{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1225-4GF42-0BH0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1225-4GF42-0BH0","canonicalUrl":"https://aoctrl.com/siemens/3VA1225-4GF42-0BH0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1225-4GF42-0BH0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1225-4GF42-0BH0, molded case circuit breaker, 4-pole, 250 A rated continuous current (Iu), TM240 thermal-magnetic release, line protection, 121 kA breaking capacity at 240 V, undervoltage release, IP40 front.","salesMarkdown":"It carries a 121 kA breaking capacity at 240 V, 75.6 kA at 415 V, and 25 kA at 440 V — numbers that tell you it can sit upstream of a big distribution panel or a motor control center and still hold coordination with downstream breakers. That matters for a procurement decision: if your BOM calls for a 250 A frame with a 240 A thermal pickup, this is a direct fit. The 4-pole construction handles three-phase plus neutral, with 100% N-conductor protection rated. At 240 V it's rated 121 kA; at 415 V it drops to 75.6 kA; at 440 V it's 25 kA; at 690 V it's 11.9 kA. These are symmetrical RMS values. ## Thermal derating — what the ambient temperature curve tells you At 55 °C it derates to 243.3 A, at 60 °C to 236.5 A, at 65 °C to 229 A, and at 70 °C to 223 A. That's a gentle slope — about 1% per 5 °C above 50 °C. For a panel OEM wireman packing breakers into a closed cabinet, this means you can run it at full 250 A in a ventilated 50 °C enclosure without oversizing the frame. In a hot pump house or near a furnace, you'll need to account for the derate or bump up to the next frame. ## Physical fit and auxiliary wiring Dimensions are 158 mm high, 140 mm wide, 70 mm deep — a compact 4-pole footprint that fits standard Siemens 3VA panel cutouts and busbar systems. The auxiliary contacts provide status feedback for PLC inputs or remote indication.","metaTitle":"Siemens 3VA1225-4GF42-0BH0 SENTRON MCCB, 250 A, 4-Pole, 121","metaDescription":"Siemens SENTRON 3VA1225-4GF42-0BH0 molded case circuit breaker, 250 A rated current, 4-pole, 121 kA breaking capacity at 240 V. Current lifecycle stage, sourced to order. Request a","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","at 240 V":"121 kA","at 415 V":"75.6 kA","at 440 V":"25 kA","at 690 V":"11.9 kA","at 40 °C":"250 A","at 45 °C":"250 A","at 50 °C":"250 A","at 55 °C":"243.3 A","at 60 °C":"236.5 A","at 65 °C":"229 A","at 70 °C":"223 A","Trip indicator":"Yes","Number of poles":"4","Product version":"Line protection","Voltage trigger":"No","lifecycle_stage":"current","Product brand name":"SENTRON","Product designation":"Molded case circuit breaker","Latching - endurance":"15 000","Undervoltage Release":"Yes","Communication Function":"No","Phase failure detection":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","Auxiliary contact version":"2 auxiliary switches + 1 trip alarm switch HQ","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Rated continuous current Iu":"250 A","Rated insulation voltage Ui":"800 V","Design of the auxiliary release":"Undervoltage release (UVR)","Ground fault monitoring version":"Without","Of The Integrated Auxiliary Trip":"3VA9608-0BB11","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%","Reference code / acc. to DIN EN 81346-2":"Q","Adjustable response value time / tr max.":"1","Adjustable response value time / tr min.":"1","Max. rated operational voltage Ue with DC":"600 V","Undervoltage Release With Leading Contact":"No","Product extension / optional / motor drive":"Yes","Adjustable response value current / Ir max.":"250 A","Adjustable response value current / li max.":"2 500 A","Adjustable response value current / li min.":"1 250 A","Adjustable response value current / lr min.":"175 A","Neutral conductors / upgradeable/retrofittable":"No","Number of CO contacts / for auxiliary contacts":"3","Protective function of the overcurrent release":"LI","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AB12","Switching capacity class of the circuit breaker":"S","Max. rated operational current of the frame size":"250 A","Max. rated operational voltage Ue with AC 50/60Hz":"690 V","Type of electrical connection / for main current circuit":"lug terminal","Arrangement of electrical connectors / for main current circuit":"Front terminal","Type of connectable conductor cross-section, connection screw, width x thickness , max.":"25 x 8","Type of connectable conductor cross-section, connection screw, width x thickness , min.":"13 x 1"}},"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=568542&mlfb=3VA1225-4GF42-0BH0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1225-4GF42-0BH0/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3VA1225-4GF42-0BH0?","answer":"Pricing and stock levels are confirmed at quote time. Submit an RFQ through this listing; we source through independent distribution channels and will return a firm price and lead time for your quantity."},{"question":"What is 3VA1225-4GF42-0BH0's depth?","answer":"The depth is 70 mm, with a width of 140 mm and height of 158 mm. Fits standard 3VA panel cutouts."},{"question":"What breaking capacity does this MCCB have at common industrial voltages?","answer":"At 240 V it interrupts 121 kA; at 415 V, 75.6 kA; at 440 V, 25 kA; at 690 V, 11.9 kA. The 415 V figure is the one that governs in 400 V distribution."},{"question":"What compliance documentation is available for 3VA1225-4GF42-0BH0?","answer":"As a Siemens SENTRON product, this MCCB carries the standard industrial certifications: UL 489, CSA C22.2 No. 5, IEC 60947-2, and CE marking. RoHS and REACH declarations are available from Siemens' documentation portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1225-4GF42-0BH0","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/3VA1225-4GF42-0BH0 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}}