{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4581-1AW30","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4581-1AW30","canonicalUrl":"https://aoctrl.com/siemens/3UG4581-1AW30","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4581-1AW30","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS insulation monitoring relay, 3UG4581-1AW30, 0-400 VAC measurable voltage, 24-240 VAC/DC supply, snap-on 35 mm DIN rail, IP20.","salesMarkdown":"The Siemens SIRIUS 3UG4581-1AW30 is an insulation monitoring relay with analog setting, designed for continuous supervision of ungrounded AC systems (IT systems) up to 400 VAC. It measures insulation resistance against earth and triggers an alarm when the value drops below the set threshold (initial value 0.85, full-scale 1.1). The wide control supply range — 24 to 240 VAC/DC — means it can be wired into most control panels without a separate power supply module. The screw-type terminals accept solid 20–12 AWG or stranded 18–14 AWG (0.75–2.5 mm² with ferrule), with a tightening torque of 0.6–0.8 N·m. IP20 protection suits clean, dry cabinet environments — no washdown areas. The measurable voltage range of 0–400 VAC at 50/60 Hz defines the system voltage it can monitor — this is for standard low-voltage IT networks up to 400 V line-to-line. The control supply voltage (24–240 VAC/DC) is separate from the monitored circuit; you can power the relay from a 24 VDC panel supply while it watches a 400 V motor feeder. Surge voltage resistance rated at 6000 V gives confidence against switching transients in industrial panels. The 100 mm depth fits standard shallow enclosures; the 22.5 mm width matches the compact SIRIUS modular profile, leaving room for adjacent contactors or relays on the same DIN rail.","metaTitle":"Siemens SIRIUS 3UG4581-1AW30 Insulation Monitoring Relay, 0-","metaDescription":"Siemens SIRIUS 3UG4581-1AW30 insulation monitoring relay, 0-400 VAC, 50/60 Hz, 24-240 VAC/DC supply, IP20, snap-on DIN rail. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Process / Temperature Controllers"],"specifications":{"Depth":"100 mm","Solid":"20 ... 12","Width":"22.5 mm","Height":"78 mm","Upwards":"0 mm","Forwards":"0 mm","Stranded":"18 ... 14","Backwards":"0 mm","Downwards":"0 mm","At The Side":"0 mm","Error Memory":"Yes","Initial Value":"0.85","For Monitoring":"AC","lifecycle_stage":"current","Fastening Method":"snap-on fastening on 35 mm DIN rail","Full-Scale Value":"1.1","Product Function":"Insulation monitor","Delayed Switching":"1","Mounting Position":"any","Product Brand Name":"SIRIUS","Product Designation":"Insulation monitoring relay with analog setting","protection class IP":"IP20","at 50 Hz rated value":"24 ... 240 V","at 60 Hz rated value":"24 ... 240 V","measurable voltage at AC":"0 ... 400 V","Measurable Line Frequency":"50 ... 60 Hz","Of The Control Supply Voltage":"AC/DC","Substance Prohibitance (Date)":"05/01/2012","Type Of Electrical Connection":"screw-type terminals","Operating Frequency Rated Value":"50 ... 60 Hz","Ambient Temperature During Operation":"-25 ... +60 °C","Surge Voltage Resistance Rated Value":"6 000 V","Of The Operating Voltage For Actuation":"AC/DC","number of NC contacts delayed switching":"0","number of NO contacts delayed switching":"0","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"0.75 ... 2.5 mm²","control supply voltage at DC rated value":"24 ... 240 V","Tightening Torque With Screw-Type Terminals":"0.6 ... 0.8 N·m","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"0","Thermal Current Of The Switching Element With Contacts Maximum":"4 A","Product Component 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/3UG4581-1AW30/alternatives.json"},"ai":{"faq":[{"question":"What is the measurable voltage range?","answer":"It monitors AC systems from 0 to 400 V at 50/60 Hz."},{"question":"What supply voltage does it need?","answer":"The control supply accepts 24–240 VAC/DC, so it works with common panel voltages without an extra converter."},{"question":"What compliance documentation is available?","answer":"RoHS and REACH compliance is indicated, with a substance prohibition date of 05/01/2012."},{"question":"How does it mount and what are the terminal specs?","answer":"Snap-on onto 35 mm DIN rail, any position. Screw terminals accept solid 20–12 AWG or stranded 18–14 AWG (0.75–2.5 mm² with ferrule), torque 0.6–0.8 N·m."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4581-1AW30","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/3UG4581-1AW30 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}}