{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2340-5KP42-0AL0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2340-5KP42-0AL0","canonicalUrl":"https://aoctrl.com/siemens/3VA2340-5KP42-0AL0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2340-5KP42-0AL0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2340-5KP42-0AL0, molded case circuit breaker, 4-pole, 400 A, ETU850 electronic trip unit, 187 kA at 240 V, line protection version.","salesMarkdown":"The Siemens SENTRON 3VA2340-5KP42-0AL0 is a 4-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, carrying the full 400 A up to 50 °C before derating begins — at 55 °C it holds 375 A, at 70 °C it holds 300 A. That thermal profile means this breaker can sit in a warm enclosure without stepping down a frame size, as long as the ambient inside the panel stays under 50 °C. The ETU850 electronic trip unit handles the overcurrent protection logic. It is a line protection version — meaning it is set up for feeder protection rather than motor or generator duty — and it communicates, so you get trip data and status back to the control system without separate aux contacts. Breaking capacity is 187 kA at 240 V, 121 kA at 415 V, 55 kA at 440 V, 36 kA at 500 V, and 7.5 kA at 690 V. At typical 400 V class distribution voltages, that 121 kA rating covers high-fault locations like substation feeders or large bus risers without needing a current-limiting upstream breaker. Dimensions are 110 mm deep, 184 mm wide, 248 mm tall — a standard 4-pole MCCB footprint that fits Siemens SENTRON mounting accessories and busbar systems. ## Panel integration — what the specs mean for the wireman The 184 mm width fits a 4-pole MCCB slot in a typical Siemens panelboard or standalone enclosure. Power loss is 96 W maximum at rated current — that is the heat the enclosure must dissipate. In a sealed cabinet, factor that into the thermal calculation alongside other devices.","metaTitle":"Siemens 3VA2340-5KP42-0AL0 SENTRON MCCB, 400 A, 187 kA at 24","metaDescription":"Siemens SENTRON 3VA2340-5KP42-0AL0 molded case circuit breaker, 400 A rated continuous current, ETU850 trip unit, 187 kA at 240 V breaking capacity, 4-pole line protection. Availab","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","at 240 V":"187 kA","at 415 V":"121 kA","at 440 V":"55 kA","at 500 V":"36 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]":"4.3 in","Width [in]":"7.2 in","Height [in]":"9.8 in","Trip indicator":"Yes","Number of poles":"4","Product version":"Line protection","Voltage trigger":"No","lifecycle_stage":"current","Product brand name":"SENTRON","Product designation":"Molded case circuit breaker","Latching - endurance":"20 000","Undervoltage Release":"No","Communication Function":"Yes","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","Power loss [W] / maximum":"96 W","Auxiliary contact version":"2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch HQ","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"Yes","Rated continuous current Iu":"400 A","Rated insulation voltage Ui":"800 V","Design of the auxiliary release":"Without auxiliary release","Ground fault monitoring version":"Without","Design of the overcurrent release":"ETU850","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.":"17","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","Undervoltage Release With Leading Contact":"No","Product extension / optional / motor drive":"Yes","Adjustable response value current / Ir max.":"400 A","Adjustable response value current / li max.":"4 000 A","Adjustable response value current / li min.":"600 A","Adjustable response value current / lr min.":"160 A","Adjustable response value current / Isd max.":"4 000 A","Adjustable response value current / Isd min.":"240 A","Neutral conductors / upgradeable/retrofittable":"No","Number of CO contacts / for auxiliary contacts":"4","Protective function of the overcurrent release":"LSI","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AB22","Switching capacity class of the circuit breaker":"M","Max. rated operational current of the frame size":"400 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","Type of connectable conductor cross-section, connection screw, width x thickness , max.":"35 x 10","Type of connectable conductor cross-section, connection screw, width x thickness , min.":"20 x 1"}},"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=1344279&mlfb=3VA2340-5KP42-0AL0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2340-5KP42-0AL0/alternatives.json"},"ai":{"faq":[{"question":"What is 3VA2340-5KP42-0AL0's listed depth?","answer":"The depth is 110 mm (4.3 in)."},{"question":"What is 3VA2340-5KP42-0AL0's listed width?","answer":"The width is 184 mm (7.2 in)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2340-5KP42-0AL0","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/3VA2340-5KP42-0AL0 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}}