{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1225-1AA42-0CA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1225-1AA42-0CA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1225-1AA42-0CA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1225-1AA42-0CA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1225-1AA42-0CA0, switch disconnector in MCCB design, IEC frame 250, 4-pole, In=250 A, without overload or short-circuit protection, undervoltage release (UVR) 120-127 V AC 50/60 Hz, busbar connection front terminal.","salesMarkdown":"It is not a circuit breaker — it carries no overload or short-circuit protection elements. Its job is load-break isolation: safe manual switching under load, with visible contact position, for maintenance or emergency disconnection. Rated insulation voltage Ui is 800 V, with maximum operational voltage 690 V AC (50/60 Hz) and 600 V DC. That DC rating is notable — many switch disconnectors in this frame size top out lower. If your circuit runs DC bus voltages up to 600 V, this part stays within its rated envelope. ## The Undervoltage Release — Critical for Safety Chains In a safety circuit, the UVR coil drops the disconnector open when control voltage is lost — intentional (E-stop) or unintentional (brownout). That makes this part a natural fit for emergency-off strings where you want the disconnector to track the safety relay state without a separate shunt trip and control wiring. The UVR does not include a leading contact. That means the disconnector opens immediately on voltage loss — no delayed dropout for sequenced shutdown. Verify your control scheme tolerates instantaneous opening under fault conditions. Dimensions: 158 mm height, 140 mm width, 70 mm depth. The 140 mm width matches the standard 4-pole MCCB footprint in the SENTRON 3VA platform — same panel cutout as a 4-pole 3VA2 breaker. Depth at 70 mm is shallow enough for most distribution boards; verify clearance for busbar connections at the front terminals. Main circuit connection is busbar connection via front terminals. No lug terminals on this variant — you need busbar adapters or a compatible busbar system. The part accepts optional motor drive for remote switching, though it ships without one. That is the heat you must dissipate inside the enclosure at full load. For a 250 A disconnector in a sealed panel, factor this into your thermal budget — especially if the disconnector shares a compartment with other heat-generating components. ## Limited Short-Time Rating — Know the Constraint The switch disconnector carries a limited short-time withstand rating of 3 kA for both 0.5 s and 1 s. That is not a breaking capacity — it is the fault current the closed disconnector can endure without welding or damage while an upstream protective device clears the fault. For systems with available fault current above 3 kA, you need upstream current-limiting fuses or a breaker that clears faster than the disconnector's withstand time.","metaTitle":"Siemens 3VA1225-1AA42-0CA0 SENTRON Switch Disconnector, 250","metaDescription":"Siemens SENTRON 3VA1225-1AA42-0CA0 switch disconnector, 250 A rated continuous current, 4-pole, undervoltage release 120-127 VAC. Current lifecycle stage. Sourced to order against","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","Limited To 1 S":"3 kA","Trip indicator":"No","Number of poles":"4","Product version":"in MCCB design","Voltage trigger":"No","lifecycle_stage":"current","Limited To 0.5 S":"3 kA","Product brand name":"SENTRON","Product designation":"Switch disconnector","Latching - endurance":"15 000","Undervoltage Release":"Yes","Communication Function":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","Power loss [W] / maximum":"57 W","Auxiliary contact version":"Without","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Rated continuous current Iu":"250 A","Rated insulation voltage Ui":"800 V","Design of the auxiliary release":"Undervoltage release (UVR)","Protection class IP / on the front":"IP40","Reference code / acc. to DIN EN 81346-2":"Q","Max. rated operational voltage Ue with DC":"600 V","Undervoltage Release With Leading Contact":"No","Product extension / optional / motor drive":"Yes","Number of CO contacts / for auxiliary contacts":"0","Max. rated operational voltage Ue with AC 50/60Hz":"690 V","Type of electrical connection / for main current circuit":"busbar connection","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=569276&mlfb=3VA1225-1AA42-0CA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1225-1AA42-0CA0/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3VA1225-1AA42-0CA0?","answer":"This part is sourced through independent distribution and quoted to order against an RFQ. Pricing and availability are confirmed at quote time — submit an inquiry for a current quote."},{"question":"Will 3VA1225-1AA42-0CA0 drop into a panel specified around 3VA1112-5EF32-0CA0 without rewiring?","answer":"No — the two parts have different physical footprints and connection types. The 3VA1225-1AA42-0CA0 is 140 mm wide with busbar front terminals; the 3VA1112-5EF32-0CA0 is 76.2 mm wide with lug terminals. Panel cutouts, busbar systems, and wiring would all need rework."},{"question":"What is the 3VA1225-1AA42-0CA0's depth?","answer":"Depth is 70 mm. Width is 140 mm; height is 158 mm."},{"question":"What compliance documentation does this part carry?","answer":"The evidence does not list specific compliance marks (UL, CSA, CE, RoHS, REACH) for this order code. Standard Siemens SENTRON switch disconnectors typically carry IEC 60947-3 certification; verify the specific documentation package with your Siemens representative or distributor at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1225-1AA42-0CA0","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/3VA1225-1AA42-0CA0 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}}