{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1225-5FF42-0CA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1225-5FF42-0CA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1225-5FF42-0CA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1225-5FF42-0CA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1225-5FF42-0CA0, molded case circuit breaker, 4-pole, 125 A, TM240 thermal-magnetic release, undervoltage release, 70 mm depth.","salesMarkdown":"## Rated current and breaking capacity Its breaking capacity steps with system voltage: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V — so the available fault current at the panel's service entrance determines which voltage column governs the selection. ## Thermal derating and power loss Above that, derating is gradual: 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. Maximum power loss is 59.5 W — a figure to budget for in enclosed panels where heat rise stacks across multiple devices. ## Undervoltage release and auxiliary options The base switch is 3VA12255FF420AA0; no communication function or ground-fault monitoring is fitted on this order code. ## Environmental and insulation ratings The storage minimum of -40 °C covers cold warehouse or unheated site storage before installation.","metaTitle":"Siemens 3VA1225-5FF42-0CA0 SENTRON MCCB, 125 A, 4-Pole, 70 m","metaDescription":"Siemens 3VA1225-5FF42-0CA0 SENTRON molded case circuit breaker, 125 A rated, 4-pole, TM240 release, 187 kA at 240 V. Current-production status. Available to order against RFQ.","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":"No","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 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":"3VA9608-0BB24","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":"0","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=568721&mlfb=3VA1225-5FF42-0CA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1225-5FF42-0CA0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3VA1225-5FF42-0CA0 at 415 V?","answer":"At 415 V the breaking capacity is 121 kA. At 240 V it is 187 kA, and it decreases at higher voltages: 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V."},{"question":"Where can I buy 3VA1225-5FF42-0CA0?","answer":"This part is sourced to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commitment."},{"question":"Does 3VA1225-5FF42-0CA0 include an undervoltage release?","answer":"Yes, it is fitted with an undervoltage release (UVR) as the auxiliary release type. No ground-fault monitoring or communication module is included on this variant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1225-5FF42-0CA0","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/3VA1225-5FF42-0CA0 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}}