{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-5EF42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-5EF42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-5EF42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-5EF42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-5EF42-0AA0, 4-pole molded case circuit breaker, 20 A rated, TM240 thermal-magnetic release, 187 kA IC at 240 V AC, line protection design.","salesMarkdown":"It carries a TM240 thermal-magnetic release, meaning the thermal element handles overloads and the magnetic element clears short-circuits, no electronic trip unit, no communication, no ground-fault monitoring. At 240 V AC the interrupting capacity hits 187 kA; at 415 V it's 121 kA, at 440 V it's 75.6 kA, and at 500/690 V it holds at 17 kA. ## Thermal rating and what it means for the panel Rated current is 20 A and it holds that rating from 40 °C through 55 °C ambient without derating. At 60 °C it drops to 19 A, and it stays at 19 A through 70 °C. Above that you lose 1 A. The power loss at rated load is 12 W, which is modest for a 4-pole MCCB and won't drive a significant temperature rise inside a well-ventilated panel. The 101.6 mm (4-inch) width for a 4-pole breaker is standard for the SENTRON 3VA frame size — it occupies the same footprint as other 4-pole 3VA breakers in the same current range, so a panel laid out for a 3VA125 or 3VA111 will accept this unit without re-drilling the mounting plate.","metaTitle":"Siemens 3VA1120-5EF42-0AA0 SENTRON MCCB, 4P, 20A, 187kA at 2","metaDescription":"Siemens SENTRON 3VA1120-5EF42-0AA0 molded case circuit breaker, 4-pole, 20 A rated, 187 kA breaking capacity at 240 V AC. TM240 release, line protection. Quoted to order against RF","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":"187 kA","at 415 V":"121 kA","at 440 V":"75.6 kA","at 500 V":"17 kA","at 690 V":"17 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":"M","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=491945&mlfb=3VA1120-5EF42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-5EF42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA1120-5EF42-0AA0 and get a price?","answer":"This part is 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 price and lead time."},{"question":"What is the breaking capacity of 3VA1120-5EF42-0AA0 at different voltages?","answer":"At 240 V AC the interrupting capacity is 187 kA. At 415 V it's 121 kA, at 440 V it's 75.6 kA, and at both 500 V and 690 V it's 17 kA."},{"question":"What is the rated current of 3VA1120-5EF42-0AA0 and does it derate with temperature?","answer":"Rated current is 20 A. It holds 20 A from 40 °C through 55 °C ambient. At 60 °C it derates to 19 A, and stays at 19 A through 70 °C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-5EF42-0AA0","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/3VA1120-5EF42-0AA0 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}}