{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1225-4EF32-0AD0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1225-4EF32-0AD0","canonicalUrl":"https://aoctrl.com/siemens/3VA1225-4EF32-0AD0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1225-4EF32-0AD0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON molded case circuit breaker, 3VA1225-4EF32-0AD0, 3-pole, 250 A (40 °C), TM240 thermal-magnetic release, 121 kA breaking capacity at 240 V, line protection design.","salesMarkdown":"The Siemens SENTRON 3VA1225-4EF32-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated 250 A continuous at 40 °C, with a TM240 thermal-magnetic overcurrent release. The 121 kA breaking capacity at 240 V (75.6 kA at 415 V, 52.5 kA at 440 V) gives it the interrupting muscle to handle high-fault utility or transformer-fed panels without cascading failure upstream. That keeps it simple and reliable for standard overcurrent protection, but means coordination studies rely on the fixed trip curve. ## Current derating and thermal reality 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. ## Mechanical fit and auxiliary options The basic switch supplied is order code 3VA12254EF320AA0, and it accepts up to 3 auxiliary switches (HQ type). No undervoltage release, no shunt trip, no voltage trigger — this is a bare-bones line protection breaker. If you need those accessories, you'll need to add them separately.","metaTitle":"Siemens 3VA1225-4EF32-0AD0 SENTRON MCCB, 250A, 3-Pole, 121kA","metaDescription":"Siemens SENTRON 3VA1225-4EF32-0AD0 molded case circuit breaker, 250A rated at 40°C, 3-pole, TM240 release, 121 kA breaking 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":"105 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]":"4.13 in","Height [In]":"6.22 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":"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":"3VA12254EF320AA0","Design Of The Auxiliary Switch":"3 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","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":"3","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=568482&mlfb=3VA1225-4EF32-0AD0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1225-4EF32-0AD0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of this MCCB at 240 V?","answer":"121 kA at 240 V. It also carries 75.6 kA at 415 V, 52.5 kA at 440 V, 17 kA at 500 V, and 11.9 kA at 690 V."},{"question":"What does the TM240 release mean?","answer":"TM240 is a fixed thermal-magnetic overcurrent release rated 240 A frame — the breaker is set for 250 A continuous at 40 °C, but the release mechanism is designed around the 240 A trip curve. No electronic adjustment, no communication, no ground-fault monitoring."},{"question":"Where can I buy 3VA1225-4EF32-0AD0?","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 price and lead time."},{"question":"Will 3VA1225-4EF32-0AD0 drop into a panel specified around 5SQ2370-2YA05?","answer":"Not without checking the mounting footprint and bus connection. The 5SQ2370-2YA series is a different form factor and manufacturer. This SENTRON MCCB uses a standard DIN-rail or panel-mount base, but you need to verify bus bar spacing and lug dimensions against the existing panel layout."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1225-4EF32-0AD0","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/3VA1225-4EF32-0AD0 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}}