{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-4EF32-0DA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-4EF32-0DA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-4EF32-0DA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF32-0DA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-4EF32-0DA0, molded case circuit breaker, 3-pole, 20 A rated at 40 °C, TM240 overcurrent release, 121 kA breaking capacity at 240 V, with undervoltage release.","salesMarkdown":"The Siemens 3VA1120-4EF32-0DA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in industrial distribution panels. It's a 3-pole unit rated 20 A continuously at 40 °C, with a TM240 thermal-magnetic overcurrent release — meaning the thermal element handles overloads and the magnetic element handles short-circuits up to its interrupting rating. The breaker carries an undervoltage release (UVR) as a built-in auxiliary release, which trips the breaker when supply voltage drops below a set threshold — useful for preventing motor re-acceleration after a power dip. ## Breaking capacity and selectivity Breaking capacity is the headline number for an MCCB — this one delivers 121 kA at 240 V, 75.6 kA at 415 V, and still holds 11.9 kA at 690 V. Those figures tell you it can safely interrupt fault currents up to those levels without welding contacts or venting arc gas into the panel. For a 20 A frame, that's serious headroom; it coordinates well downstream of a larger feeder breaker without needing a current-limiting fuse upstream in most 480 V panels. Insulation voltage is rated 800 V, so the breaker's internal clearances and creepage are designed for 690 V systems with margin. Power loss at rated current is 14.5 W — modest enough that ventilation in a standard enclosure handles it, but worth checking if you're packing multiple breakers in a sealed cabinet. ## Dimensions and panel fit The 3VA1120-4EF32-0DA0 measures 70 mm deep, 76.2 mm wide, and 130 mm tall. That 76.2 mm width (3 inches) is the standard 3-pole MCCB footprint for this frame size — it mounts on a DIN rail or direct panel-mount with the same hole pattern as other SENTRON 3VA1 breakers. If you're swapping out a competitor's 3-pole MCCB in the same current class, check the mounting centers; the depth is shallow enough for most 200 mm deep enclosures.","metaTitle":"Siemens 3VA1120-4EF32-0DA0 SENTRON MCCB, 20 A, 3-Pole, 121 k","metaDescription":"Siemens 3VA1120-4EF32-0DA0 SENTRON molded case circuit breaker, 20 A rated, 3-pole, 121 kA breaking capacity at 240 V. Active production. Quoted 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","Maximum":"0 A","Minimum":"0 A","at 240 V":"121 kA","at 415 V":"75.6 kA","at 440 V":"52.5 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":"No","Number Of Poles":"3","Voltage Trigger":"No","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Molded case circuit breaker","Undervoltage Release":"Yes","Design Of The Product":"Line protection","Communication Function":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"14.5 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Of The Supplied Basic Switch":"3VA11204EF320AA0","Design Of The Auxiliary Release":"undervoltage release (UVR)","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":"3VA9608-0BB25","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":"0","Switching Capacity Class Of The Circuit Breaker":"S","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=123382&mlfb=3VA1120-4EF32-0DA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-4EF32-0DA0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3VA1120-4EF32-0DA0 at 415 V?","answer":"75.6 kA at 415 V, per the specification."},{"question":"Does this MCCB include an undervoltage release?","answer":"Yes, it ships with an undervoltage release (UVR) as the auxiliary release."},{"question":"Where can I buy 3VA1120-4EF32-0DA0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-4EF32-0DA0","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/3VA1120-4EF32-0DA0 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}}