{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA2125-6HN42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA2125-6HN42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA2125-6HN42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA2125-6HN42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA2125-6HN42-0AA0, molded case circuit breaker, 4-pole, 25 A, ETU350 electronic trip unit, 242 kA interrupting at 240 V.","salesMarkdown":"It's a 4-pole unit rated at 25 A continuous with an ETU350 electronic trip unit, so it's handling the feeder or branch circuit in a commercial or industrial switchboard. Insulation voltage is 800 V, which covers 480Y/277 V and 600 V systems with headroom. At 25 A, this breaker is sized for moderate loads — lighting panels, small motor control centers, or downstream subfeeds. The 4-pole configuration means it switches all three phases plus neutral, which you need on a 3-phase 4-wire system where you want to break the neutral as well. The ETU350 trip unit gives you electronic adjustment of the long-time, short-time, instantaneous, and ground-fault pickup — not a fixed thermal-magnetic, so you can dial in coordination with downstream breakers without swapping the whole device. Dimensions are 140 mm wide, 181 mm tall, and 86 mm deep, so it fits standard SENTRON 3VA panel footprints; check your existing bus stack and door clearance before committing the BOM. ## Interrupting capability across voltage levels The interrupting rating drops as voltage climbs: 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. That steep drop at 690 V means this isn't your first choice for 690 V wind farm or mining gear unless the available fault current is under 3.7 kA. For standard 480 V panels (common in North America) the 187 kA at 440 V is the closest proxy, and that's plenty for most utility services. The 242 kA at 240 V is what you need for high-capacity 120/208 V switchboards near a large transformer. ## What you get on the nameplate Power loss is minimal at 0.6 W maximum, so heat buildup in a dense panel isn't a concern. Operating temperature range is -25 °C to 70 °C, with storage from -40 °C to 80 °C. Trip indicator is not fitted, so you'll know it tripped by the load loss or a remote status contact if you add one.","metaTitle":"Siemens 3VA2125-6HN42-0AA0 SENTRON MCCB, 25 A, 4-Pole, 242 k","metaDescription":"Siemens SENTRON 3VA2125-6HN42-0AA0 molded case circuit breaker. 25 A continuous, 4-pole, ETU350 trip unit. Interrupting rating 242 kA at 240 V. Current lifecycle stage. Quoted on r","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":"3VA2125-6HN42-0AA0","Height":"181 mm","Maximum":"300 A","Minimum":"300 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","description":"circuit breaker 3VA2 IEC frame 160 breaking capacity class H Icu=85kA @ 415V 4-pole, line protection ETU350, LSI, In=25A overload protection Ir=10A...25A short-circuit protection Isd=1.5...10 x Ir, Ii=12 x In N conductor protection adjustable (OFF, 100%) nut keeper kit","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":"H","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=306844&mlfb=3VA2125-6HN42-0AA0"},"ai":{"faq":[{"question":"Where can I buy 3VA2125-6HN42-0AA0 and how is it quoted?","answer":"We source and quote this breaker to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or price is displayed here because it varies with volume and market conditions."},{"question":"What is the interrupting rating of 3VA2125-6HN42-0AA0 at 240 V?","answer":"242 kA at 240 V. That's the highest interrupting capacity in the voltage range, dropping to 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V."},{"question":"Does 3VA2125-6HN42-0AA0 have a ground-fault monitoring function?","answer":"No, this version is without ground-fault monitoring. The ETU350 trip unit does support ground-fault pickup if you need it, but the breaker as ordered here doesn't include that function built in."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA2125-6HN42-0AA0","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/3VA2125-6HN42-0AA0 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}}