{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4581-2AW31","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4581-2AW31","canonicalUrl":"https://aoctrl.com/siemens/3UG4581-2AW31","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4581-2AW31","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG4581-2AW31 insulation monitoring relay, analog setting, 24-240 V AC/DC supply, 0-400 V AC measurable range, 22.5 mm width, spring-loaded terminals.","salesMarkdown":"The Siemens SIRIUS 3UG4581-2AW31 is an insulation monitoring relay with analog setting. Initial value is 0.85, full-scale value 1.1. It monitors AC voltages from 0 to 400 V at line frequencies of 50 or 60 Hz. The control supply voltage is AC/DC, rated 24 to 240 V at both 50 and 60 Hz — so it works off the same supply it's monitoring, or a separate control voltage in the same range. A single delayed-switching output (1 delayed switching) provides the alarm; there are no NC or NO contacts for delayed switching (0 each), so the output is a single changeover relay with adjustable delay. Housing is 22.5 mm wide, 78 mm high, 100 mm deep — a standard slimline enclosure that snaps onto 35 mm DIN rail (snap-on fastening). Clearance around the unit is zero in all directions (upwards, downwards, forwards, backwards, at the side), so it can be packed tight against other components without derating for airflow. Mounting position is any orientation. Terminals are spring-loaded (cage clamp) accepting 2x solid conductors 20-16 AWG or 2x stranded 18-16 AWG, and finely stranded with ferrule 0.5-1.5 mm². IP20 protection — suitable for clean, dry control cabinets only. Brand is SIRIUS, Siemens' industrial control component family.","metaTitle":"Siemens 3UG4581-2AW31 SIRIUS Insulation Monitor, 24-240V AC/","metaDescription":"Siemens SIRIUS 3UG4581-2AW31 insulation monitoring relay, 24-240V AC/DC supply, monitors 0-400V AC lines. Spring terminals, 22.5mm wide. Current production. Source via RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Process / Temperature Controllers"],"specifications":{"Depth":"100 mm","Solid":"20 ... 16","Width":"22.5 mm","Height":"78 mm","Upwards":"0 mm","Forwards":"0 mm","Stranded":"18 ... 16","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","at AWG cables solid":"2x (20 ... 16)","protection class IP":"IP20","at 50 Hz rated value":"24 ... 240 V","at 60 Hz rated value":"24 ... 240 V","at AWG cables stranded":"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":"spring-loaded 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 ... 1.5 mm²","control supply voltage at DC rated value":"24 ... 240 V","Finely Stranded Without Core End Processing":"0.5 ... 1.5 mm²","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/3UG4581-2AW31/alternatives.json"},"ai":{"faq":[{"question":"What voltage range does it monitor?","answer":"It measures AC voltage from 0 to 400 V at line frequencies of 50 to 60 Hz."},{"question":"What type of output does it have?","answer":"A single delayed-switching output (1 delayed switching) with no NC or NO delayed contacts — it's a changeover relay with adjustable delay."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4581-2AW31","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/3UG4581-2AW31 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}}