{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2340-5HN42-0AH0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2340-5HN42-0AH0","canonicalUrl":"https://aoctrl.com/siemens/3VA2340-5HN42-0AH0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2340-5HN42-0AH0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2340-5HN42-0AH0, molded case circuit breaker, 4-pole, 400 A rated continuous current, 187 kA interrupting capacity at 240 V AC, line protection design.","salesMarkdown":"## 400 A MCCB with 187 kA interrupting capacity — SENTRON 3VA2 platform The Siemens 3VA2340-5HN42-0AH0 is a 4-pole molded case circuit breaker from the SENTRON 3VA2 series, rated for 400 A continuous current at 40 °C ambient. Its interrupting capacity reaches 187 kA at 240 V AC, 121 kA at 415 V, and 75.6 kA at 500 V — figures that place it squarely in high-fault-duty distribution, not branch-circuit protection. The 96 W maximum power loss is a panel-cooling consideration: at full load the heat dissipation is comparable to a small drive, so ventilation slots or forced airflow in a sealed enclosure should be factored in. ## Selectivity and coordination — what the interrupting ratings mean for your distribution For a site electrical engineer building a selective coordination study, these numbers tell you the 3VA2340-5HN42-0AH0 can be placed upstream of lower-rated branch breakers without cascading failure — provided the let-through energy curves are verified. The 400 A continuous rating holds steady through 50 °C, then derates to 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C — a 15 % reduction at the top end. Panel builders should size the enclosure and buswork for the full 400 A at the expected ambient, not the derated value.","metaTitle":"Siemens 3VA2340-5HN42-0AH0 SENTRON MCCB, 400 A, 4-Pole, 187","metaDescription":"Siemens SENTRON 3VA2340-5HN42-0AH0 molded case circuit breaker, 400 A continuous, 4-pole, 187 kA interrupting at 240 V. Active production. 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","Maximum":"4 000 A","Minimum":"4 000 A","at 240 V":"187 kA","at 415 V":"121 kA","at 440 V":"121 kA","at 500 V":"75.6 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":"385 A","at 60 °C":"370 A","at 65 °C":"355 A","at 70 °C":"340 A","Depth [In]":"4.33 in","Width [In]":"7.24 in","Height [In]":"9.76 in","Trip Indicator":"Yes","Number Of Poles":"4","Voltage Trigger":"No","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Molded case circuit breaker","Undervoltage Release":"No","Design Of The Product":"Line protection","Communication Function":"No","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":"No","Of The Supplied Basic Switch":"3VA2340-5HN42-0AA0","Design Of The Auxiliary Switch":"2 auxiliary switches + 1 trip alarm switch HQ","Design Of The Auxiliary Release":"Without auxiliary release","Ground-Fault Monitoring Version":"Without","Continuous Current / Rated Value":"400 A","Insulation Voltage / Rated Value":"800 V","Design Of The Overcurrent Release":"ETU350","protection class IP / on the front":"IP40","design of the N-conductor protection":"adjustable OFF; 50%; 100%","Product Function / Grounding Protection":"No","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":"LSI","number of CO contacts / for auxiliary contacts":"3","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AB12","Switching Capacity Class Of The Circuit Breaker":"M","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,"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=36956&mlfb=3VA2340-5HN42-0AH0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2340-5HN42-0AH0/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3VA2340-5HN42-0AH0?","answer":"Pricing and stock are confirmed at quote time against an RFQ. Submit a request through the storefront; availability and current pricing are provided on a per-order basis."},{"question":"What are the key interrupting ratings for this MCCB?","answer":"187 kA at 240 V AC, 121 kA at 415 V AC and at 440 V AC, 75.6 kA at 500 V AC, and 7.5 kA at 690 V AC. The 690 V figure is notably lower — verify system voltage before specifying."},{"question":"Does this breaker include an undervoltage release or ground-fault monitoring?","answer":"No. This order code ships without undervoltage release and without ground-fault monitoring. It is a straight line-protection breaker with 2 auxiliary switches plus 1 trip alarm switch HQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2340-5HN42-0AH0","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/3VA2340-5HN42-0AH0 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}}