{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1225-5GF42-0AG0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1225-5GF42-0AG0","canonicalUrl":"https://aoctrl.com/siemens/3VA1225-5GF42-0AG0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1225-5GF42-0AG0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON molded case circuit breaker, 3VA1225-5GF42-0AG0, 250 A, 4-pole, TM240 thermal-magnetic release, 187 kA breaking capacity at 240 V.","salesMarkdown":"It's built for line protection — main feeder or large subfeed in a distribution panel, not motor-starting duty. The frame is rated 800 V insulation voltage, so it handles 480Y/277 V or 600 V delta systems without derating the insulation. Power loss runs 57 W max at full load — that's the heat the enclosure has to vent. It carries a built-in auxiliary switch plus a separate trip-alarm switch, so the PLC or BMS gets a discrete signal when the breaker trips on fault — no add-on module needed for that. ## Breaking capacity — the real SCCR story This MCCB clears 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. At 480 V (common US industrial distribution), the curve lands between the 415 V and 440 V figures — roughly 100 kA class. ## Thermal derating — don't size it by the label alone Rated 250 A continuous at 40 °C, 45 °C, and 50 °C — no derating needed up to 50 °C ambient inside the enclosure. At 55 °C it's 243 A, at 60 °C it's 237 A, at 65 °C it's 230 A, and at 70 °C it's 223 A. If the panel sits in a hot mezzanine or near a furnace line, the 70 °C figure (223 A) is the one to use for sizing. ## Fit in the panel — dimensions and mounting Footprint: 140 mm wide, 158 mm tall, 70 mm deep. That's a 4-pole frame in the 3VA platform — wider than a 3-pole, so check the existing DIN-rail or mounting-plate layout before you swap. Depth of 70 mm (2.76 in) means it fits standard 600 mm deep enclosures with clearance for rear-connected busbars or cable lugs. The wireman needs access to the front terminals and the TM dial — no side-access required.","metaTitle":"Siemens 3VA1225-5GF42-0AG0 MCCB, 250 A, 4-Pole, 187 kA at 24","metaDescription":"Siemens SENTRON 3VA1225-5GF42-0AG0 molded case circuit breaker, 250 A, 4-pole, TM240 release, 187 kA at 240 V. Current lifecycle. 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":"250 A","Minimum":"250 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":"3VA12255GF420AA0","Design Of The Auxiliary Switch":"1 auxiliary switch + 1 trip alarm switch HP","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":"100%","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":"2","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AB11","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=568741&mlfb=3VA1225-5GF42-0AG0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1225-5GF42-0AG0/alternatives.json"},"ai":{"faq":[{"question":"Who supplies 3VA1225-5GF42-0AG0 and how is it quoted?","answer":"This part is sourced through independent industrial-automation distribution channels. It is quoted to order against an RFQ — send the order code and quantity for a current price and availability check."},{"question":"What is the breaking capacity of 3VA1225-5GF42-0AG0 at 480 V?","answer":"The interrupting capacity at 415 V is 121 kA and at 440 V it is 75.6 kA. At 480 V (common US distribution) the value falls between those two figures — approximately 100 kA class, sufficient for most secondary-side service entrance applications without upstream current-limiting fuses."},{"question":"Does 3VA1225-5GF42-0AG0 include auxiliary contacts?","answer":"Yes — it ships with one auxiliary switch and one trip-alarm switch built in. That gives a normally-open/normally-closed position signal and a separate fault-indication contact without requiring an add-on module."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1225-5GF42-0AG0","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/3VA1225-5GF42-0AG0 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}}