{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2340-5JQ42-0AF0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2340-5JQ42-0AF0","canonicalUrl":"https://aoctrl.com/siemens/3VA2340-5JQ42-0AF0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2340-5JQ42-0AF0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2340-5JQ42-0AF0, molded case circuit breaker, 4-pole, 400 A rated, 187 kA interrupting capacity at 240 V AC, line protection design with communication function.","salesMarkdown":"It's a 4-pole unit designed to sit in a distribution panel or switchboard — the 248 mm height, 184 mm width, and 110 mm depth (9.76 x 7.24 x 4.33 in) tell you the cubicle cutout and busbar spacing needed. The interrupting ratings are what decide whether it clears a fault without upstream damage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V. At 690 V the capacity drops sharply — that's the voltage class where the arc energy saturates the internal arc chamber; if your system runs 690 V with available fault current above 7.5 kA, this breaker isn't the right fit. Above that, it steps down: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. Maximum power loss is 96 W, which adds to the enclosure's thermal load. The 3VA2340-5JQ42-0AF0 carries a communication function, which means it can integrate with monitoring systems — useful for a plant that tracks breaker status or load profiles. ## Installation and integration notes Mounts in a standard switchboard or distribution panel — the 184 mm width and 248 mm height fit common MCCB cubicle cutouts. The 110 mm depth leaves room for rear bus connections and wiring ducts. It's a 4-pole breaker, so it needs four conductors plus a neutral if the system requires it. The basic switch variant is listed as 3VA2340-5JQ42-0AA0, which is the same frame without the communication module; this version adds the comms function on top of the base switch. No undervoltage release is fitted, and no voltage trigger — if you need undervoltage protection, you'd add an external release module.","metaTitle":"Siemens 3VA2340-5JQ42-0AF0 SENTRON MCCB, 400 A, 4-Pole, 187","metaDescription":"Siemens 3VA2340-5JQ42-0AF0 SENTRON molded case circuit breaker, 400 A rated, 4-pole, 187 kA interrupting at 240 V. Active production, sourced to order. Quoted 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":"600 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":"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","Initial Value":"80 A","Trip Indicator":"Yes","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":"No","Of The Supplied Basic Switch":"3VA2340-5JQ42-0AA0","Design Of The Auxiliary Switch":"1 auxiliary switch + 1 trip alarm switch HQ","Design Of The Auxiliary Release":"Without auxiliary release","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":"ETU560","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":"2","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=157435&mlfb=3VA2340-5JQ42-0AF0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2340-5JQ42-0AF0/alternatives.json"},"ai":{"faq":[{"question":"What is the interrupting capacity of this MCCB at different voltages?","answer":"The interrupting rating is 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V. At 690 V the capacity drops significantly, so verify your available fault current at that voltage."},{"question":"What are the physical dimensions of 3VA2340-5JQ42-0AF0?","answer":"Height is 248 mm (9.76 in), width is 184 mm (7.24 in), and depth is 110 mm (4.33 in). These dimensions determine the panel cutout and busbar spacing required."},{"question":"Where can I buy 3VA2340-5JQ42-0AF0 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm quote."},{"question":"Does this breaker require derating at high ambient temperatures?","answer":"It holds 400 A from 40 °C to 50 °C. Above that, it derates to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If your panel runs hot, factor in the derated current."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2340-5JQ42-0AF0","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/3VA2340-5JQ42-0AF0 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}}