{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2340-0KQ42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2340-0KQ42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2340-0KQ42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2340-0KQ42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2 molded case circuit breaker, 400 A, 4-pole, ETU860 electronic trip unit, 440 kA breaking capacity at 415 V, line protection design.","salesMarkdown":"## What this 400 A MCCB really delivers The Siemens 3VA2340-0KQ42-0AA0 is a SENTRON 3VA2 molded case circuit breaker rated for 400 A continuous current, with an ETU860 electronic trip unit that adjusts from 600 A minimum to 4800 A maximum — that's a wide 8:1 range for coordinating with transformer inrush or motor starting curves without swapping the breaker frame. Breaking capacity hits 440 kA at 415 V and still holds 187 kA at 690 V, which puts this squarely into high-fault industrial switchgear — think large motor control centers, transformer secondaries, or main feeders where the available fault current is serious enough to vaporize a standard 65 kA breaker. The 4-pole configuration with summation ground-fault monitoring (L + N conductor) means it can serve as a main breaker in a TN or TT system where the neutral needs both protection and ground-fault detection, not just a switched neutral bar. Communication function is built in — the ETU860 supports the SENTRON communication platform for power monitoring and remote trip indication, so this breaker can report its status back to a BMS or SCADA without an add-on module. ## Thermal limits — where the rating holds and where it drops At 55 °C it derates to 375 A, at 60 °C to 350 A, at 65 °C to 325 A, and at 70 °C to 300 A. In a multi-breaker lineup, that heat adds up and drives ventilation sizing. ## Panel fit and physical integration Dimensions are 248 mm high, 184 mm wide, 110 mm deep — a 4-pole frame that fits standard Siemens 3VA2 mounting patterns. The IP40 front protection means it's suitable for enclosed switchgear where the door provides the full IP rating; it's not a standalone outdoor breaker without an enclosure. The N-conductor protection is adjustable from OFF to 20%–100% of the phase current, which lets you match the neutral protection to the harmonic load profile — critical for data center or VFD-heavy panels where triplen harmonics overload the neutral.","metaTitle":"Siemens 3VA2340-0KQ42-0AA0 SENTRON MCCB, 400 A, 440 kA at 41","metaDescription":"Siemens 3VA2340-0KQ42-0AA0 SENTRON molded case circuit breaker. 400 A continuous, 440 kA breaking at 415 V. ETU860 electronic trip. Current production. Quoted to order.","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","title":"3VA2340-0KQ42-0AA0","Height":"248 mm","Maximum":"4 800 A","Minimum":"600 A","at 415 V":"440 kA","at 690 V":"187 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 E Icu=200 kA @ 415 V 4-pole, line protection ETU860, LSIG, In=400A overload protection Ir=160A... 400A short circuit protection Isd=0,6...10xIn, Ii=1,5...12xIn neutral protection adjustable(OFF up to 100%) busbar connection","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":"Yes","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":"ETU860","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":"E","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=1417864&mlfb=3VA2340-0KQ42-0AA0"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2340-0KQ42-0AA0","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/3VA2340-0KQ42-0AA0 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}}