{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2040-8KQ42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2040-8KQ42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2040-8KQ42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2040-8KQ42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON molded case circuit breaker, 3VA2040-8KQ42-0AA0, 40 A, 4-pole, line protection design, 440 kA interrupting at 240 V.","salesMarkdown":"## 40 A, 4-pole SENTRON MCCB — line protection with communication The Siemens SENTRON 3VA2040-8KQ42-0AA0 is a 4-pole molded case circuit breaker rated for 40 A continuous current, designed specifically for line protection in distribution panels. It carries a 440 kA interrupting capacity at 240 V, stepping down to 330 kA at 415/440 V and 220 kA at 500 V, with 52.5 kA at 690 V — giving you selectivity headroom across common low-voltage distribution voltages. The breaker includes an onboard communication function and summation ground-fault monitoring (L+N conductor), so it fits into monitored distribution schemes without an external module. ## SCCR and thermal performance across the panel temperature band Rated continuous current holds flat at 40 A from 40 °C through 70 °C ambient — no derating needed within that window, which simplifies panel thermal budgeting. The 4-pole footprint measures 140 mm wide by 181 mm tall by 86 mm deep, fitting standard Siemens SENTRON mounting patterns. Insulation voltage is rated 800 V, so the breaker is comfortable in 480/277 V and 600 V nominal systems with margin.","metaTitle":"Siemens 3VA2040-8KQ42-0AA0 SENTRON MCCB, 40 A, 4-Pole, 440 k","metaDescription":"Siemens SENTRON 3VA2040-8KQ42-0AA0 molded case circuit breaker, 40 A continuous, 4-pole, line protection. 440 kA SCCR at 240 V. Active production, quoted to order. Request quote.","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","Maximum":"480 A","Minimum":"60 A","at 240 V":"440 kA","at 415 V":"330 kA","at 440 V":"330 kA","at 500 V":"220 kA","at 690 V":"52.5 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","Initial Value":"16 A","Trip Indicator":"No","Number Of Poles":"4","Voltage Trigger":"No","lifecycle_stage":"current","Full-Scale Value":"40 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":"1.2 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"Yes","Ground-Fault Monitoring Version":"Summation current formation L + N conductor","Continuous Current / Rated Value":"40 A","Insulation Voltage / Rated Value":"800 V","Design Of The Overcurrent Release":"ETU860","protection class IP / on the front":"IP40","design of the N-conductor protection":"adjustable OFF; 40% to 160%","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":"100 A","Product Extension / Optional / Motor Drive":"Yes","Protection Function Of The Overcurrent Release":"LSIG","number of CO contacts / for auxiliary contacts":"0","Switching Capacity Class Of The Circuit Breaker":"L","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"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/fe959adbd11e71c03f52ddad9a178781.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=145956&mlfb=3VA2040-8KQ42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2040-8KQ42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the interrupting capacity of 3VA2040-8KQ42-0AA0 at 240 V?","answer":"440 kA at 240 V, stepping to 330 kA at 415/440 V, 220 kA at 500 V, and 52.5 kA at 690 V."},{"question":"Where can I buy 3VA2040-8KQ42-0AA0 and how is it quoted?","answer":"Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time."},{"question":"Does 3VA2040-8KQ42-0AA0 include ground-fault monitoring?","answer":"Yes, it has summation current ground-fault monitoring on the L+N conductor."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2040-8KQ42-0AA0","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/3VA2040-8KQ42-0AA0 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}}