{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-4EF42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-4EF42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-4EF42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-4EF42-0AA0, molded case circuit breaker, 4-pole, 20 A, TM240 overcurrent release, interrupting capacity 121 kA at 240 VAC.","salesMarkdown":"## MCCB for line protection with TM240 release The 3VA1120-4EF42-0AA0: Rated 20 A continuous at 40 °C through 55 °C, derating to 19 A at 60 °C and above — the full thermal curve is published, so no guesswork when the panel ambient runs hot. Interrupting capacity is 121 kA at 240 VAC, dropping to 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 500/690 V. Insulation voltage rated 800 V, IP40 protection on the front face — suitable for enclosure mounting where the front is behind a panel door. The 4-pole width (101.6 mm) is standard for a 4-pole MCCB in the 3VA frame — verify DIN-rail or screw-mount clearance in your enclosure. Maximum power loss is 12 W — account for that in your thermal budget if the breaker is tightly grouped in a multi-unit panel.","metaTitle":"Siemens SENTRON 3VA1120-4EF42-0AA0 MCCB, 4-Pole, 20 A, 121 k","metaDescription":"Siemens SENTRON 3VA1120-4EF42-0AA0 molded case circuit breaker, 4-pole, 20 A rated, TM240 release. Interrupting capacity 121 kA at 240 VAC. Active production, sourced to order. Req","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","Maximum":"0 A","Minimum":"0 A","at 240 V":"121 kA","at 415 V":"75.6 kA","at 440 V":"52.5 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","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":"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","Ground-Fault Monitoring Version":"Without","Insulation Voltage / Rated Value":"800 V","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","Product Function / Grounding Protection":"No","operating voltage / at AC / rated value":"690 V","operating voltage / at DC / rated value":"600 V","reference code / according to IEC 81346-2":"Q","Product Extension / Optional / Motor Drive":"Yes","Protection Function Of The Overcurrent Release":"LI","number of CO contacts / for auxiliary contacts":"0","Switching Capacity Class Of The Circuit Breaker":"S","Mechanical Service Life (Operating Cycles) / Typical":"20 000","Type Of Electrical Connection / For Main Current Circuit":"nut keeper kit on both ends","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/20735f7e423b922a6a335b326f9f4edd.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=54282&mlfb=3VA1120-4EF42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3VA1120-4EF42-0AA0?","answer":"Submit an RFQ through our desk. Pricing and stock are confirmed at quote time through our independent distribution channel; we do not publish live prices or counts on the page."},{"question":"What is the interrupting capacity of 3VA1120-4EF42-0AA0 at 240 V?","answer":"121 kA at 240 VAC. It also carries 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 500/690 V."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-4EF42-0AA0","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/3VA1120-4EF42-0AA0 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}}