{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1125-4EF32-0KC0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1125-4EF32-0KC0","canonicalUrl":"https://aoctrl.com/siemens/3VA1125-4EF32-0KC0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1125-4EF32-0KC0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1125-4EF32-0KC0, molded case circuit breaker, 3-pole, 25 A (40 °C), 121 kA at 240 V, line protection, with shunt trip and 2 auxiliary switches.","salesMarkdown":"Its 121 kA breaking capacity at 240 V handles high-fault utility feeds; at 415 V it still interrupts 75.6 kA, and at 690 V it holds 11.9 kA — enough for most industrial service-entrance or feeder applications. The 25 A current rating holds flat from 40 °C to 50 °C (–), then derates to 24 A at 55 °C and 23 A at 70 °C (–). The 3-pole frame handles three-phase loads — motor feeders, lighting, or general distribution — and the shunt trip plus two auxiliary switches allow remote tripping and status feedback without an external control relay. Maximum power loss is 8.5 W — low enough that ventilation in a standard IP2X enclosure is adequate. The 70 mm depth, 76.2 mm width, and 130 mm height (–) fit the standard SENTRON 3VA mounting footprint, so it swaps into existing panel layouts without re-drilling. ## Integration notes The shunt trip (STL) requires a separate control voltage — verify polarity and timing per the wiring diagram. The two auxiliary switches (HQ) are pre-installed; they change state with the breaker mechanism, not the handle, so they report true contact position.","metaTitle":"Siemens 3VA1125-4EF32-0KC0 SENTRON MCCB, 25 A, 3-Pole, 121 k","metaDescription":"Siemens SENTRON 3VA1125-4EF32-0KC0 molded case circuit breaker, 25 A rated at 40°C, 3-pole, 121 kA breaking capacity at 240 V. Active production. Sourced 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":"76.2 mm","Height":"130 mm","Maximum":"0 A","Minimum":"0 A","at 240 V":"121 kA","at 415 V":"75.6 kA","at 440 V":"52.5 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]":"3 in","Height [In]":"5.12 in","Trip Indicator":"No","Number Of Poles":"3","Voltage Trigger":"Yes","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","Of The Supplied Basic Switch":"3VA11254EF320AA0","Design Of The Auxiliary Switch":"2 auxiliary switches HQ","Design Of The Auxiliary Release":"shunt trip (STL)","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","Of The Integrated Auxiliary Trip Unit":"3VA9688-0BL33","Product Function / Grounding Protection":"No","operating voltage / at AC / rated value":"690 V","operating voltage / at DC / rated value":"500 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":"2","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AA12","Switching Capacity Class Of The Circuit Breaker":"S","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=59682&mlfb=3VA1125-4EF32-0KC0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1125-4EF32-0KC0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of this MCCB at different voltages?","answer":"121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V (–)."},{"question":"Where can I buy 3VA1125-4EF32-0KC0 and get a price?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1125-4EF32-0KC0","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/3VA1125-4EF32-0KC0 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}}