{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-4EF36-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-4EF36-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-4EF36-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF36-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-4EF36-0AA0, 3-pole molded case circuit breaker, 20 A rated current, 121 kA breaking capacity at 240 V AC, TM240 thermal-magnetic release, line protection design.","salesMarkdown":"It carries a 20 A continuous current at 40 °C ambient — no derating needed up to 55 °C where it still holds 20 A, then drops to 19 A at 60 °C through 70 °C. That thermal curve makes it a straight pick for a panel running warm but not hot; no need to oversize for a 50 °C enclosure interior. Breaking capacity hits 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 500 V or 690 V. That 121 kA figure at 240 V means it handles high-fault utility feeds without cascading upstream — common in North American 240/120 V split-phase service entrances or large 240 V motor control centers. ## TM240 release and protection design The overcurrent release is the TM240 thermal-magnetic type — fixed thermal pickup with magnetic short-circuit trip. This is a plain-vanilla line protection breaker: no accessories inside the frame, so what you see on the nameplate is what the BOM gets. Insulation voltage rated at 800 V, which covers 690 V systems with margin. IP40 on the front means dry indoor panels only; no washdown. Max power loss 12 W — negligible heat contribution in a ventilated enclosure.","metaTitle":"Siemens 3VA1120-4EF36-0AA0 SENTRON MCCB, 3-pole 20 A, 121 kA","metaDescription":"Siemens SENTRON 3VA1120-4EF36-0AA0 molded case circuit breaker, 3-pole, 20 A rated at 40 °C, 121 kA breaking capacity at 240 V. TM240 release, line protection, IP40 front. Active p","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"70 mm","Width":"76.2 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]":"3 in","Height [In]":"5.12 in","Trip Indicator":"No","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":"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","Product Function / Grounding Protection":"No","operating voltage / at AC / rated value":"690 V","operating voltage / at DC / rated value":"500 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":"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/0d57fbfa5ce2bc8592bf92b9c945ba98.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=453689&mlfb=3VA1120-4EF36-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF36-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3VA1120-4EF36-0AA0 at 240 V?","answer":"121 kA at 240 V AC, which covers high-fault utility feeds. At 415 V it breaks 75.6 kA, at 440 V it breaks 52.5 kA, and at 500 V or 690 V it breaks 11.9 kA."},{"question":"Will 3VA1120-4EF36-0AA0 drop into a panel specified for 3VA1110-5ED36-0AA0?","answer":"Both are 3-pole SENTRON 3VA MCCBs in the same frame size — same height (130 mm), width (76.2 mm), and depth (70 mm) — so the physical footprint is identical. The 3VA1120-4EF36-0AA0 carries a 20 A TM240 release versus the 3VA1110-5ED36-0AA0's lower rating, so verify the breaker sizing matches the circuit load before swapping."},{"question":"Where can I buy 3VA1120-4EF36-0AA0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial response."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-4EF36-0AA0","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/3VA1120-4EF36-0AA0 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}}