{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VM1225-3ED42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VM1225-3ED42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VM1225-3ED42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VM1225-3ED42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VM1225-3ED42-0AA0, 4-pole molded case circuit breaker, 250 A at 40 °C, TM210 release, breaking capacity 76 kA at 240 VAC.","salesMarkdown":"It's the kind of breaker you spec into a main distribution panel or a large feeder when you need reliable overcurrent and short-circuit protection at 250 A continuous. ## Breaking capacity — what it clears and where This MCCB's interrupting rating changes with system voltage, which is typical for molded case breakers. At 240 V it clears 76 kA; at 415 V it's 53 kA; at 440 V it drops to 32 kA; and at 500 V it's 12 kA. That means on a 415 V industrial feeder it still handles substantial fault currents — enough for most secondary distribution applications — but on a 500 V system you need to check that 12 kA exceeds your available fault current. The 4-pole design (three phases plus neutral) lets you protect a TN or TT system where the neutral needs switching. No ground-fault monitoring or N-conductor protection built in — this is a straight line-protection breaker. ## Thermal derating — don't ignore it Above that the TM210 release starts to back off: 243.3 A at 55 °C, 236.5 A at 60 °C, 229.8 A at 65 °C, and 223 A at 70 °C. The 57 W maximum power loss is at full rating — that's the heat you're managing inside the cabinet. Dimensions are 70 mm deep by 140 mm wide by 158 mm high — that's a 2.8 x 5.5 x 6.2 inch footprint. Fits standard panel-mount cutouts for 4-pole MCCBs in this class.","metaTitle":"Siemens 3VM1225-3ED42-0AA0 SENTRON MCCB, 250 A, 76 kA at 240","metaDescription":"Siemens 3VM1225-3ED42-0AA0 SENTRON molded case circuit breaker, 4-pole, 250 A, 76 kA breaking capacity at 240 VAC. 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":"140 mm","Height":"158 mm","at 240 V":"76 kA","at 415 V":"53 kA","at 440 V":"32 kA","at 500 V":"12 kA","at 40 °C":"250 A","at 45 °C":"250 A","at 50 °C":"250 A","at 55 °C":"243.3 A","at 60 °C":"236.5 A","at 65 °C":"229.8 A","at 70 °C":"223 A","Depth [In]":"2.8 in","Width [In]":"5.5 in","Height [In]":"6.2 in","Number Of Poles":"4","Product version":"Line protection","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Molded case circuit breaker","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","rated insulation voltage Ui":"690 V","Ground-Fault Monitoring Version":"Without","Design Of The Overcurrent Release":"TM210","Design Of Short-Circuit Protection":"For switching capacity values in DC power systems, see the 3VA Molded Case Circuit Breaker Manual; link available 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":"500 V","Product Extension / Optional / Motor Drive":"No","Adjustable response value current / li max.":"2 500 A","Neutral conductors / upgradeable/retrofittable":"No","Protection Function Of The Overcurrent Release":"LI","number of CO contacts / for auxiliary contacts":"0","Switching Capacity Class Of The Circuit Breaker":"N","Max. rated operational voltage Ue with AC 50/60Hz":"500 V","Mechanical Service Life (Switching Cycles) / Typical":"15 000","Arrangement Of Electrical Connectors / For Main Current Circuit":"Front connection"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/bfaa85f9e5b8d6ecb41e182dfa2de460.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=627680&mlfb=3VM1225-3ED42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VM1225-3ED42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of this MCCB at different voltages?","answer":"At 240 V it clears 76 kA; at 415 V it's 53 kA; at 440 V it's 32 kA; at 500 V it's 12 kA. The interrupting rating drops as system voltage rises."},{"question":"What does the TM210 release designation mean?","answer":"TM210 indicates a thermal-magnetic release with an adjustable long-time pickup range up to 2500 A. The fixed thermal element provides overload protection; the magnetic element handles short circuits."},{"question":"Where can I buy 3VM1225-3ED42-0AA0 and how is it quoted?","answer":"We source this breaker to order against an RFQ through our independent distribution network. Availability and current pricing are confirmed at quote time — no stock figures or prices on this page."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VM1225-3ED42-0AA0","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/3VM1225-3ED42-0AA0 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}}