{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1225-4EF42-0AF0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1225-4EF42-0AF0","canonicalUrl":"https://aoctrl.com/siemens/3VA1225-4EF42-0AF0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1225-4EF42-0AF0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1225-4EF42-0AF0, molded case circuit breaker, 4-pole, 250 A (40 °C), TM240 thermal-magnetic release, 121 kA at 240 V, line protection design.","salesMarkdown":"## What this 4-pole MCCB carries Its TM240 thermal-magnetic release is sized for 250 A continuous at 40 °C, and the breaker holds that rating through 50 °C before it starts to derate — 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. That thermal curve is the one that governs real panel loading; the breaker doesn't trip early if your enclosure runs warm, but you size the conductor and the enclosure ventilation for the temperature you actually see. ## Breaking capacity — what it means for fault duty This MCCB delivers 121 kA interrupting capacity at 240 V, 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 3VA1225-4EF42-0AF0 measures 140 mm wide, 158 mm tall, and 70 mm deep — a standard 4-pole MCCB footprint that fits SENTRON mounting plates and common DIN-rail adapter brackets. ## Operating environment","metaTitle":"Siemens 3VA1225-4EF42-0AF0 SENTRON MCCB, 250A 4-Pole TM240","metaDescription":"Siemens 3VA1225-4EF42-0AF0 SENTRON molded case circuit breaker, 250A at 40°C, 4-pole, TM240 release, 121kA at 240V. Active production. Sourced to order. Request quote.","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":"Yes","Number Of Poles":"4","Voltage Trigger":"No","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":"57 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 Switch":"1 auxiliary switch + 1 trip alarm switch HQ","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","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":"2","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AB12","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=568510&mlfb=3VA1225-4EF42-0AF0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1225-4EF42-0AF0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3VA1225-4EF42-0AF0 at 415 V?","answer":"75.6 kA at 415 V, which covers most European and Asian secondary distribution fault levels."},{"question":"What does the TM240 release designation mean?","answer":"TM240 is the thermal-magnetic release rated for 250 A continuous at 40 °C. The TM prefix indicates a fixed thermal and fixed magnetic trip curve, not adjustable."},{"question":"Where can I buy 3VA1225-4EF42-0AF0 and how is it quoted?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"Does 3VA1225-4EF42-0AF0 include auxiliary contacts?","answer":"Yes, it ships with one auxiliary switch and one trip-alarm switch (HQ type) for remote status and trip indication."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1225-4EF42-0AF0","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/3VA1225-4EF42-0AF0 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}}