{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-4EF36-0AF0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-4EF36-0AF0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-4EF36-0AF0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF36-0AF0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-4EF36-0AF0, 3-pole molded case circuit breaker, 20 A (40 °C), 121 kA interrupting at 240 V, TM240 thermal-magnetic release, line protection design.","salesMarkdown":"## What this MCCB does on the line Continuous current rating holds at 20 A from 40 °C through 55 °C ambient, then derates to 19 A at 60 °C and 65 °C — useful if the breaker lives in a warm enclosure or next to other heat sources. Interrupting capacity reaches 121 kA at 240 V, dropping to 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 500 V and 690 V — the 121 kA figure at 240 V means it can clear a high-fault utility transformer secondary without upstream fuses, but at 480/500 V systems the available fault current must stay under 11.9 kA. ## Thermal-magnetic release and internal configuration Trip indicator present on the front face — a visual flag or window shows whether the breaker tripped on fault versus being manually switched off, which speeds fault isolation on a panel walk-down. If you need UVR, GFCI, or Modbus, you add external accessories or step to a 3VA2 electronic-trip variant. Rated insulation voltage 800 V — the breaker's internal creepage and clearance are designed for 800 V systems, so it can be used on 690 V line-to-line circuits with margin.","metaTitle":"Siemens SENTRON 3VA1120-4EF36-0AF0 MCCB, 20 A, 121 kA at 240","metaDescription":"Siemens SENTRON 3VA1120-4EF36-0AF0 molded case circuit breaker, 3-pole, 20 A rated at 40 °C, 121 kA interrupting at 240 V. TM240 release, line protection. Active production. Quoted","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"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":"Yes","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","Of The Supplied Basic Switch":"3VA11204EF360AA0","Design Of The Auxiliary Switch":"1 auxiliary switch + 1 trip alarm switch HQ","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":"2","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AB12","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=242017&mlfb=3VA1120-4EF36-0AF0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF36-0AF0/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-4EF36-0AF0","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/3VA1120-4EF36-0AF0 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}}