{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2125-5HN46-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2125-5HN46-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2125-5HN46-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2125-5HN46-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2125-5HN46-0AA0, molded case circuit breaker, 4-pole, 25 A rated continuous current, ETU350 electronic trip unit, breaking capacity 187 kA at 240 V AC.","salesMarkdown":"The Siemens SENTRON 3VA2125-5HN46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 25 A continuous current, with an ETU350 electronic trip unit. Breaking capacity is the headline number here: 187 kA at 240 V AC, 121 kA at 415/440 V, and still 75.6 kA at 500 V. At 690 V the rating drops to 3.7 kA, which is typical for a 4-pole device in a wye configuration — the per-pole voltage stress limits the interrupt rating. ## Thermal performance and continuous rating The 25 A continuous rating holds flat from 40 °C all the way to 70 °C ambient — no derating needed across the normal operating range. That's unusual for a molded case breaker; most lose 10–20 % by 60 °C. The ETU350 electronic trip compensates for ambient temperature, so you don't have to oversize the frame for a warm panel. Power loss is only 0.6 W maximum — negligible for panel heat calculations. The insulation voltage rating is 800 V, so it's comfortable on 480/277 V and 600 V systems with margin. Dimensions are 140 mm wide, 181 mm high, and 86 mm deep. The 140 mm width is standard for a 4-pole SENTRON 3VA2 frame — it occupies the same footprint as other 4-pole breakers in the series, so swapping between ratings in the same panel doesn't require re-drilling the mounting plate. This is standard for panel-mounted MCCBs — the enclosure provides the environmental seal.","metaTitle":"Siemens 3VA2125-5HN46-0AA0 SENTRON MCCB, 25 A, 4-Pole, 187 k","metaDescription":"Siemens SENTRON 3VA2125-5HN46-0AA0 molded case circuit breaker. 25 A continuous, 4-pole, 187 kA breaking at 240 V. ETU350 release. Active production. Quoted to order.","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":"300 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","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":"0.6 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Ground-Fault Monitoring Version":"Without","Continuous Current / Rated Value":"25 A","Insulation Voltage / Rated Value":"800 V","Design Of The Overcurrent Release":"ETU350","protection class IP / on the front":"IP40","design of the N-conductor protection":"adjustable OFF; 100%","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":"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=530773&mlfb=3VA2125-5HN46-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA2125-5HN46-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3VA2125-5HN46-0AA0 at different voltages?","answer":"Breaking capacity is 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. The 690 V figure is the constraint — verify available fault current stays under that."},{"question":"Does 3VA2125-5HN46-0AA0 require derating at high ambient temperatures?","answer":"No derating needed. The 25 A rating holds flat from 40 °C through 70 °C ambient, thanks to the ETU350 electronic trip unit's temperature compensation."},{"question":"Where can I buy 3VA2125-5HN46-0AA0?","answer":"We source and quote this part to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm position."},{"question":"Will 3VA2125-5HN46-0AA0 fit in a panel designed for 3VA2040-8HN42-0AA0?","answer":"Yes, both are 4-pole SENTRON 3VA2 frame breakers with the same 140 mm width, 181 mm height, and 86 mm depth. The footprint is identical — no rewiring or panel modification needed for the swap."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2125-5HN46-0AA0","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/3VA2125-5HN46-0AA0 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}}