{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG3081-1AK20","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG3081-1AK20","canonicalUrl":"https://aoctrl.com/siemens/3UG3081-1AK20","factsUrl":"https://aoctrl.com/api/mcp/products/3UG3081-1AK20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS insulation monitor, 3UG3081-1AK20, for ungrounded AC IT networks, supply AC 110/230 V, 1 CO contact, screw terminals.","salesMarkdown":"The Siemens 3UG3081-1AK20 is a SIRIUS-brand insulation monitor designed for ungrounded AC networks (IT systems). It continuously measures insulation resistance in the range of 1 to 110 kΩ and triggers a 1 CO contact when the resistance drops below a set threshold. The supply voltage is AC 110/230 V at 50/60 Hz, with a wider rated range of 110–400 V AC. The 110–400 V AC rated supply covers most common panel voltages — 115 V, 230 V, 400 V — without needing a separate control transformer. The 1 CO contact is a single form-C relay output rated for the control circuit; it switches on a resistance drop below 85% of the setpoint (initial value 0.85). Fault storage is enabled by default, meaning the output latches after a fault clears until manually reset — useful for attended panels where you want a persistent alarm until acknowledged. The measurable line frequency covers 50 and 60 Hz, so it works globally on standard mains. IP20 protection means it's for dry indoor cabinets only — no washdown or dust-tight rating. The 45 mm width (one 9 mm module equivalent) fits tight layouts. Screw-type terminals accept solid or ferruled stranded conductors from 0.75 to 2.5 mm²; tighten to 0.5–0.8 N·m. No removable terminal for auxiliary circuits — wiring is fixed to the housing. Mounting position is any, and clearance distances (0 mm upwards, forwards, backwards, downwards, at the side) allow zero-gap side-by-side placement on the rail.","metaTitle":"Siemens 3UG3081-1AK20 SIRIUS Insulation Monitor, AC 110-400","metaDescription":"Siemens 3UG3081-1AK20 SIRIUS insulation monitor for ungrounded AC IT networks. Rated 110–400 V AC, IP20, screw terminals. Current production. RFQ for pricing.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Process / Temperature Controllers"],"specifications":{"Depth":"100 mm","Solid":"0.75 ... 2.5 mm²","Width":"45 mm","Height":"100 mm","Upwards":"0 mm","Forwards":"0 mm","Backwards":"0 mm","Downwards":"0 mm","At The Side":"0 mm","Rated Value":"110 ... 400 V","Fault Storage":"Yes","Initial Value":"0.85","Mounting Type":"screw and snap-on mounting onto 35 mm standard mounting rail","For Monitoring":"AC","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Full-Scale Value":"1.1","Product Function":"Insulation monitor","Delayed Switching":"1","Mounting Position":"any","Product Brand Name":"SIRIUS","protection class IP":"IP20","at 50 Hz rated value":"115 ... 230 V","at 60 Hz rated value":"115 ... 230 V","Measurable Line Frequency":"60 ... 50 Hz","With Screw-Type Terminals":"0.5 ... 0.8 N·m","Of The Control Supply Voltage":"AC","Type Of Electrical Connection":"screw-type terminals","Surge Voltage Resistance Rated Value":"4 000 V","reference code acc. to DIN EN 81346-2":"K","Of The Operating Voltage For Actuation":"AC","Finely Stranded With Core End Processing":"0.75 ... 2.5 mm²","Removable Terminal For Auxiliary And Control Circuit":"No"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/3UG3081-1AK20/alternatives.json"},"ai":{"faq":[{"question":"What is the supply voltage range?","answer":"Rated supply is 110–400 V AC; at 50/60 Hz the nominal is 115–230 V AC."},{"question":"What conductor sizes does the screw terminal accept?","answer":"Solid or ferruled stranded conductors from 0.75 to 2.5 mm², with a tightening torque of 0.5–0.8 N·m."},{"question":"Does it require clearance around the module for ventilation?","answer":"No — all clearance distances are 0 mm, so modules can be mounted side by side without gaps."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG3081-1AK20","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/3UG3081-1AK20 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}}