{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2125-0KQ42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2125-0KQ42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2125-0KQ42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2125-0KQ42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2125-0KQ42-0AA0, molded case circuit breaker, 4-pole, 25 A continuous, ETU860 electronic trip unit, 440 kA breaking capacity at 415 V.","salesMarkdown":"Its adjustable trip range spans 38 A minimum to 300 A maximum, so the same frame can be tuned to protect a 40 A feeder or a 250 A main — the 25 A continuous rating is the thermal baseline the breaker is calibrated to carry indefinitely without tripping at 40 °C ambient. Breaking capacity is 440 kA at 415 V and 187 kA at 690 V, which means it can safely interrupt fault currents up to those levels without cascading upstream — relevant for high-fault-capacity industrial switchboards where a standard 50 kA MCCB would need a current-limiting fuse ahead of it. The ETU860 release supports communication, ground-fault monitoring via summation current formation on L+N, and adjustable N-conductor protection from OFF through 40% to 160% of the phase setting. That makes it suitable for 4-wire systems where neutral protection must be coordinated with the phase trip. The 140 mm width on a 4-pole MCCB is standard for a 160 A frame — it occupies three 45 mm module spaces plus one 50 mm space on a DIN rail or bolts directly to a mounting plate. For a BOM freeze or second-source gate: the closest functional peer within the same SENTRON family is the 5SQ2670-2YA63, which also carries an ETU860 release and similar frame size. The 3VA2125-0KQ42-0AA0 is the standard catalog variant; the 5SQ prefix typically denotes a configured or project-specific order code. If your panel was built around a 5SQ2670-2YA63, the 3VA2125-0KQ42-0AA0 will drop into the same footprint and wiring — same pole count, same release family, same mounting dimensions — but verify the configured trip settings on the 5SQ part match your coordination study before swapping.","metaTitle":"Siemens 3VA2125-0KQ42-0AA0 SENTRON MCCB, 25 A, 4-Pole, 440 k","metaDescription":"Siemens SENTRON 3VA2125-0KQ42-0AA0 molded case circuit breaker. 25 A continuous, 4-pole, ETU860 release. Breaking capacity 440 kA at 415 V. Current lifecycle stage. Available to or","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","title":"3VA2125-0KQ42-0AA0","Height":"181 mm","Maximum":"300 A","Minimum":"38 A","at 415 V":"440 kA","at 690 V":"187 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","description":"circuit breaker 3VA2 IEC frame 160 breaking capacity class E Icu=200 kA @ 415 V 4-pole, line protection ETU860, LSIG, In=25A overload protection Ir=10A... 25A short circuit protection Isd=0,6...10xIn, Ii=1,5...12xIn neutral protection adjustable(OFF up to 160%) busbar connection","Initial Value":"15 A","Trip Indicator":"No","Number Of Poles":"4","Voltage Trigger":"No","lifecycle_stage":"current","Full-Scale Value":"25 A","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":"0.5 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"Yes","Ground-Fault Monitoring Version":"Summation current formation L + N conductor","Continuous Current / Rated Value":"25 A","Insulation Voltage / Rated Value":"800 V","Design Of The Overcurrent Release":"ETU860","protection class IP / on the front":"IP40","design of the N-conductor protection":"adjustable OFF; 40% to 160%","Product Function / Grounding Protection":"Yes","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":"LSIG","number of CO contacts / for auxiliary contacts":"0","Switching Capacity Class Of The Circuit Breaker":"E","Mechanical Service Life (Operating Cycles) / Typical":"25 000","Type Of Electrical Connection / For Main Current Circuit":"on both sides nut keeper kit","Arrangement Of Electrical Connectors / For Main Current Circuit":"Front terminal"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"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=1417766&mlfb=3VA2125-0KQ42-0AA0"},"ai":{"faq":[{"question":"Will 3VA2125-0KQ42-0AA0 fit in a panel designed for 5SQ2670-2YA63?","answer":"Yes — same 4-pole count, same ETU860 release family, same mounting dimensions (181 x 140 x 86 mm). The 3VA prefix is the standard catalog variant; the 5SQ prefix is typically a configured order code. Verify the configured trip settings on the 5SQ part match your coordination study before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2125-0KQ42-0AA0","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/3VA2125-0KQ42-0AA0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}