{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1125-5EF42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1125-5EF42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1125-5EF42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1125-5EF42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1125-5EF42-0AA0, molded case circuit breaker, 4-pole, 25 A rated, TM240 overcurrent release, line protection design, breaking capacity 187 kA at 240 V.","salesMarkdown":"The Siemens 3VA1125-5EF42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 25 A continuous at 40 °C, configured as a 4-pole unit with a TM240 thermal-magnetic overcurrent release. This MCCB's interrupting rating varies by system voltage: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V and 690 V. The drop at higher voltages is typical for a thermal-magnetic breaker — the arc-quenching physics limits the interruptible current as voltage rises. For a 400 V or 480 V distribution panel, the 121 kA or 75.6 kA figure still covers most industrial fault levels. At 690 V, the 17 kA rating is adequate for lower-fault installations like some renewable or marine systems. ## Thermal derating — the real-world current you can carry At 55 °C it derates to 24 A; at 65 °C to 23 A; at 70 °C it still carries 23 A. That means in a warm panel — say 50 °C internal ambient — you can load this breaker to its full 25 A nameplate without derating. Above that, the thermal element in the TM240 release starts to trip earlier, so continuous load should be capped at the derated figure. The maximum power loss is 8.5 W, which is modest for a 4-pole 25 A MCCB and won't drive significant heat into the enclosure. Dimensions: 130 mm height, 101.6 mm width, 70 mm depth. IP40 on the front.","metaTitle":"Siemens 3VA1125-5EF42-0AA0 SENTRON MCCB, 25 A, 4-Pole, 187 k","metaDescription":"Siemens 3VA1125-5EF42-0AA0 SENTRON molded case circuit breaker, 25 A rated, 4-pole, breaking capacity 187 kA at 240 V. Active production. Sourced to order against RFQ.","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":"187 kA","at 415 V":"121 kA","at 440 V":"75.6 kA","at 500 V":"17 kA","at 690 V":"17 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":"M","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=442558&mlfb=3VA1125-5EF42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1125-5EF42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Will 3VA1125-5EF42-0AA0 drop into a panel specified for 3VA1110-5ED32-0AA0?","answer":"The 3VA1125-5EF42-0AA0 is a 4-pole 25 A breaker; the 3VA1110-5ED32-0AA0 is a different variant with its own rating and release. Both share the same SENTRON 3VA mechanical footprint and mounting pattern, so the physical swap is possible, but the interrupting ratings and thermal settings differ — verify the protection coordination before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1125-5EF42-0AA0","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/3VA1125-5EF42-0AA0 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}}