{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1225-1AA32-0KH0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1225-1AA32-0KH0","canonicalUrl":"https://aoctrl.com/siemens/3VA1225-1AA32-0KH0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1225-1AA32-0KH0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1225-1AA32-0KH0, switch disconnector IEC frame 250, 3-pole, In=250 A, without overload or short-circuit protection, shunt trip STL 220-250 V DC / 208-277 V AC, 2 HQ auxiliary switches + 1 HQ trip alarm switch, busbar connection front terminal.","salesMarkdown":"## What this 3VA1 frame 250 switch disconnector is — and isn't The Siemens SENTRON 3VA1225-1AA32-0KH0 is a 3-pole switch disconnector in an MCCB-style housing, rated 250 A continuously at 40 °C through 50 °C without derating — it holds full current right up to that ambient. Above 50 °C the thermal curve steps down: 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, 223 A at 70 °C. That's a clean, published derating ladder you can build into your panel thermal budget. Critical distinction: this is a switch disconnector, not a molded case circuit breaker. It has no overload or short-circuit protection — no trip curve, no magnetic or thermal-magnetic element. It's a load-break disconnect rated for isolation, intended to be paired with upstream protection (fuses or an MCCB). The shunt trip (STL) coil accepts 220-250 V DC or 208-277 V AC, giving you remote trip capability for emergency-off or process interlock circuits. The auxiliary contact block carries 2 HQ auxiliary switches plus 1 HQ trip alarm switch — that's three CO contacts total. The trip alarm signals when the disconnect has opened, whether by manual handle or shunt trip, so a PLC or safety relay gets a positive feedback wire. ## Panel fit and connection Footprint is 105 mm wide × 158 mm high × 70 mm deep — the 105 mm width is three 35 mm DIN modules side by side, so it occupies the same panel real estate as a 3-pole MCCB in the same frame. Front terminals accept busbar connection for the main circuit; the busbar kit with nut keepers is included (the 'nut keeper kit' in the description). The IP40 front face keeps finger-safe touch protection in a clean indoor panel. For a 250 A disconnect running continuously, factor that into your thermal calculation; it's roughly equivalent to a 60 W incandescent lamp running inside the panel. The 70 mm depth is shallower than the 86 mm of the 3VA2 frame peer — that 16 mm difference can matter in a tight backpanel or gland-plate clearance. The 3VA1 frame 250 is the disconnect-only variant of the 3VA2 frame 250 MCCB. If your BOM originally called for a 3VA2225-5JQ32-0AK0 (an MCCB with ETU560 electronic trip unit, communication function, and LSIG protection), this 3VA1225-1AA32-0KH0 will not drop in as a direct replacement — it lacks the overcurrent protection and communication entirely. But the footprint and terminal arrangement are similar enough that a panel designed for the 3VA2 frame can often accept the 3VA1 disconnect with a busbar kit change and a different depth allowance (70 mm vs 86 mm). Verify the protection scheme upstream before swapping. That 800 V Ui means the internal clearances and creepage are designed for 800 V systems — it's not just a 690 V part with a higher label. Mechanical service life is 15 000 operating cycles typical. That's a disconnect, not a contactor — it's not meant for frequent switching. For a line disconnect operated a few times per shift, that life is fine. If you need daily cycling under load, look at a contactor or a motor-rated switch instead. The shunt trip (STL) is a separate auxiliary release — not an undervoltage release. It trips on application of voltage, not on loss of voltage. If your safety circuit requires a drop-out on power loss, you need an undervoltage release (UVR), which this unit does not carry (listed as 'Undervoltage Release: No'). The STL is for remote pushbutton or PLC-initiated trip only.","metaTitle":"Siemens 3VA1225-1AA32-0KH0 SENTRON Switch Disconnector, 250","metaDescription":"Siemens SENTRON 3VA1225-1AA32-0KH0 switch disconnector, 250 A rated, 3-pole, shunt trip STL, 2 aux switches + trip alarm. Active production. 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":"105 mm","Height":"158 mm","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","Trip Indicator":"Yes","Number Of Poles":"3","Voltage Trigger":"Yes","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Switch disconnector","Undervoltage Release":"No","Design Of The Product":"in MCCB design","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","Design Of The Auxiliary Switch":"2 auxiliary switches + 1 trip alarm switch HQ","Design Of The Auxiliary Release":"Shunt trip (STL)","Insulation Voltage / Rated Value":"800 V","protection class IP / on the front":"IP40","operating voltage / at AC / rated value":"690 V","operating voltage / at DC / rated value":"500 V","Product Function / Communication Function":"No","Undervoltage Release With Leading Contact":"No","reference code / according to IEC 81346-2":"Q","Product Extension / Optional / Motor Drive":"Yes","number of CO contacts / for auxiliary contacts":"3","Mechanical Service Life (Operating Cycles) / Typical":"15 000","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=569263&mlfb=3VA1225-1AA32-0KH0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1225-1AA32-0KH0/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions for panel layout?","answer":"Width 105 mm, height 158 mm, depth 70 mm. The width matches three 35 mm DIN modules. Front terminals accept busbar connection; IP40 front face."},{"question":"Can I buy 3VA1225-1AA32-0KH0 and what is the lead time?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm lead time."},{"question":"Does 3VA1225-1AA32-0KH0 have overcurrent protection?","answer":"No. It is a switch disconnector without overload or short-circuit protection. It must be paired with upstream fuses or an MCCB for fault protection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1225-1AA32-0KH0","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/3VA1225-1AA32-0KH0 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}}