{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2340-5HN42-0AF0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2340-5HN42-0AF0","canonicalUrl":"https://aoctrl.com/siemens/3VA2340-5HN42-0AF0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2340-5HN42-0AF0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2340-5HN42-0AF0, molded case circuit breaker, 4-pole, 400 A rated continuous current, 187 kA interrupting at 240 V, ETU350 release, line protection.","salesMarkdown":"## What this MCCB carries in the carton The Siemens SENTRON 3VA2340-5HN42-0AF0 is a 4-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, with an interrupting capacity of 187 kA at 240 V and 121 kA at 415 V. The basic switch supplied is 3VA2340-5HN42-0AA0, and the integrated auxiliary trip is 3VA9608-0BB11. No holes in the box for the core protection function. At 500 V the rating drops to 75.6 kA, and at 690 V to 17 kA — the interrupting curve follows system voltage. For a 400 A feeder on a 415 V supply with a high fault-current transformer, this breaker handles the full available fault without cascading to a main breaker. ## Thermal derating — the real continuous current at panel ambient At 55 °C it derates to 385 A, at 60 °C to 370 A, at 65 °C to 355 A, and at 70 °C to 340 A. For a panel running at 55 °C ambient — common in sealed enclosures with solar load — the breaker still carries 385 A, not the full 400 A. The maximum power loss is 96 W, which factors into enclosure thermal calculations. ## Mounting dimensions and panel fit Dimensions: 248 mm high, 184 mm wide, 110 mm deep. The 184 mm width is the 4-pole frame — standard for a 400 A MCCB in this class. ## What this breaker does not include The ETU350 release handles overcurrent protection only — line protection version. If the application requires remote tripping or ground fault, this is not the variant. The auxiliary contact set (1 NO/NC + 1 trip alarm) is present and wired to the HQ terminals.","metaTitle":"Siemens 3VA2340-5HN42-0AF0 SENTRON MCCB, 400 A, 4-Pole, 187","metaDescription":"Siemens SENTRON 3VA2340-5HN42-0AF0 molded case circuit breaker, 400 A rated, 4-pole, 187 kA at 240 V. Current lifecycle. Sourced to order against RFQ.","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":"121 kA","at 500 V":"75.6 kA","at 690 V":"17 kA","at 40 °C":"400 A","at 45 °C":"400 A","at 50 °C":"400 A","at 55 °C":"385 A","at 60 °C":"370 A","at 65 °C":"355 A","at 70 °C":"340 A","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":"15 000","Undervoltage Release":"No","Communication Function":"No","Phase failure detection":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","Power loss [W] / maximum":"96 W","Auxiliary contact version":"1 auxiliary switch + 1 trip alarm switch HQ","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Rated continuous current Iu":"400 A","Rated insulation voltage Ui":"800 V","Of The Supplied Basic Switch":"3VA2340-5HN42-0AA0","Design of the auxiliary release":"Without auxiliary release","Ground fault monitoring version":"Without","Of The Integrated Auxiliary Trip":"3VA9608-0BB11","Design of the overcurrent release":"ETU350","Protection class IP / on the front":"IP40","Reference code / acc. to DIN EN 81346-2":"Q","Adjustable response value time / tr max.":"17","Adjustable response value time / tr min.":"0.5","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.":"4 000 A","Adjustable response value current / lr min.":"160 A","Adjustable response value current / Isd max.":"0 A","Adjustable response value current / Isd min.":"0 A","Neutral conductors / upgradeable/retrofittable":"No","Number of CO contacts / for auxiliary contacts":"2","Protective function of the overcurrent release":"LSI","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AB12","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=112683&mlfb=3VA2340-5HN42-0AF0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2340-5HN42-0AF0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA2340-5HN42-0AF0 and what is the lead time?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or lead-time number is published here."},{"question":"What is the interrupting capacity at 415 V?","answer":"121 kA at 415 V. At 240 V it is 187 kA, at 440 V it is also 121 kA, at 500 V it is 75.6 kA, and at 690 V it is 17 kA."},{"question":"What are the physical dimensions — depth, width, height?","answer":"Depth 110 mm, width 184 mm, height 248 mm. The 184 mm width is the 4-pole frame size."},{"question":"Does 3VA2340-5HN42-0AF0 include auxiliary contacts?","answer":"Yes, it ships with one auxiliary switch plus one trip alarm switch (HQ version) — the kit is complete for status feedback without a separate order."},{"question":"What trip unit does this MCCB use?","answer":"The ETU350 electronic overcurrent release. It is a fixed trip unit — not field-swappable — so verify the trip curve matches your coordination study before ordering."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2340-5HN42-0AF0","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/3VA2340-5HN42-0AF0 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}}