{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1225-4EF42-0CH0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1225-4EF42-0CH0","canonicalUrl":"https://aoctrl.com/siemens/3VA1225-4EF42-0CH0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1225-4EF42-0CH0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1225-4EF42-0CH0, molded case circuit breaker, 4-pole, 250 A rated continuous current (Iu), TM240 thermal-magnetic release, line protection version, with undervoltage release and 2 auxiliary + 1 trip alarm switch.","salesMarkdown":"The Siemens 3VA1225-4EF42-0CH0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current (Iu) with a TM240 thermal-magnetic release — the thermal element handles overloads, the magnetic element handles short-circuits, and the 240 designation means the thermal pickup is calibrated for a 240 A frame. At 415 V the interrupting rating drops to 75.6 kA, at 440 V to 25 kA, and at 690 V to 11.9 kA — the voltage derating is normal for MCCBs, so verify your available fault current at the actual system voltage before specifying. The IP40 front protection means the breaker face is protected against solid objects over 1 mm, but the enclosure itself must provide the overall panel IP rating. ## Thermal derating and endurance — the real-world limits At 55 °C it derates to 243.3 A, at 60 °C to 236.5 A, at 65 °C to 229 A, and at 70 °C to 223 A. Mechanical endurance is rated at 15 000 operations — that's the latching mechanism life, not the electrical contact life under load, which will be lower depending on switching frequency and fault-clearing history. ## Auxiliary contacts and undervoltage release — what's on board The auxiliary contact set (2 NO/NC changeovers) reports breaker position; the trip alarm switch signals a fault trip separately from a manual open. The integrated auxiliary trip order code is 3VA9608-0BB24 if you need a replacement module. Width 140 mm, height 158 mm, depth 70 mm. Verify gland plate cutouts and busbar spacing against these dimensions before panel layout.","metaTitle":"Siemens 3VA1225-4EF42-0CH0 SENTRON MCCB, 250 A, 4-Pole, TM24","metaDescription":"Siemens 3VA1225-4EF42-0CH0 SENTRON molded case circuit breaker, 250 A rated continuous current, 4-pole, TM240 thermal-magnetic release, 121 kA at 240 V. Active production. Quoted t","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":"121 kA","at 415 V":"75.6 kA","at 440 V":"25 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":"243.3 A","at 60 °C":"236.5 A","at 65 °C":"229 A","at 70 °C":"223 A","Trip indicator":"Yes","Number of poles":"4","Product version":"Line protection","Voltage trigger":"No","lifecycle_stage":"current","Product brand name":"SENTRON","Product designation":"Molded case circuit breaker","Latching - endurance":"15 000","Undervoltage Release":"Yes","Communication Function":"No","Phase failure detection":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","Auxiliary contact version":"2 auxiliary switches + 1 trip alarm switch HQ","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":"Undervoltage release (UVR)","Ground fault monitoring version":"Without","Of The Integrated Auxiliary Trip":"3VA9608-0BB24","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","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":"3","Protective function of the overcurrent release":"LI","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AB12","Switching capacity class of the circuit breaker":"S","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=568519&mlfb=3VA1225-4EF42-0CH0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1225-4EF42-0CH0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3VA1225-4EF42-0CH0 at different voltages?","answer":"121 kA at 240 V, 75.6 kA at 415 V, 25 kA at 440 V, and 11.9 kA at 690 V. The interrupting rating decreases as voltage increases, which is standard for MCCBs."},{"question":"What auxiliary contacts and releases come with this MCCB?","answer":"Factory-fitted with 2 auxiliary switches plus 1 trip alarm switch (HQ) and an undervoltage release (UVR). The integrated auxiliary trip module order code is 3VA9608-0BB24."},{"question":"Where can I buy 3VA1225-4EF42-0CH0 and how is it quoted?","answer":"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."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1225-4EF42-0CH0","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/3VA1225-4EF42-0CH0 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}}