{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2140-5KQ42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2140-5KQ42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2140-5KQ42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2140-5KQ42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2 molded case circuit breaker, 3VA2140-5KQ42-0AA0, 40 A, 4-pole, ETU860 electronic trip unit, line protection, 121 kA at 415 V.","salesMarkdown":"## What this 40 A SENTRON MCCB delivers The Siemens 3VA2140-5KQ42-0AA0 is a 4-pole molded case circuit breaker from the SENTRON 3VA2 series, rated at 40 A continuous current (Iu) across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. Breaking capacity hits 121 kA at 415 V and 440 V, and 187 kA at 240 V, so it handles high-fault utility feeds and transformer secondaries without cascading upstream. This is a line-protection device — it guards distribution feeders and large branch circuits, not motor starters. The communication function lets it talk to a higher-level monitoring system for power-quality data and trip-event logging, which is useful if you're tracking arc-flash incident energy or doing selective coordination studies. The optional motor drive lets you remote-trip or remote-reset the breaker for unattended restart schemes.","metaTitle":"Siemens 3VA2140-5KQ42-0AA0 SENTRON MCCB, 40 A, 4-Pole, 121 k","metaDescription":"Siemens 3VA2140-5KQ42-0AA0 SENTRON molded case circuit breaker, 40 A, 4-pole, ETU860 release. 121 kA at 415 V. Current lifecycle, sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"86 mm","Width":"140 mm","Height":"181 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":"3.7 kA","at 40 °C":"40 A","at 45 °C":"40 A","at 50 °C":"40 A","at 55 °C":"40 A","at 60 °C":"40 A","at 65 °C":"40 A","at 70 °C":"40 A","Depth [In]":"3.39 in","Width [In]":"5.51 in","Height [In]":"7.13 in","Trip Indicator":"No","Number Of Poles":"4","Product version":"Line protection","Voltage Trigger":"No","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Molded case circuit breaker","Undervoltage Release":"No","Communication Function":"Yes","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"1.6 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"Yes","Courant permanent assigné Iu":"40 A","Ground-Fault Monitoring Version":"Summation current formation L + N conductor","Tension assignée d'isolement Ui":"800 V","Design Of The Overcurrent Release":"ETU860","protection class IP / on the front":"IP40","reference code / acc. to IEC 81346-2":"Q","Product Extension / Optional / Motor Drive":"Yes","Adjustable response value current / lg max.":"40 A","Adjustable response value current / lg min.":"16 A","Adjustable response value current / li max.":"480 A","Adjustable response value current / li min.":"60 A","Neutral conductors / upgradeable/retrofittable":"No","Protection Function Of The Overcurrent Release":"LSIG","number of CO contacts / for auxiliary contacts":"0","Switching Capacity Class Of The Circuit Breaker":"M","Max. rated operational current of the frame size":"160 A","Mechanical Service Life (Operating Cycles) / Typical":"25 000","Type Of Electrical Connection / For Main Current Circuit":"on both sides nut keeper kit","Arrangement Of Electrical Connectors / For Main Current Circuit":"Front terminal","Type of connectable conductor cross-section, connection screw, width x thickness , min.":"13 x 1 mm"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/cda978e31ec81fb539d5632cb59bd0b3.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=453074&mlfb=3VA2140-5KQ42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2140-5KQ42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3VA2140-5KQ42-0AA0 and get a price?","answer":"We source and quote this part to order against an RFQ. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm quote."},{"question":"What are the key ratings for the 3VA2140-5KQ42-0AA0?","answer":"It is a 40 A continuous rated, 4-pole MCCB with an ETU860 electronic trip unit. Breaking capacity is 121 kA at 415 V and 440 V, 187 kA at 240 V, 75.6 kA at 500 V, and 3.7 kA at 690 V (–). Insulation voltage is 800 V."},{"question":"What is the depth of the 3VA2140-5KQ42-0AA0?","answer":"The depth is 86 mm."},{"question":"What is the width of the 3VA2140-5KQ42-0AA0?","answer":"The width is 140 mm."},{"question":"Will the 3VA2140-5KQ42-0AA0 drop into a panel specified for the 3VA2140-8JQ42-0AA0?","answer":"Both are 4-pole 3VA2 frame breakers with the same mounting footprint — same height, width, and depth class. The difference is the trip unit: the -5KQ42-0AA0 carries the ETU860 electronic release with ground-fault summation monitoring, while the -8JQ42-0AA0 uses a different release variant. Panel cutouts and bus-bar spacing are identical; the swap is mechanical but check the trip-unit coordination study before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2140-5KQ42-0AA0","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/3VA2140-5KQ42-0AA0 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}}