{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1125-3EF42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1125-3EF42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1125-3EF42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1125-3EF42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA series molded case circuit breaker, 3VA1125-3EF42-0AA0, 4-pole, 25 A rated at 40 °C, TM240 thermal-magnetic release, line protection design, 70 mm depth.","salesMarkdown":"It carries a TM240 thermal-magnetic overcurrent release — the '240' indicates the fixed thermal trip threshold at 25 A, with magnetic short-circuit pickup calibrated to 240 A (approximately 10x In). This is the standard release for general-purpose feeder and branch-circuit protection where adjustable trip isn't required. The interrupting ratings climb to 75.6 kA at 240 V and hold at 52.5 kA at 415 V, then taper to 11.9 kA at 690 V — strong numbers for a 25 A frame, giving good selectivity headroom in most LV distribution schemes. ## Thermal derating and application context At 70 mm deep, 101.6 mm wide, and 130 mm tall, this breaker fits standard Siemens 3VA panel footprints. Power loss is 8.5 W maximum at rated current, which is modest for a 4-pole 25 A frame.","metaTitle":"Siemens 3VA1125-3EF42-0AA0 SENTRON MCCB, 25 A, 4-Pole, TM240","metaDescription":"Siemens SENTRON 3VA1125-3EF42-0AA0 molded case circuit breaker, 25 A rated, 4-pole, TM240 release, 75.6 kA at 240 V. Active production. Available to order — RFQ for pricing and lea","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"70 mm","Width":"101.6 mm","Height":"130 mm","Maximum":"0 A","Minimum":"0 A","at 240 V":"75.6 kA","at 415 V":"52.5 kA","at 440 V":"32 kA","at 500 V":"11.9 kA","at 690 V":"11.9 kA","at 40 °C":"25 A","at 45 °C":"25 A","at 50 °C":"25 A","at 55 °C":"24 A","at 60 °C":"24 A","at 65 °C":"23 A","at 70 °C":"23 A","Depth [In]":"2.76 in","Width [In]":"4 in","Height [In]":"5.12 in","Trip Indicator":"No","Number Of Poles":"4","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":"8.5 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","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","design of the N-conductor protection":"without","Product Function / Grounding Protection":"No","operating voltage / at AC / rated value":"690 V","operating voltage / at DC / rated value":"600 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":"0","Switching Capacity Class Of The Circuit Breaker":"N","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=515127&mlfb=3VA1125-3EF42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1125-3EF42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What are the interrupting ratings for 3VA1125-3EF42-0AA0 at different voltages?","answer":"At 240 V it interrupts 75.6 kA, at 415 V it interrupts 52.5 kA, at 440 V it interrupts 32 kA, and at 500 V and 690 V it interrupts 11.9 kA."},{"question":"What is the thermal derating for this 25 A MCCB at elevated temperatures?","answer":"It holds 25 A from 40 °C to 50 °C, drops to 24 A at 55 °C and 60 °C, and to 23 A at 65 °C and 70 °C."},{"question":"How do I get current pricing and availability for 3VA1125-3EF42-0AA0?","answer":"Submit an RFQ with your target quantity and delivery window — pricing and stock are confirmed at quote time through our sourcing desk."},{"question":"What are the physical dimensions of 3VA1125-3EF42-0AA0?","answer":"It is 70 mm deep, 101.6 mm wide, and 130 mm tall."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1125-3EF42-0AA0","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/3VA1125-3EF42-0AA0 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}}