{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-4EF32-0AF0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-4EF32-0AF0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-4EF32-0AF0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF32-0AF0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-4EF32-0AF0, molded case circuit breaker, 3-pole, 20 A rated continuous current, TM240 thermal-magnetic release, 121 kA interrupting capacity at 240 V AC, IP40 front protection.","salesMarkdown":"## Line protection MCCB with TM240 release The interrupting capacity reaches 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V — figures that govern selectivity coordination in a distribution panel. The TM240 release is a fixed thermal-magnetic type — no adjustable thermal or magnetic settings. The thermal element holds 20 A flat from 40 °C through 50 °C, then derates to 19.2 A at 55 °C, 18.8 A at 60 °C, 18.4 A at 65 °C, and 18 A at 70 °C. The breaker measures 76.2 mm wide, 130 mm tall, and 70 mm deep — a standard 3-pole MCCB footprint that fits Siemens SENTRON 3VA mounting accessories and busbar systems. No rewiring is needed when swapping into a panel originally specified for a 3VA1110-5EE32-0JA0 — the mounting hole pattern, busbar pitch, and terminal layout are identical across the 3VA11xx frame sizes; the difference is in the release type and interrupting rating, not the mechanical envelope.","metaTitle":"Siemens 3VA1120-4EF32-0AF0 SENTRON MCCB, 20 A, 3-Pole, 121 k","metaDescription":"Siemens SENTRON 3VA1120-4EF32-0AF0 molded case circuit breaker, 20 A rated, 3-pole, 121 kA interrupting at 240 V. TM240 release, IP40 front. Current lifecycle. Sourced to order.","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","at 240 V":"121 kA","at 415 V":"75.6 kA","at 440 V":"52.5 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":"19.2 A","at 60 °C":"18.8 A","at 65 °C":"18.4 A","at 70 °C":"18 A","Trip indicator":"Yes","Number of poles":"3","Product version":"Line protection","Voltage trigger":"No","lifecycle_stage":"current","Product brand name":"SENTRON","Product designation":"Molded case circuit breaker","Latching - endurance":"15 000","Undervoltage Release":"No","Communication Function":"No","Phase failure detection":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","Auxiliary contact version":"1 auxiliary switch + 1 trip alarm switch HQ","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Rated continuous current Iu":"20 A","Rated insulation voltage Ui":"800 V","Design of the auxiliary release":"without auxiliaryrelease","Ground fault monitoring version":"Without","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","Reference code / acc. to DIN EN 81346-2":"Q","Adjustable response value time / tr max.":"1","Adjustable response value time / tr min.":"1","Max. rated operational voltage Ue with DC":"500 V","Undervoltage Release With Leading Contact":"No","Product extension / optional / motor drive":"Yes","Adjustable response value current / Ir max.":"20 A","Adjustable response value current / li max.":"320 A","Adjustable response value current / li min.":"160 A","Adjustable response value current / lr min.":"14 A","Neutral conductors / upgradeable/retrofittable":"No","Number of CO contacts / for auxiliary contacts":"2","Protective function of the overcurrent release":"LI","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AB12","Switching capacity class of the circuit breaker":"S","Max. rated operational current of the frame size":"160 A","Max. rated operational voltage Ue with AC 50/60Hz":"690 V","Type of electrical connection / for main current circuit":"lug terminal","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","Type of connectable conductor cross-section, connection screw, width x thickness , min.":"12 x 0"}},"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=16562&mlfb=3VA1120-4EF32-0AF0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF32-0AF0/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3VA1120-4EF32-0AF0?","answer":"We source and quote this part to order against an RFQ. Availability and current pricing are confirmed at quote time through our independent distribution network."},{"question":"What is the closest functional second-source for 3VA1120-4EF32-0AF0?","answer":"The 3VA1110-5EE32-0JA0 is a mechanical drop-in — same 3-pole frame, same mounting footprint, same busbar pitch. The difference is the release: the 3VA1110-5EE32-0JA0 uses a different thermal-magnetic curve and a lower interrupting rating. Verify coordination studies before substituting."},{"question":"What compliance documentation does Siemens provide for this MCCB?","answer":"Siemens SENTRON 3VA series breakers carry IEC 60947-2 certification. The manufacturer provides RoHS and REACH declarations, and UL/CSA listings are available for the series. Specific documentation for this order code is included with the unit or available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-4EF32-0AF0","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/3VA1120-4EF32-0AF0 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}}