{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1225-4EF42-0AE0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1225-4EF42-0AE0","canonicalUrl":"https://aoctrl.com/siemens/3VA1225-4EF42-0AE0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1225-4EF42-0AE0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, Molded case circuit breaker, 3VA1225-4EF42-0AE0, 4-pole, 250 A, TM240 release, 121 kA at 240 V.","salesMarkdown":"Breaking capacity is 121 kA at 240 V and 75.6 kA at 415 V, giving the breaker headroom for high-fault installations like main feeders or transformer secondaries where SCCR must coordinate with upstream gear. The 70 mm depth, 140 mm width, and 158 mm height fit the standard SENTRON 3VA footprint — direct swap into existing Siemens MCCB panel layouts without re-drilling gland plates or reworking bus connections. Max power loss is 57 W, which matters for thermal rise inside a sealed enclosure. ## Current derating and ambient limits Above that, derating is gradual: 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. ## Auxiliary switching and accessories This variant ships with four HQ auxiliary switches (design of the auxiliary switch: 4 auxiliary switches HQ). The supplied basic switch order code is 3VA12254EF420AA0, which is the core MCCB module before auxiliary additions. No trip indicator or voltage trigger is fitted.","metaTitle":"Siemens 3VA1225-4EF42-0AE0 SENTRON MCCB, 250 A, 4-Pole, 121","metaDescription":"Siemens 3VA1225-4EF42-0AE0 SENTRON molded case circuit breaker. 250 A continuous, 4-pole, line protection. Breaking capacity 121 kA at 240 V. Current lifecycle stage. Available to","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":"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":"4 auxiliary switches 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":"4","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AA12","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=568509&mlfb=3VA1225-4EF42-0AE0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1225-4EF42-0AE0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3VA1225-4EF42-0AE0 at 415 V?","answer":"75.6 kA at 415 V, with lower values at higher voltages: 52.5 kA at 440 V, 17 kA at 500 V, and 11.9 kA at 690 V."},{"question":"Where can I buy 3VA1225-4EF42-0AE0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm delivery commitment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1225-4EF42-0AE0","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/3VA1225-4EF42-0AE0 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}}