{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-4EF32-0KH0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-4EF32-0KH0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-4EF32-0KH0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF32-0KH0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-4EF32-0KH0, molded case circuit breaker, 3-pole, 20 A, TM240 release, shunt trip, 121 kA at 240 V, IP40 front.","salesMarkdown":"It is a line-protection device — meaning it protects cables and busbars from overload and short-circuit, not a motor-protection breaker with adjustable trip curves. At 415 V it still breaks 75.6 kA, and at 690 V it holds 11.9 kA — so it stays selective across common industrial voltage levels. Above that it derates: 19.2 A at 55 °C, 18.8 A at 60 °C, 18.4 A at 65 °C, and 18 A at 70 °C. That is the number to use for conductor sizing and load planning, not the 20 A nameplate. ## Auxiliary and trip options The shunt trip is field-wired to a control voltage — common for emergency-stop or PLC-driven shutdown circuits. The integrated auxiliary trip order code is 3VA9688-0BL33, which is the factory-fit accessory that comes pre-installed. Dimensions are 76.2 mm wide, 130 mm tall, 70 mm deep — that is a standard 3-pole MCCB footprint for the SENTRON 3VA platform. The 15,000-cycle mechanical endurance is typical for this class — enough for a distribution feeder that operates a few times a year, not a daily-switched load.","metaTitle":"Siemens 3VA1120-4EF32-0KH0 SENTRON MCCB, 20 A, 3-pole, 121 k","metaDescription":"Siemens SENTRON 3VA1120-4EF32-0KH0 molded case circuit breaker, 20 A rated, 3-pole, 121 kA breaking at 240 V. TM240 release, shunt trip. Current production. 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":"Yes","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":"Shunt trip (STL)","Ground fault monitoring version":"Without","Of The Integrated Auxiliary Trip":"3VA9688-0BL33","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=285204&mlfb=3VA1120-4EF32-0KH0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF32-0KH0/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3VA1120-4EF32-0KH0?","answer":"Submit an RFQ through this listing. Pricing and stock are confirmed at quote time; the part is sourced through independent distribution and quoted to order."},{"question":"Will 3VA1120-4EF32-0KH0 drop into a panel specified around 3VA1110-5EE32-0JA0 without rewiring?","answer":"Both are 3-pole SENTRON 3VA MCCBs on the same 76.2 mm wide footprint, so the mechanical fit is the same. However, the 3VA1120-4EF32-0KH0 carries a TM240 release and a 20 A rating, while the 3VA1110-5EE32-0JA0 is a different rating and release variant — verify the load current and trip curve before swapping."},{"question":"What is the depth of 3VA1120-4EF32-0KH0?","answer":"70 mm."},{"question":"What is the width of 3VA1120-4EF32-0KH0?","answer":"76.2 mm."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-4EF32-0KH0","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/3VA1120-4EF32-0KH0 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}}