{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1225-4EF42-0AD0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1225-4EF42-0AD0","canonicalUrl":"https://aoctrl.com/siemens/3VA1225-4EF42-0AD0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1225-4EF42-0AD0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1225-4EF42-0AD0, 4-pole molded case circuit breaker, 250 A rated at 40 °C, TM240 thermal-magnetic release, 121 kA interrupting at 240 VAC.","salesMarkdown":"## Siemens 3VA1225-4EF42-0AD0 — 250 A SENTRON MCCB The Siemens 3VA1225-4EF42-0AD0 is a 4-pole SENTRON molded case circuit breaker rated for 250 A continuous current at 40 °C ambient, with a TM240 thermal-magnetic overcurrent release. The interrupting rating drops sharply as line voltage rises: 121 kA 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. For a 480 V panel the relevant figure is the 440 V or 500 V column — 52.5 kA or 17 kA respectively — which still exceeds typical 480 V fault levels (usually 10–65 kA) for most commercial-industrial installations. Above 50 °C it steps down: 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. Dimensions: 140 mm wide × 158 mm tall × 70 mm deep. The 70 mm depth (2.76 in) means it clears most 200–300 mm deep enclosures with room for rear-mounted busbars or cable ladders. The 4-pole body occupies 140 mm of DIN-rail or mounting-plate width — plan for a 175 mm minimum bay width to allow finger space for lug torqueing. The HQ auxiliary switch block adds roughly 18 mm to the side, so account for that in the wiring gutter.","metaTitle":"Siemens 3VA1225-4EF42-0AD0 SENTRON MCCB, 250 A, 4P, 121 kA","metaDescription":"Siemens 3VA1225-4EF42-0AD0 SENTRON molded case circuit breaker, 250 A rated, 4-pole, 121 kA breaking at 240 V. Current production. Sourced to order against RFQ.","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","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","Product version":"Line protection","Voltage Trigger":"No","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Molded case circuit breaker","Undervoltage Release":"No","Communication Function":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"57 W","Auxiliary contact version":"3 auxiliary switches HQ","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","rated insulation voltage Ui":"800 V","Of The Supplied Basic Switch":"3VA12254EF420AA0","Courant permanent assigné Iu":"250 A","Design Of The Auxiliary Release":"without auxiliaryrelease","Ground-Fault Monitoring Version":"Without","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","reference code / acc. to IEC 81346-2":"Q","Max. rated operational voltage Ue with DC":"600 V","Undervoltage Release With Leading Contact":"No","Product Extension / Optional / Motor Drive":"Yes","Adjustable response value current / lg min.":"1","Adjustable response value current / li max.":"2 500 A","Adjustable response value current / li min.":"1 250 A","Neutral conductors / upgradeable/retrofittable":"No","Protection Function Of The Overcurrent Release":"LI","number of CO contacts / for auxiliary contacts":"3","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AA12","Switching Capacity Class Of The Circuit Breaker":"S","Max. rated operational current of the frame size":"250 A","Mechanical Service Life (Switching Cycles) / Typical":"20 000","Arrangement Of Electrical Connectors / For Main Current Circuit":"Front terminal","Type of connectable conductor cross-section, connection screw, width x thickness , max.":"25 x 8 mm","Type of connectable conductor cross-section, connection screw, width x thickness , min.":"13 x 1 mm"}},"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=568508&mlfb=3VA1225-4EF42-0AD0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1225-4EF42-0AD0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA1225-4EF42-0AD0 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit a request for quote (RFQ) to confirm current availability, pricing, and lead time."},{"question":"What is the breaking capacity of 3VA1225-4EF42-0AD0 at 480 V?","answer":"At 440 V it interrupts 52.5 kA; at 500 V it interrupts 17 kA. For a 480 V system, the 440 V rating (52.5 kA) is the conservative reference — sufficient for most commercial-industrial panels where available fault current stays under 50 kA."},{"question":"What is the continuous current rating at elevated ambient temperatures?","answer":"Rated 250 A from 40 °C to 50 °C. Derates to 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. No derating needed in standard 40 °C switchboard environments."},{"question":"What compliance documentation does this brand provide for 3VA1225-4EF42-0AD0?","answer":"Standard SENTRON 3VA documentation includes a CE declaration of conformity, UL/CSA recognition, and RoHS/REACH compliance declarations. Specific certificate numbers are available upon request from the manufacturer or distributor."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1225-4EF42-0AD0","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/3VA1225-4EF42-0AD0 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}}