{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1225-5FF42-0AH0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1225-5FF42-0AH0","canonicalUrl":"https://aoctrl.com/siemens/3VA1225-5FF42-0AH0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1225-5FF42-0AH0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1225-5FF42-0AH0, molded case circuit breaker, 4-pole, 125 A, TM240 thermal-magnetic release, 187 kA at 240 VAC, 70 mm depth.","salesMarkdown":"Its 187 kA interrupting capacity at 240 VAC gives substantial fault-current headroom for high-available-fault installations, while the 800 V rated insulation voltage suits it for 480Y/277 V and 600 V delta systems where the breaker must withstand line-to-line potentials across open contacts. The interrupting rating drops with system voltage as expected: 187 kA at 240 VAC, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. The TM240 release holds full 250 A rating up to 50 °C ambient (–), then derates linearly to 223 A at 70 °C. Maximum power dissipation is 57 W — relevant for enclosed panel heat calculations, especially when multiple breakers are ganged. The 70 mm depth and 140 mm width fit standard SENTRON mounting footprints; verify busbar and lug kit compatibility for the 125 A frame.","metaTitle":"Siemens 3VA1225-5FF42-0AH0 SENTRON MCCB, 125 A, 4-Pole, 187","metaDescription":"Siemens SENTRON 3VA1225-5FF42-0AH0 molded case circuit breaker, 125 A, 4-pole, 187 kA breaking capacity at 240 VAC. TM240 thermal-magnetic release. Current production. Quoted to or","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":"No","Design Of The Product":"Line protection","Communication Function":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"57 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","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%","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=568716&mlfb=3VA1225-5FF42-0AH0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1225-5FF42-0AH0/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings of this MCCB?","answer":"Rated 125 A continuous, 4-pole, with a TM240 thermal-magnetic release. Interrupting capacity is 187 kA at 240 VAC, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. Rated insulation voltage is 800 V."},{"question":"Where can I buy 3VA1225-5FF42-0AH0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at the time of quote."},{"question":"What is the physical size of this breaker?","answer":"Depth is 70 mm, width is 140 mm, height is 158 mm. These dimensions match the standard SENTRON 3VA molded case breaker footprint."},{"question":"Does this breaker include auxiliary switches?","answer":"Yes, it is equipped with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1225-5FF42-0AH0","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/3VA1225-5FF42-0AH0 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}}