{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-4GD42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-4GD42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-4GD42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4GD42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-4GD42-0AA0, 4-pole molded case circuit breaker, 20 A, TM210 thermal-magnetic release, interrupting ratings to 121 kA at 240 V.","salesMarkdown":"## What it is and what the ratings mean The Siemens 3VA1120-4GD42-0AA0 is a SENTRON 4-pole molded case circuit breaker (MCCB) rated 20 A continuous at 40 °C, with a TM210 thermal-magnetic trip unit — a fixed thermal and fixed magnetic release designed for line protection in distribution panels and motor branch circuits. The interrupting ratings tell you where this breaker can safely clear a fault: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 500 V and 690 V. That 121 kA figure at 240 V means it handles high-fault-capacity service-entrance or sub-distribution boards without needing a current-limiting fuse upstream — a real spec for high-available-fault installations. Thermal derating is flat from 40 °C through 55 °C at 20 A, then drops to 19 A at 60 °C through 70 °C. If the panel ambient runs hot, you can still load it at 19 A without tripping — no need to oversize the frame. Rated insulation voltage Ui is 800 V, and the maximum DC operational voltage is 600 V — relevant if this breaker lands in a DC-coupled PV combiner or battery rack application. ## Sourcing and lifecycle The 4-pole construction with 100 % N-conductor protection means the neutral pole opens and closes with the phases — required for TN-S or TT systems where the neutral must be switched. ## Integration and compliance Mounts on a DIN rail or panel-mount base; the 70 mm depth and 101.6 mm width fit standard SENTRON 3VA panel cutouts. IP40 on the front face suits enclosed distribution boards — no washdown rating, so keep it behind a panel door in wet environments. Power loss is 12 W maximum at rated current — negligible for thermal budgeting in a populated panel, but worth noting if the enclosure is tightly sealed. The TM210 release is a fixed thermal-magnetic design — no interchangeable trip units, no communication module, no ground-fault monitoring. It is a straight line-protection breaker for simple overcurrent and short-circuit duty.","metaTitle":"Siemens 3VA1120-4GD42-0AA0 SENTRON MCCB, 4P, 20A, TM210, 121","metaDescription":"Siemens 3VA1120-4GD42-0AA0 SENTRON 4-pole MCCB, 20 A, TM210 thermal-magnetic release, 121 kA interrupting at 240 V. Current production. RFQ for pricing and availability.","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":"TM210","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":"https://cdn.aoctrl.com/07c87083d8014101e792e4a6a57f3025.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=348358&mlfb=3VA1120-4GD42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4GD42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3VA1120-4GD42-0AA0?","answer":"Submit an RFQ through this listing. Availability and current pricing are confirmed at quote time through independent distribution channels."},{"question":"What is the closest functional second-source to 3VA1120-4GD42-0AA0?","answer":"The 3VA2025-8HN42-0AA0 is a higher-current variant in the same SENTRON 3VA platform, but it uses a different trip unit and frame size. The 3VA1120-4GD42-0AA0 is a 4-pole, 20 A, TM210 unit; the 3VA2025-8HN42-0AA0 is a larger-frame breaker with a different footprint and interrupting rating. They are not drop-in replacements without rewiring and re-coordination."},{"question":"What is the depth of 3VA1120-4GD42-0AA0?","answer":"70 mm (2.76 in)."},{"question":"What is the width of 3VA1120-4GD42-0AA0?","answer":"101.6 mm (4 in)."},{"question":"Will 3VA1120-4GD42-0AA0 drop into a panel specified around 3VA2025-8HN42-0AA0?","answer":"No — the 3VA2025-8HN42-0AA0 uses a larger frame with different mounting dimensions and busbar spacing. The 3VA1120-4GD42-0AA0 is a 4-pole 20 A breaker in the smaller 3VA1 frame; it will not fit the cutout or bus risers of a panel designed for the 3VA2 frame."},{"question":"What compliance documentation does this breaker carry?","answer":"As a Siemens SENTRON MCCB, it is designed and tested to IEC 60947-2 and UL 489 standards. The front-face IP40 rating is per IEC 60529. Specific RoHS and REACH declarations are available through Siemens Industry Online Support."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-4GD42-0AA0","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/3VA1120-4GD42-0AA0 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}}