{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1225-4EF42-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1225-4EF42-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1225-4EF42-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1225-4EF42-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1225-4EF42-0BA0, Molded case circuit breaker, 4-pole, 250 A at 40 °C, TM240 release, 121 kA at 240 V, undervoltage release, line protection.","salesMarkdown":"This is the current it'll hold all day in a 40 °C panel — no derating needed at that ambient. The TM240 thermal-magnetic release handles overloads and short-circuits; the built-in undervoltage release (UVR) trips the breaker if control voltage drops, which is standard for motor feeder disconnects and emergency-stop chains. ## Breaking capacity — what it means for fault duty This MCCB interrupts 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, 17 kA at 500 V, and 11.9 kA at 690 V. The 121 kA at 240 V is typical for North American 120/240 V split-phase service entrances; the 75.6 kA at 415 V covers most European 400 V industrial distribution. The breaker holds 250 A continuously from 40 °C up through 50 °C. Above that, it derates: 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. The 70 mm depth means it clears most shallow enclosures. The TM240 release is fixed-trip, not adjustable, so the overload curve is set at the factory.","metaTitle":"Siemens 3VA1225-4EF42-0BA0 SENTRON MCCB, 250A, 4-Pole, 121kA","metaDescription":"Siemens SENTRON 3VA1225-4EF42-0BA0 molded case circuit breaker, 250A continuous at 40°C, 4-pole, TM240 release, undervoltage release included. Breaking capacity 121kA at 240V AC. A","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"70 mm","Width":"140 mm","Height":"158 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":"17 kA","at 690 V":"11.9 kA","at 40 °C":"250 A","at 45 °C":"250 A","at 50 °C":"250 A","at 55 °C":"243 A","at 60 °C":"237 A","at 65 °C":"230 A","at 70 °C":"223 A","Depth [In]":"2.76 in","Width [In]":"5.51 in","Height [In]":"6.22 in","Trip Indicator":"No","Number Of Poles":"4","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":"59.5 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Of The Supplied Basic Switch":"3VA12254EF420AA0","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","design of the N-conductor protection":"without","Of The Integrated Auxiliary Trip Unit":"3VA9608-0BB11","Product Function / Grounding Protection":"No","operating voltage / at AC / rated value":"690 V","operating voltage / at DC / rated value":"600 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=568514&mlfb=3VA1225-4EF42-0BA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1225-4EF42-0BA0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3VA1225-4EF42-0BA0 at 415 V?","answer":"At 415 V AC, the rated ultimate breaking capacity is 75.6 kA. At 240 V it's 121 kA, at 440 V it's 52.5 kA, at 500 V it's 17 kA, and at 690 V it's 11.9 kA."},{"question":"What is the continuous current rating of this MCCB at elevated temperatures?","answer":"Rated 250 A continuous from 40 °C to 50 °C. It derates to 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C."},{"question":"Where can I buy 3VA1225-4EF42-0BA0 and how is it quoted?","answer":"This part is sourced to order through independent distribution. Submit an RFQ for current pricing and availability — both are confirmed at quote time, not on a static listing."},{"question":"Does 3VA1225-4EF42-0BA0 include an undervoltage release?","answer":"Yes, it is equipped with an undervoltage release (UVR) as standard. The design of the auxiliary release is specifically an undervoltage release."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1225-4EF42-0BA0","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/3VA1225-4EF42-0BA0 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}}