{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2125-5KQ46-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2125-5KQ46-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2125-5KQ46-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2125-5KQ46-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2125-5KQ46-0AA0, molded case circuit breaker, 4-pole, 25 A continuous, 187 kA interrupting at 240 V, line protection with ground-fault monitoring.","salesMarkdown":"The interrupting curve drops to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 3.7 kA at 690 V — still enough for most industrial service entrances, but worth checking if you're on a 690 V corner-grounded delta. ## Ground-fault monitoring and communication This MCCB includes ground-fault monitoring using summation current formation on L + N conductors — it sums the phase and neutral currents; any imbalance beyond the trip threshold signals a ground leak. That's a built-in GF protection layer without needing a separate relay module, which simplifies wiring in panels feeding sensitive loads or wet-area circuits. The breaker also has a communication function, so it can report status and trip events to a PLC or BMS over the plant network — useful for remote monitoring on a production line where you need to know which breaker opened without walking the panel. ## Thermal performance and panel fit That's unusual; many MCCBs start pulling back above 40 °C. The power loss is only 0.6 W maximum, so heat buildup inside a crowded enclosure isn't a concern. The 140 mm width for a 4-pole breaker is typical; check your existing busbar spacing if you're retrofitting into an older panel.","metaTitle":"Siemens 3VA2125-5KQ46-0AA0 SENTRON MCCB, 25 A, 4-Pole, 187 k","metaDescription":"Siemens SENTRON 3VA2125-5KQ46-0AA0 molded case circuit breaker, 25 A continuous, 4-pole, 187 kA interrupting at 240 V. Line protection with ground-fault monitoring. Active producti","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":"187 kA","at 415 V":"121 kA","at 440 V":"121 kA","at 500 V":"75.6 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","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":"0.6 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":"M","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=527276&mlfb=3VA2125-5KQ46-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2125-5KQ46-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Does this breaker include ground-fault protection?","answer":"Yes, it has ground-fault monitoring using summation current formation on L + N conductors — it detects leakage current by measuring imbalance between phase and neutral."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2125-5KQ46-0AA0","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/3VA2125-5KQ46-0AA0 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}}