{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2040-8KP42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2040-8KP42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2040-8KP42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2040-8KP42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"SENTRON 3VA2040-8KP42-0AA0, molded case circuit breaker, 4-pole, 40 A continuous, ETU850 electronic trip unit, line protection, IP40 front.","salesMarkdown":"The SENTRON 3VA2040-8KP42-0AA0 is a 4-pole molded case circuit breaker rated 40 A continuous at 40 °C, and it holds that rating flat through 70 °C — no derate curve to chase. Breaking capacity hits 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V — numbers that cover most industrial distribution panels without a series-rating dance. It's built around the ETU850 electronic trip unit, which gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves — not a thermal-magnetic fixed curve. ## Panel fit and footprint Front face carries IP40 protection, meaning it's sealed against tools and wires over 1 mm but not washdown — keep it inside the enclosure, not on the panel door. ## Communication and monitoring This breaker includes a communication function and an 'other measurement function' — the ETU850 supports Modbus RTU via the SENTRON communication module, giving you load current, power, and energy data back to the PLC or BMS without a separate power meter. ## Sourcing posture Active lifecycle, standard catalog item.","metaTitle":"SENTRON 3VA2040-8KP42-0AA0 MCCB, 40 A, 4-Pole, ETU850","metaDescription":"SENTRON 3VA2040-8KP42-0AA0 molded case circuit breaker, 40 A continuous, 4-pole, ETU850 trip unit, 440 kA at 240 V. Active production. Quoted to order.","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","Trip Indicator":"No","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":"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":"Without","Continuous Current / Rated Value":"40 A","Insulation Voltage / Rated Value":"800 V","Design Of The Overcurrent Release":"ETU850","protection class IP / on the front":"IP40","design of the N-conductor protection":"adjustable OFF; 40% to 160%","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":"100 A","Product Extension / Optional / Motor Drive":"Yes","Protection Function Of The Overcurrent Release":"LSI","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=355911&mlfb=3VA2040-8KP42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2040-8KP42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of this MCCB at 480 V?","answer":"At 500 V it is rated 220 kA; at 440 V it is 330 kA. For a 480 V system, the 440 V rating (330 kA) is the applicable bound — conservative for most distribution panels."},{"question":"Does this breaker need a separate ground-fault module?","answer":"This variant ships without ground-fault monitoring (version 'Without'), but the ETU850 trip unit itself supports ground-fault protection when paired with the correct sensor — verify the sensor configuration on your BOM."},{"question":"Where can I buy 3VA2040-8KP42-0AA0?","answer":"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 position."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2040-8KP42-0AA0","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/3VA2040-8KP42-0AA0 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}}