 °C":"410 A","Depth [in]":"4.3 in","Width [in]":"7.2 in","Height [in]":"9.8 in","Limited To 1 S":"6 kA","Number of poles":"4","Product version":"Line protection","lifecycle_stage":"current","Limited To 0.5 S":"6 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":"99 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-40 °C","Other Measurement Function":"Yes","Rated continuous current Iu":"500 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% bis100%","Reference code / acc. to DIN EN 81346-2":"Q","Adjustable response value time / tr max.":"20","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.":"500 A","Adjustable response value current / lg max.":"500 A","Adjustable response value current / lg min.":"100 A","Adjustable response value current / li max.":"7 000 A","Adjustable response value current / li min.":"750 A","Adjustable response value current / lr min.":"200 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.":"5 000 A","Adjustable response value current / Isd min.":"300 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/048755c248b213874cf8c037a6abf9b0.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=355808&mlfb=3VA2450-7KQ42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2450-7KQ42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3VA2450-7KQ42-0AA0 and how is it quoted?","answer":"This part is sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — no stock figures or lead-time numbers are published here."},{"question":"What is the breaking capacity of this MCCB at different voltages?","answer":"At 240 V it's 330 kA, at 415 V and 440 V it's 242 kA, at 500 V it's 187 kA, and at 690 V it's 9 kA."},{"question":"What trip unit does the 3VA2450-7KQ42-0AA0 use?","answer":"It uses the ETU860 electronic trip unit, which provides adjustable long-time, short-time, instantaneous, and ground-fault protection curves with zone-selective interlocking capability."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2450-7KQ42-0AA0","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/3VA2450-7KQ42-0AA0 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}}