{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1225-4EF32-0AG0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1225-4EF32-0AG0","canonicalUrl":"https://aoctrl.com/siemens/3VA1225-4EF32-0AG0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1225-4EF32-0AG0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1225-4EF32-0AG0, molded case circuit breaker, 3-pole, TM240 thermal-magnetic release, 250 A at 40 °C, breaking capacity 121 kA at 240 V AC.","salesMarkdown":"It carries a TM240 thermal-magnetic release, meaning the thermal element handles overloads and the magnetic element handles short circuits — no electronic trip unit to program, just set it and forget it. Rated 250 A continuous at 40 °C ambient, it holds that rating flat through 50 °C — only starts derating above 55 °C, dropping to 223 A at 70 °C. Breaking capacity is the headline number here: 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. At 415 V that's enough to sit upstream of most downstream MCCBs without cascading — the fault current splits across the impedance of the wiring and the downstream breakers, but the upstream device has to survive the full prospective short-circuit current if the fault is bolted at its load terminals. Dimensions: 105 mm wide, 158 mm tall, 70 mm deep. Three-pole footprint matches the standard SENTRON 3VA family, so if you're swapping in a panel that already holds a 3VA frame, the bus-bar and lug positions line up. Power loss max 57 W — that's the heat you need to vent if the panel is sealed; a 57 W continuous loss in a small enclosure can push internal ambient above the 70 °C operating limit if there's no airflow. The storage range is wider because there's no current flowing — the breaker isn't self-heating. If the panel sees -25 °C at startup, the TM240 release still operates within its calibrated curve; no warm-up delay. ## What the TM240 release means in practice TM240 is a fixed thermal-magnetic release rated 240 A at the trip threshold. The breaker itself is rated 250 A continuous at 40 °C, so the release is set slightly below the frame's thermal limit — that's normal. The thermal element is non-interchangeable; you can't swap it for a different rating in the field. If the load grows past 240 A, you replace the whole breaker, not just the trip unit. Trip indicator is present — a mechanical flag on the front that shows whether the breaker tripped on overload or short circuit. This is a basic line-protection MCCB: protect the cable, not the process. The auxiliary switch configuration is 1 auxiliary switch + 1 trip alarm switch HP. That gives one set of contacts for status (open/closed) and one dedicated set that only changes state when the breaker trips on fault — useful for remote alarm annunciation without wiring through the main contact position.","metaTitle":"Siemens 3VA1225-4EF32-0AG0 SENTRON MCCB, 250 A, 3-Pole, 121","metaDescription":"Siemens SENTRON 3VA1225-4EF32-0AG0 molded case circuit breaker, 250 A, 3-pole, TM240 release. Breaking capacity 121 kA at 240 V. Current 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":"Yes","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":"1 auxiliary switch + 1 trip alarm switch HP","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":"2","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AB11","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=568485&mlfb=3VA1225-4EF32-0AG0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1225-4EF32-0AG0/alternatives.json"},"ai":{"faq":[{"question":"Does this breaker have a communication function or ground-fault monitoring?","answer":"No. No communication function, no undervoltage release, no ground-fault monitoring. It's a basic line-protection MCCB with a TM240 thermal-magnetic release and a trip indicator."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1225-4EF32-0AG0","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/3VA1225-4EF32-0AG0 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}}