{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4581-1AW31","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4581-1AW31","canonicalUrl":"https://aoctrl.com/siemens/3UG4581-1AW31","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4581-1AW31","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG4581-1AW31 insulation monitoring relay, analog setting, AC/DC 24-240V, IP20, screw terminals, snap-on 35 mm DIN rail.","salesMarkdown":"Rated control supply voltage is 24 to 240 V AC/DC, covering most common control voltages in industrial panels without needing a separate power supply module. Measurable voltage range is 0 to 400 V AC at line frequencies of 50 to 60 Hz, so it fits standard mains networks across global sites. The relay includes a delayed switching function with one delayed switching element, plus an error memory that latches the alarm state until manually reset — useful for unattended substations where you need to know an intermittent fault occurred. Mounting position is any, so orientation is not a constraint in crowded panels. Dimensions: 78 mm high, 22.5 mm wide (one standard module width), 100 mm deep. Screw-type terminals accept solid wire 1x (20–12 AWG) or 2x (20–14 AWG), and stranded wire 1x (18–14 AWG) or 2x (18–16 AWG). Stripping length and torque are per standard Siemens practice for this terminal family. Clearance distances: upwards, forwards, backwards, downwards, and to the side are all 0 mm — meaning no mandatory air gap to adjacent components, though practical creepage distances for the 6 kV surge rating should be observed. Ambient temperature range during operation: -25 to +60 °C, covering most indoor industrial environments without derating. Surge voltage resistance rated at 6 kV.","metaTitle":"Siemens SIRIUS 3UG4581-1AW31 Insulation Monitoring Relay, 24","metaDescription":"Siemens SIRIUS 3UG4581-1AW31 insulation monitoring relay with analog setting. Rated 24-240V AC/DC, 0-400V AC measurable voltage. IP20, screw terminals, snap-on 35mm DIN rail. Curre","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","for AWG cables solid":"1x (20 ... 12), 2x (20 ... 14)","for AWG cables stranded":"1x (18 ... 14), 2x (18 ... 16)","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":"0.5 ... 2.5 mm²","control supply voltage at DC rated value":"24 ... 240 V","Finely Stranded Without Core End Processing":"0.5 ... 2.5 mm²","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","Adjustable Open/Closed-Circuit Current Principle":"No","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/3UG4581-1AW31/alternatives.json"},"ai":{"faq":[{"question":"What is the control supply voltage range?","answer":"The control supply voltage is 24 to 240 V AC/DC, covering both common low-voltage DC and line-voltage AC supplies."},{"question":"What is the measurable voltage range?","answer":"It measures insulation resistance on AC systems from 0 to 400 V at 50 to 60 Hz."},{"question":"What are the mounting dimensions?","answer":"The relay is 78 mm high, 22.5 mm wide, and 100 mm deep. It snaps onto a 35 mm DIN rail and requires no side clearance."},{"question":"Does it have an error memory?","answer":"Yes, it includes an error memory that retains the alarm state after a fault clears, helping identify intermittent insulation issues."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4581-1AW31","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/3UG4581-1AW31 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}}