{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-3EF46-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-3EF46-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-3EF46-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-3EF46-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-3EF46-0AA0, 4-pole molded case circuit breaker, 20 A rated current, TM240 thermal-magnetic release, breaking capacity 75.6 kA at 240 V AC.","salesMarkdown":"No undervoltage release or communication function is built in, so it's a straight electromechanical protector with no auxiliary electronics to fail. Breaking capacity is 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. ## Panel fit and thermal derating The 4-pole width at roughly 100 mm is standard for a 4-pole MCCB in a DIN-rail or backplate layout — plan for that footprint when laying out gland plates and busbar runs. Rated 20 A continuously at 40 °C, and holds that rating through 55 °C. At 60 °C it derates to 19 A, and stays at 19 A through 70 °C. That gives a solid thermal margin in a warm enclosure; you don't lose headroom until the ambient exceeds 55 °C. Front IP40 protection means it's sealed against tools and small wires but not against water spray — keep it inside the panel, not on a washdown-zone door. Insulation voltage rated at 800 V, power loss 12 W max. These are standard industrial specs — no special handling or climate-controlled storage needed.","metaTitle":"Siemens 3VA1120-3EF46-0AA0 SENTRON MCCB, 20 A, 4-Pole, 75.6","metaDescription":"Siemens SENTRON 3VA1120-3EF46-0AA0 molded case circuit breaker, 20 A rated, 4-pole, breaking capacity 75.6 kA at 240 V. TM240 release. 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":"70 mm","Width":"101.6 mm","Height":"130 mm","Maximum":"0 A","Minimum":"0 A","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","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":"N","Mechanical Service Life (Operating Cycles) / Typical":"20 000","Type Of Electrical Connection / For Main Current Circuit":"box terminal on both sides","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/2de6621005642f8ba51d60b1cad42d44.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=376103&mlfb=3VA1120-3EF46-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-3EF46-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of this MCCB at 240 V?","answer":"75.6 kA at 240 V AC. That's the highest interrupting rating on this breaker, suitable for high-fault-current services near transformers."},{"question":"Where can I buy 3VA1120-3EF46-0AA0 and how is it quoted?","answer":"This part is sourced through independent distribution channels and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What does the TM240 release designation mean?","answer":"TM240 indicates a thermal-magnetic overcurrent release with a 20 A continuous current rating at 40 °C ambient. The thermal element protects against overloads; the magnetic element trips instantaneously on short-circuit currents."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-3EF46-0AA0","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/3VA1120-3EF46-0AA0 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}}