{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA4120-5ED34-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA4120-5ED34-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA4120-5ED34-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA4120-5ED34-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA4120-5ED34-0AA0, molded-case circuit breaker, 3-pole, 20 A rated, 85 kA at 240 VAC, TM210 thermal-magnetic trip unit, system protection design.","salesMarkdown":"The Siemens 3VA4120-5ED34-0AA0 is a 3-pole SENTRON molded-case circuit breaker (MCCB) rated 20 A continuous at 40 °C, with a TM210 thermal-magnetic trip unit — fixed thermal, fixed magnetic — designed for system protection in distribution panels. Interrupting capacity hits 85 kA at 240 VAC, 35 kA at 480 VAC, and 18 kA at 600Y/347 VAC — numbers that tell you this breaker handles high available fault current on the secondary side of a large transformer without needing a current-limiting fuse upstream. ## Thermal derating — the real-world current you can run At 50 °C it derates to 19 A, at 60 °C to 18 A, and at 70 °C to 17 A. Dimensions are 76.2 mm wide, 129.4 mm tall, 75.1 mm deep — a standard 3-pole MCCB footprint that drops into most SENTRON or third-party distribution panels without re-drilling the mounting plate.","metaTitle":"Siemens 3VA4120-5ED34-0AA0 SENTRON MCCB, 20 A, 85 kA at 240","metaDescription":"Siemens 3VA4120-5ED34-0AA0 SENTRON molded-case circuit breaker, 3-pole, 20 A rated, 85 kA interrupting at 240 VAC. TM210 trip unit. Current 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":"75.1 mm","Width":"76.2 mm","Height":"129.4 mm","Maximum":"1 s","Minimum":"1 s","at 240 V":"85 kA","at 480 V":"35 kA","at 40 °C":"20 A","at 45 °C":"20 A","at 50 °C":"19 A","at 55 °C":"19 A","at 60 °C":"18 A","at 65 °C":"18 A","at 70 °C":"17 A","Depth [In]":"2.96 in","Width [In]":"3 in","Height [In]":"5.09 in","Trip Indicator":"No","at 480 Y/277 V":"35 kA","at 600 Y/347 V":"18 kA","Number Of Poles":"3","Voltage Trigger":"No","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Molded-case circuit breaker","Undervoltage Release":"No","Design Of The Product":"System protection","Communication Function":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"8.5 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Ground-Fault Monitoring Version":"Without","Design Of The Overcurrent Release":"TM210","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","Product Function / Grounding Protection":"No","operating voltage / at AC / rated value":"690 V","Product Extension / Optional / Motor Drive":"No","product designation / according to UL file":"MEAB","Protection Function Of The Overcurrent Release":"LI","number of CO contacts / for auxiliary contacts":"0","Switching Capacity Class Of The Circuit Breaker":"M","electrical endurance (operating cycles) / at 480 V":"8 000","electrical endurance (operating cycles) / at 600 V":"4 000","marking / according to UL 489 / 100%-rated breaker":"No","Mechanical Service Life (Operating Cycles) / Typical":"15 000","Type Of Electrical Connection / For Main Current Circuit":"Infeed side: Low tab","Arrangement Of Electrical Connectors / For Main Current Circuit":"output side: circular conductor connection"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d69e6b3b8396dc515f9b0ae09010e21c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1058150&mlfb=3VA4120-5ED34-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA4120-5ED34-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the interrupting capacity of this MCCB?","answer":"85 kA at 240 VAC, 35 kA at 480 VAC, and 18 kA at 600Y/347 VAC — sufficient for most secondary-side distribution applications."},{"question":"Where can I buy 3VA4120-5ED34-0AA0 and how is it quoted?","answer":"It is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA4120-5ED34-0AA0","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/3VA4120-5ED34-0AA0 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}}