{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-4EF32-0AH0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-4EF32-0AH0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-4EF32-0AH0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF32-0AH0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-4EF32-0AH0, 3-pole molded case circuit breaker, 20 A rated continuous current, TM240 thermal-magnetic release, line protection, 121 kA at 240 V, 75.6 kA at 415 V.","salesMarkdown":"## MCCB for distribution panels — 20 A, 3-pole, line protection It carries 121 kA breaking capacity at 240 V and 75.6 kA at 415 V, so it handles high-fault utility feeds in distribution switchboards without cascading upstream. The 20 A rating holds flat from 40 °C through 50 °C; above that it derates linearly to 18 A at 70 °C. That matters for a panel near a furnace line or in a hot electrical room — at 55 °C you lose 0.8 A, at 60 °C you lose 1.2 A, at 65 °C you lose 1.6 A. ## Mechanical fit and panel integration Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that drops into most DIN-rail or panel-mount distribution boards without re-drilling. The 15 000-cycle mechanical endurance is typical for a fixed-mount MCCB in a distribution role; it is not a switching device for frequent motor starts.","metaTitle":"Siemens 3VA1120-4EF32-0AH0 SENTRON MCCB, 20 A, 3-Pole, 121 k","metaDescription":"Siemens SENTRON 3VA1120-4EF32-0AH0 molded case circuit breaker, 20 A rated, 3-pole, line protection, TM240 release. Breaking capacity 121 kA at 240 V. Current production. Available","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":"2 auxiliary switches + 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":"3","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=400041&mlfb=3VA1120-4EF32-0AH0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF32-0AH0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3VA1120-4EF32-0AH0 at 415 V?","answer":"75.6 kA at 415 V, which is the most common three-phase distribution voltage in IEC markets. At 240 V it rises to 121 kA, and at 690 V it drops to 11.9 kA."},{"question":"Will 3VA1120-4EF32-0AH0 drop into a panel specified for 3VA1010-4ED32-0AC0?","answer":"The 3VA1120-4EF32-0AH0 shares the same 3-pole frame size and mounting footprint as the 3VA1010-4ED32-0AC0, so it fits the same panel cutout and bus connections. The difference is in the release — TM240 here versus whatever release the 3VA1010 carries — so verify the trip curve matches your coordination study."},{"question":"What auxiliary contacts does this MCCB include?","answer":"Two auxiliary switches plus one trip alarm switch (HQ configuration). That gives you normally-open/normally-closed status for the main contacts and a separate signal that fires only on a trip event, not on manual open."},{"question":"Where can I buy 3VA1120-4EF32-0AH0?","answer":"This part is sourced and quoted to order against an RFQ through independent industrial distribution. Submit a request for current availability and pricing — confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-4EF32-0AH0","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/3VA1120-4EF32-0AH0 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}}