{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-3GF42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-3GF42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-3GF42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-3GF42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-3GF42-0AA0, 4-pole molded case circuit breaker, 20 A, TM240 thermal-magnetic release, breaking capacity 75.6 kA at 240 V AC.","salesMarkdown":"## Integrator note: 3VA1120-3GF42-0AA0 The Siemens 3VA1120-3GF42-0AA0 is a SENTRON-series 4-pole molded case circuit breaker (MCCB) with a 20 A continuous rating and a TM240 thermal-magnetic release — the '240' indicates the fixed trip unit's thermal calibration, so no field-adjustable overload pickup. Breaking capacity runs 75.6 kA at 240 V AC, 52.5 kA at 415 V, and 32 kA at 440 V; at 500 V and 690 V it holds 11.9 kA. That's a strong interrupt rating for a 20 A frame — useful for high-fault panels where a cheaper MCB would need upstream fuses. ## Panel fit and thermal derating Footprint is 101.6 mm wide by 130 mm tall by 70 mm deep — standard 4-pole MCCB envelope for a 100 A frame. The breaker carries its full 20 A from 40 °C through 55 °C; at 60 °C and 65 °C it derates to 19 A, and at 70 °C it's still 19 A. That's a shallow derating curve — good for a crowded enclosure with limited airflow.","metaTitle":"Siemens 3VA1120-3GF42-0AA0 SENTRON MCCB, 20 A, 4-Pole, 75.6","metaDescription":"Siemens 3VA1120-3GF42-0AA0 SENTRON 4-pole MCCB, 20 A rated, TM240 release. Breaking capacity 75.6 kA at 240 V. Active production. Available to order; RFQ for pricing.","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":"20 A","Minimum":"20 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":"100%","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":"nut keeper kit on both ends","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=172875&mlfb=3VA1120-3GF42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-3GF42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA1120-3GF42-0AA0 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 quote."},{"question":"What is the breaking capacity of 3VA1120-3GF42-0AA0 at different voltages?","answer":"Breaking capacity is 75.6 kA at 240 V AC, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V AC."},{"question":"Will 3VA1120-3GF42-0AA0 drop into a panel specified for 3VA1020-3ED36-0AA0?","answer":"The 3VA1120-3GF42-0AA0 shares the same 4-pole SENTRON frame size (101.6 mm wide, 130 mm tall, 70 mm deep) as other 3VA1xxx breakers, so mechanical fit should be identical — but verify the trip unit rating and breaking capacity match your coordination study before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-3GF42-0AA0","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/3VA1120-3GF42-0AA0 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}}