{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-3EF32-0KH0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-3EF32-0KH0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-3EF32-0KH0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-3EF32-0KH0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-3EF32-0KH0, Molded case circuit breaker, 3-pole, 20 A rated at 40 °C, breaking capacity 75.6 kA at 240 V, line protection design, with shunt trip and 2 aux switches + 1 trip alarm.","salesMarkdown":"Three-pole, rated 20 A continuously at 40 °C — and it holds that rating all the way up to 55 °C before derating to 19 A at 60 °C and above. Breaking capacity is the headline here: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That's a high-interrupting rating for a 20 A frame — it clears severe fault currents without cascading upstream, which simplifies selective coordination studies. The shunt trip lets a remote signal — from a safety relay, PLC, or E-stop circuit — open the breaker under load. That's a 3-inch-wide footprint — standard for a 3-pole SENTRON 3VA1 frame. Power loss at full rated current is 12 W maximum. In a sealed, uncooled enclosure that heat adds up — account for it in the thermal budget alongside adjacent devices. ## What the auxiliary switch block means for the controls engineer The aux switches mirror the main contact position (open/closed). The trip alarm switch changes state only when the breaker trips on fault — it stays put during manual switching, so a control system can distinguish a maintenance open from a fault event. That's the HQ designation: a separate, latched indication that the breaker cleared a short circuit or overload. The shunt trip (STL) is a separate release coil that opens the breaker when energized. It draws momentarily — not rated for continuous energization.","metaTitle":"Siemens 3VA1120-3EF32-0KH0 SENTRON MCCB, 20A, 3-Pole, 75.6kA","metaDescription":"Siemens SENTRON 3VA1120-3EF32-0KH0 molded case circuit breaker, 20A rated at 40°C, 3-pole, 75.6kA breaking capacity at 240V. Active production, sourced to order. RFQ for volume pri","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","Maximum":"0 A","Minimum":"0 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]":"3 in","Height [In]":"5.12 in","Trip Indicator":"Yes","Number Of Poles":"3","Voltage Trigger":"Yes","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","Of The Supplied Basic Switch":"3VA11203EF320AA0","Design Of The Auxiliary Switch":"2 auxiliary switches + 1 trip alarm switch HQ","Design Of The Auxiliary Release":"shunt trip (STL)","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","Of The Integrated Auxiliary Trip Unit":"3VA9688-0BL33","Product Function / Grounding Protection":"No","operating voltage / at AC / rated value":"690 V","operating voltage / at DC / rated value":"500 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":"3","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AB12","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=481957&mlfb=3VA1120-3EF32-0KH0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-3EF32-0KH0/alternatives.json"},"ai":{"faq":[{"question":"Will 3VA1120-3EF32-0KH0 drop into a panel specified around 3VA1110-5ED36-0AC0 without rewiring?","answer":"The 3VA1120 frame shares the same 76.2 mm width and DIN-rail mounting pattern as the 3VA1110 series, so mechanical fit is identical. However, the 3VA1120-3EF32-0KH0 carries a shunt trip and a different auxiliary switch configuration — verify the control wiring matches before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-3EF32-0KH0","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/3VA1120-3EF32-0KH0 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}}