{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-4GE42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-4GE42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-4GE42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4GE42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-4GE42-0AA0, molded case circuit breaker, 4-pole, 20 A, TM220 release, 121 kA at 240 V, line protection.","salesMarkdown":"## What this 20 A MCCB covers on the line The Siemens 3VA1120-4GE42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 20 A continuous at 40 °C, with a 4-pole configuration and a TM220 thermal-magnetic release. ## Breaking capacity across voltage taps — what the numbers mean The 3VA1120-4GE42-0AA0 carries multiple interrupting ratings because the same arc-extinction chamber performs differently as system voltage rises. At 240 V it clears 121 kA; at 415 V it is still 75.6 kA; at 500 V and 690 V it drops to 11.9 kA. For a 480 V panel in North America the 75.6 kA at 415 V is the closest reference — that is well above typical 480 V SCCR requirements for most industrial switchboards. The 11.9 kA at 690 V is the limiting case: if your system runs 600 V class, this breaker still holds a useful 11.9 kA, enough for most motor control centers but not for high-fault utility feeds at that voltage. ## Thermal derating and panel environment Rated 20 A from 40 °C up to 55 °C, then derates to 19 A at 60–70 °C. That flat 20 A band through 55 °C is useful — many MCCBs start derating at 40 °C, so this one gives you full rating in a warm enclosure. Dimensions: 130 mm height, 101.6 mm width, 70 mm depth. The optional motor drive accessory (listed as available) means you can add remote trip or reset without changing the breaker frame. ## What the TM220 release does The TM220 designation means a thermal-magnetic release with a fixed thermal pickup at 20 A and a magnetic short-circuit pickup set at 20x In (400 A). That is a standard distribution profile — the magnetic trip is high enough to avoid nuisance tripping on motor inrush or capacitor bank charging, but still fast on a bolted fault. No ground-fault monitoring built in; if you need GF protection, you add an external module or specify the GF variant.","metaTitle":"Siemens 3VA1120-4GE42-0AA0 SENTRON MCCB, 20A 4-Pole, 121kA@2","metaDescription":"Siemens 3VA1120-4GE42-0AA0 SENTRON MCCB, 20A rated, 4-pole line protection, 121 kA breaking at 240 V. Current production. Quoted to order against RFQ.","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","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]":"4 in","Height [In]":"5.12 in","Number Of Poles":"4","Product version":"Line protection","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Molded case circuit breaker","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","rated insulation voltage Ui":"800 V","Courant permanent assigné Iu":"20 A","Ground-Fault Monitoring Version":"Without","Design Of The Overcurrent Release":"TM220","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":"100%","reference code / acc. to IEC 81346-2":"Q","Max. rated operational voltage Ue with DC":"600 V","Product Extension / Optional / Motor Drive":"Yes","Adjustable response value current / li max.":"320 A","Adjustable response value current / li min.":"320 A","Neutral conductors / upgradeable/retrofittable":"No","Protection Function Of The Overcurrent Release":"LI","number of CO contacts / for auxiliary contacts":"0","Switching Capacity Class Of The Circuit Breaker":"S","Max. rated operational current of the frame size":"160 A","Mechanical Service Life (Switching Cycles) / Typical":"20 000","Arrangement Of Electrical Connectors / For Main Current Circuit":"Front terminal","Type of connectable conductor cross-section, connection screw, width x thickness , max.":"17 x 6.5 mm","Type of connectable conductor cross-section, connection screw, width x thickness , min.":"12 x 1 mm"}},"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=408819&mlfb=3VA1120-4GE42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4GE42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA1120-4GE42-0AA0 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 number."},{"question":"What is the depth of 3VA1120-4GE42-0AA0?","answer":"70 mm (2.76 inches) — the dimension that determines enclosure depth clearance."},{"question":"Will 3VA1120-4GE42-0AA0 drop into a panel specified for 3VA1020-3ED36-0AA0?","answer":"Both are SENTRON 3VA frame MCCBs with the same 70 mm depth and 101.6 mm width, so the physical footprint and mounting pattern are identical. The electrical ratings differ — verify the interrupting capacity and release type against your coordination study before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-4GE42-0AA0","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/3VA1120-4GE42-0AA0 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}}