{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2125-6KP46-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2125-6KP46-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2125-6KP46-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2125-6KP46-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2125-6KP46-0AA0, molded case circuit breaker, 4-pole, 25 A continuous rating, ETU850 electronic trip unit, breaking capacity 242 kA at 240 V.","salesMarkdown":"## SENTRON 3VA2125-6KP46-0AA0 — line-protection MCCB with ETU850 trip unit The Siemens SENTRON 3VA2125-6KP46-0AA0 is a 4-pole molded case circuit breaker (MCCB) designed for line protection, carrying a continuous current rating of 25 A and fitted with the ETU850 electronic overcurrent release. The ETU850 provides adjustable trip curves and integrated communication and measurement functions, making it suitable for selective coordination in distribution panels where remote monitoring and fault diagnostics are required. The 242 kA breaking capacity at 240 V (187 kA at 415 V) means it can safely interrupt very high fault currents typical of large transformer-fed switchboards without upstream cascading — a critical spec for main or tie-breaker positions in industrial low-voltage distribution. ## Breaking capacity and voltage-dependent performance The interrupting rating drops sharply at higher voltages: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V. The 690 V figure is a hard limit — this MCCB is not intended for 690 V main feeders with high available fault current; it fits 400 V-class systems where the full 187 kA rating provides generous headroom for most industrial installations. The 25 A continuous rating is thermally stable across the full operating range (-25 °C to 70 °C), with no derating needed up to 70 °C ambient. Dimensions: 140 mm wide, 181 mm tall, 86 mm deep. IP40 front protection. Power loss is 0.6 W maximum.","metaTitle":"Siemens 3VA2125-6KP46-0AA0 SENTRON MCCB, 25 A, 4-Pole, ETU85","metaDescription":"Siemens SENTRON 3VA2125-6KP46-0AA0 molded case circuit breaker, 25 A continuous, 4-pole, ETU850 electronic trip unit. Breaking capacity 242 kA at 240 V. Current lifecycle stage. Qu","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"86 mm","Width":"140 mm","Height":"181 mm","Maximum":"300 A","Minimum":"38 A","at 240 V":"242 kA","at 415 V":"187 kA","at 440 V":"187 kA","at 500 V":"121 kA","at 690 V":"3.7 kA","at 40 °C":"25 A","at 45 °C":"25 A","at 50 °C":"25 A","at 55 °C":"25 A","at 60 °C":"25 A","at 65 °C":"25 A","at 70 °C":"25 A","Depth [In]":"3.39 in","Width [In]":"5.51 in","Height [In]":"7.13 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":"Yes","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"0.6 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"Yes","Ground-Fault Monitoring Version":"Without","Continuous Current / Rated Value":"25 A","Insulation Voltage / Rated Value":"800 V","Design Of The Overcurrent Release":"ETU850","protection class IP / on the front":"IP40","design of the N-conductor protection":"adjustable OFF; 40% to 160%","Product Function / Grounding Protection":"No","operating voltage / at AC / rated value":"690 V","reference code / according to IEC 81346-2":"Q","Continuous Current / Rated Value / Maximum":"160 A","Product Extension / Optional / Motor Drive":"Yes","Protection Function Of The Overcurrent Release":"LSI","number of CO contacts / for auxiliary contacts":"0","Switching Capacity Class Of The Circuit Breaker":"H","Mechanical Service Life (Operating Cycles) / Typical":"25 000","Type Of Electrical Connection / For Main Current Circuit":"double-sided box terminal","Arrangement Of Electrical Connectors / For Main Current Circuit":"Front terminal"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/641a6843e8dc2f758bb6426196efa871.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=520367&mlfb=3VA2125-6KP46-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2125-6KP46-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Will 3VA2125-6KP46-0AA0 fit in a panel designed for 3VA2125-8KQ42-0AA0?","answer":"Yes, both are 4-pole SENTRON 3VA2 frame-size MCCBs with identical dimensions (140 mm wide, 181 mm tall, 86 mm deep), so they share the same mounting footprint and bus-bar spacing. The difference is in the trip unit and accessories — verify the ETU850 settings and communication/measurement functions match your application before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2125-6KP46-0AA0","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/3VA2125-6KP46-0AA0 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}}