{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1225-5FF42-0KA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1225-5FF42-0KA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1225-5FF42-0KA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1225-5FF42-0KA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1225-5FF42-0KA0, molded case circuit breaker, 4-pole, 250 A rated continuous current, TM240 thermal-magnetic release, line protection version.","salesMarkdown":"That 250 A holds flat from 40 °C through 50 °C, then derates to 243.3 A at 55 °C and 223 A at 70 °C — so in a warm enclosure you lose about 11% of headroom by the time you hit 70 °C ambient. The interrupting ratings are what drive the bus bracing decision: 187 kA at 240 V, 121 kA at 415 V, 36 kA at 440 V, and 17 kA at 690 V. ## Sizing and selectivity — the TM240 release and N-conductor protection The N-conductor protection is set at 50 % of the phase rating, which is typical for 4-pole breakers feeding loads where the neutral is sized at half the phase conductors — common in North American 277/480 V Y panels. ## Panel fit and physical integration Front protection is IP40, so it is dust-protected on the face but not sealed against hose-down; keep it inside a cabinet rated for the environment. ## What the interrupting ratings mean for your fault-current study At 415 V the 121 kA still exceeds what most 2 MVA substations can push into a bolted fault.","metaTitle":"Siemens 3VA1225-5FF42-0KA0 SENTRON MCCB, 250A, 4-Pole, TM240","metaDescription":"Siemens SENTRON 3VA1225-5FF42-0KA0 molded case circuit breaker, 250A rated continuous current, 4-pole, TM240 release, 187kA at 240V. Quoted 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":"187 kA","at 415 V":"121 kA","at 440 V":"36 kA","at 690 V":"17 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 A","at 70 °C":"223 A","Trip indicator":"No","Number of poles":"4","Product version":"Line protection","Voltage trigger":"Yes","lifecycle_stage":"current","Product brand name":"SENTRON","Product designation":"Molded case circuit breaker","Latching - endurance":"15 000","Undervoltage Release":"No","Communication Function":"No","Phase failure detection":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","Auxiliary contact version":"Without","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Rated continuous current Iu":"250 A","Rated insulation voltage Ui":"800 V","Design of the auxiliary release":"Shunt trip (STL)","Ground fault monitoring version":"Without","Of The Integrated Auxiliary Trip":"3VA9688-0BL33","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":"50%","Reference code / acc. to DIN EN 81346-2":"Q","Adjustable response value time / tr max.":"1","Adjustable response value time / tr min.":"1","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 / Ir max.":"250 A","Adjustable response value current / li max.":"2 500 A","Adjustable response value current / li min.":"1 250 A","Adjustable response value current / lr min.":"175 A","Neutral conductors / upgradeable/retrofittable":"No","Number of CO contacts / for auxiliary contacts":"0","Protective function of the overcurrent release":"LI","Switching capacity class of the circuit breaker":"M","Max. rated operational current of the frame size":"250 A","Max. rated operational voltage Ue with AC 50/60Hz":"690 V","Type of electrical connection / for main current circuit":"lug terminal","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","Type of connectable conductor cross-section, connection screw, width x thickness , min.":"13 x 1"}},"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=568733&mlfb=3VA1225-5FF42-0KA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1225-5FF42-0KA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA1225-5FF42-0KA0 and what is the lead time?","answer":"This MCCB is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or lead-time figure is published here."},{"question":"Will 3VA1225-5FF42-0KA0 drop into a panel specified around 3VA1110-5EE32-0JA0 without rewiring?","answer":"No — the 3VA1225-5FF42-0KA0 is a 250 A frame (physically larger) whereas the 3VA1110-5EE32-0JA0 is a 100 A frame. The mounting hole pattern and bus-bar spacing differ between the two frame sizes, so you cannot simply swap one for the other in an existing panel without mechanical modifications."},{"question":"What compliance documentation does Siemens provide for 3VA1225-5FF42-0KA0?","answer":"As a standard SENTRON MCCB, it carries IEC 60947-2 certification and UL 489 listing. RoHS and REACH declarations are available from Siemens' documentation portal. The rated insulation voltage of 800 V and interrupting ratings at multiple voltage levels are published in the device manual."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1225-5FF42-0KA0","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/3VA1225-5FF42-0KA0 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}}