{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1225-5FF42-0BH0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1225-5FF42-0BH0","canonicalUrl":"https://aoctrl.com/siemens/3VA1225-5FF42-0BH0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1225-5FF42-0BH0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1225-5FF42-0BH0, molded case circuit breaker, 4-pole, 125 A, breaking capacity 187 kA at 240 V AC, line protection design.","salesMarkdown":"This MCCB delivers 187 kA interrupting capacity at 240 V AC, dropping to 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. These are high-interrupting ratings for a 125 A frame — useful where fault current is high (close to a transformer) and you need selectivity without stepping up to a larger breaker. The 690 V figure (17 kA) is the weakest point: if your system runs at 690 V and available fault current exceeds that, this breaker won't hold. Check the point-of-common-coupling SCCR before specifying. ## Thermal derating Rated 250 A at 40, 45, and 50 °C ambient — that's the continuous current the breaker's thermal-magnetic trip can carry without nuisance tripping. At 55 °C it derates to 243 A, at 60 °C to 237 A, at 65 °C to 230 A, and at 70 °C to 223 A. The UVR means the breaker drops out if control voltage is lost — typical for emergency-stop or undervoltage protection schemes. Dimensions: 70 mm deep, 140 mm wide, 158 mm high. The 140 mm width is the key fit dimension: if your panel was laid out for a narrower 3-pole breaker, this 4-pole won't fit without a wider slot. The trip indicator (mechanical flag) is visible through the front cover, so you can see a trip at a glance without opening the door.","metaTitle":"Siemens 3VA1225-5FF42-0BH0 SENTRON MCCB, 125 A, 4-Pole, 187","metaDescription":"Siemens SENTRON 3VA1225-5FF42-0BH0 molded case circuit breaker, 125 A, 4-pole, breaking capacity 187 kA at 240 V. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"70 mm","Width":"140 mm","Height":"158 mm","Maximum":"125 A","Minimum":"125 A","at 240 V":"187 kA","at 415 V":"121 kA","at 440 V":"75.6 kA","at 500 V":"30 kA","at 690 V":"17 kA","at 40 °C":"250 A","at 45 °C":"250 A","at 50 °C":"250 A","at 55 °C":"243 A","at 60 °C":"237 A","at 65 °C":"230 A","at 70 °C":"223 A","Depth [In]":"2.76 in","Width [In]":"5.51 in","Height [In]":"6.22 in","Trip Indicator":"Yes","Number Of Poles":"4","Voltage Trigger":"No","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Molded case circuit breaker","Undervoltage Release":"Yes","Design Of The Product":"Line protection","Communication Function":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"59.5 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Of The Supplied Basic Switch":"3VA12255FF420AA0","Design Of The Auxiliary Switch":"2 auxiliary switches + 1 trip alarm switch HQ","Design Of The Auxiliary Release":"undervoltage release (UVR)","Ground-Fault Monitoring Version":"Without","Insulation Voltage / Rated Value":"800 V","Design Of The Overcurrent Release":"TM240","Design Of Short-Circuit Protection":"For switching power values in DC networks, see the 3VA molded case circuit breaker device manual; link to be found under Service & Support in the last chapter","protection class IP / on the front":"IP40","design of the N-conductor protection":"50%","Of The Integrated Auxiliary Trip Unit":"3VA9608-0BB11","Product Function / Grounding Protection":"No","operating voltage / at AC / rated value":"690 V","operating voltage / at DC / rated value":"600 V","reference code / according to IEC 81346-2":"Q","Product Extension / Optional / Motor Drive":"Yes","Protection Function Of The Overcurrent Release":"LI","number of CO contacts / for auxiliary contacts":"3","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AB12","Switching Capacity Class Of The Circuit Breaker":"M","Mechanical Service Life (Operating Cycles) / Typical":"20 000","Type Of Electrical Connection / For Main Current Circuit":"nut keeper kit on both ends","Arrangement Of Electrical Connectors / For Main Current Circuit":"Front terminal"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=568720&mlfb=3VA1225-5FF42-0BH0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1225-5FF42-0BH0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3VA1225-5FF42-0BH0 at 415 V?","answer":"The breaking capacity is 121 kA at 415 V AC. At 240 V it is 187 kA, at 440 V it is 75.6 kA, at 500 V it is 30 kA, and at 690 V it is 17 kA."},{"question":"Does this MCCB include an undervoltage release?","answer":"Yes, it is factory-fitted with an undervoltage release (UVR), plus two auxiliary switches and one trip alarm switch (HQ)."},{"question":"Where can I buy 3VA1225-5FF42-0BH0 and get current pricing?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1225-5FF42-0BH0","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/3VA1225-5FF42-0BH0 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}}