{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-3EF42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-3EF42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-3EF42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-3EF42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-3EF42-0AA0, Molded case circuit breaker, 4-pole, 20 A at 40 °C, TM240 release, breaking capacity 75.6 kA at 240 V AC.","salesMarkdown":"The Siemens SENTRON 3VA1120-3EF42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated 20 A continuous at 40 °C, with the TM240 thermal-magnetic release providing fixed overload and short-circuit protection. At 415 V the rating drops to 52.5 kA, and at 690 V to 11.9 kA, so verify the available fault current at your service voltage before committing the BOM line. The IP40 protection on the front means the breaker face is sealed against tools and small solids but not against moisture — suitable for a dry indoor panel. ## Physical fit and integration The 4-pole body occupies the same DIN-rail footprint as other SENTRON 3VA breakers of this frame size. If your BOM calls for a shunt trip or aux contact, order the accessory separately.","metaTitle":"Siemens 3VA1120-3EF42-0AA0 SENTRON MCCB, 20 A, 4-Pole, 75.6","metaDescription":"Siemens SENTRON 3VA1120-3EF42-0AA0 molded case circuit breaker. 20 A rated at 40 °C, 4-pole, TM240 release. Breaking capacity 75.6 kA at 240 V. Active production. Quoted to order a","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"70 mm","Width":"101.6 mm","Height":"130 mm","at 240 V":"75.6 kA","at 415 V":"52.5 kA","at 440 V":"32 kA","at 500 V":"11.9 kA","at 690 V":"11.9 kA","at 40 °C":"20 A","at 45 °C":"20 A","at 50 °C":"20 A","at 55 °C":"20 A","at 60 °C":"19 A","at 65 °C":"19 A","at 70 °C":"19 A","Depth [In]":"2.76 in","Width [In]":"4 in","Height [In]":"5.12 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":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"12 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","rated insulation voltage Ui":"800 V","Ground-Fault Monitoring Version":"Without","Design Of The Overcurrent Release":"TM240","Design Of Short-Circuit Protection":"For switching power values in DC networks, see the 3VA molded case circuit breaker device manual; link to be found under Service & Support in the last chapter","protection class IP / on the front":"IP40","design of the N-conductor protection":"without","operating voltage / at AC / rated value":"690 V","Max. rated operational voltage Ue with DC":"600 V","reference code / according to IEC 81346-2":"Q","Product Extension / Optional / Motor Drive":"Yes","Neutral conductors / upgradeable/retrofittable":"No","Protection Function Of The Overcurrent Release":"LI","number of CO contacts / for auxiliary contacts":"0","Switching Capacity Class Of The Circuit Breaker":"N","Mechanical Service Life (Switching Cycles) / Typical":"20 000","reference value setting current (Ii) / for I-tripping":"x In","Type Of Electrical Connection / For Main Current Circuit":"nut keeper kit on both ends","type of value list setting current (Ii) / for I-tripping":"St","Arrangement Of Electrical Connectors / For Main Current Circuit":"Front terminal","Type of connectable conductor cross-section, connection screw, width x thickness , max.":"17 x 6,5 mm","Type of connectable conductor cross-section, connection screw, width x thickness , min.":"12 x 1 mm"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a49dfa0a48972130d0ed9a83b1387b57.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=418997&mlfb=3VA1120-3EF42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-3EF42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA1120-3EF42-0AA0 and how is it quoted?","answer":"The part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock figures or prices are published here."},{"question":"What is the breaking capacity of 3VA1120-3EF42-0AA0 at different voltages?","answer":"At 240 V it is 75.6 kA; at 415 V it is 52.5 kA; at 440 V it is 32 kA; at 500 V and 690 V it is 11.9 kA. The rating steps down as voltage rises — always confirm against the available fault current at your service voltage."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-3EF42-0AA0","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/3VA1120-3EF42-0AA0 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}}