{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4631-1AW30","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4631-1AW30","canonicalUrl":"https://aoctrl.com/siemens/3UG4631-1AW30","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4631-1AW30","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG4631-1AW30 voltage monitoring relay, 24-240 V AC/DC, overvoltage and undervoltage detection, LCD display, IP20, 22.5 mm wide.","salesMarkdown":"The Siemens 3UG4631-1AW30 is a SIRIUS voltage monitoring relay — a DIN-rail-mount device that watches a single-phase AC or DC supply and trips its output contacts when the voltage strays outside a set window. It detects both overvoltage and undervoltage conditions, so it holds the unit on the grid only as long as the supply stays within the configured limits. Rated supply range is 24 to 240 V AC/DC at 50 or 60 Hz, which covers most industrial control voltages from 24 VDC panels up to 240 VAC motor control centers. The relay uses a digital setting via the LCD display — no trim pots to drift over a season of thermal cycling. ## Key Ratings and Their Meaning for Fit The 22.5 mm width and 92 mm height fit a standard single-module DIN-rail footprint; snap-on mounting means it clips into place without tools. Depth of 91 mm leaves clearance for wiring in a 120 mm deep enclosure — provided the gland plate isn't crowded directly behind it. Output contacts are rated 1 A at 24 V, 0.2 A at 125 V, and 0.1 A at 250 V — these are the switching limits for the relay's internal contacts. If the load exceeds these, an interposing contactor is required. The relative repeat accuracy of 1 % means the trip point won't wander more than 1 % of the set value over temperature and time. No official successor has been published, and no second-source cross-reference exists in the Siemens documentation. The part is the current design; if a buyer needs a drop-in alternative, the only path is the same order code.","metaTitle":"Siemens 3UG4631-1AW30 SIRIUS Voltage Monitoring Relay, 24-24","metaDescription":"Siemens 3UG4631-1AW30 SIRIUS voltage monitoring relay, 24-240 V AC/DC, over/undervoltage detection, LCD display, IP20, DIN-rail mount. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Process / Temperature Controllers"],"specifications":{"Depth":"91 mm","Solid":"20 ... 14","Width":"22.5 mm","Height":"92 mm","Upwards":"0 mm","at 24 V":"1 A","Forwards":"0 mm","Stranded":"20 ... 14","at 125 V":"0.2 A","at 250 V":"0.1 A","Backwards":"0 mm","Downwards":"0 mm","auto-RESET":"Yes","At The Side":"0 mm","Rated Value":"24 ... 240 V","Initial Value":"0.85","During Storage":"-40 ... +85 °C","External Reset":"Yes","For Monitoring":"AC/DC","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +85 °C","Fastening Method":"snap-on mounting","Full-Scale Value":"1.1","Product Function":"Voltage monitoring relay","Mounting Position":"any","Product Brand Name":"SIRIUS","Between The Outputs":"Yes","Product Designation":"Voltage monitoring relay with digital 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":"2x (20 ... 14)","Design Of The Display":"LCD","Overvoltage Detection":"Yes","Undervoltage Detection":"Yes","for AWG cables stranded":"2x (20 ... 14)","Between Input And Output":"Yes","Relative Repeat Accuracy":"1 %","measurable voltage at AC":"0.1 ... 60 V","measurable voltage at DC":"0.1 ... 60 V","overvoltage detection DC":"Yes","Measurable Line Frequency":"40 ... 500 Hz","undervoltage detection DC":"Yes","Accuracy Of Digital Display":"+/-1 digit","Relative Metering Precision":"5 %","Of The Control Supply Voltage":"AC/DC","Overvoltage Detection 1 Phase":"Yes","Overvoltage Detection 3 Phase":"No","Substance Prohibitance (Date)":"05/01/2012","Type Of Electrical Connection":"screw-type terminals","voltage window recognition DC":"Yes","Undervoltage Detection 1 Phase":"Yes","Undervoltage Detection 3 Phases":"No","Design Of The Electrical Isolation":"Protective separation","Voltage Window Recognition 1 Phase":"Yes","Voltage Window Recognition 3 Phase":"No","With Lower Or Upper Limit Violation":"0.1 ... 20 s","operational current at 17 V minimum":"5 mA","Surge Voltage Resistance Rated Value":"4 kV","Between Control And Auxiliary Circuit":"300 V","With Degree Of Pollution 3 Rated Value":"690 V","Between Auxiliary And Auxiliary Circuit":"300 V","due to burst according to IEC 61000-4-4":"2 kV","number of CO contacts delayed switching":"1","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","Number Of Poles For Main Current Circuit":"1","Tightening Torque With Screw-Type Terminals":"1.2 ... 0.8 N·m","shock resistance according to IEC 60068-2-27":"sinusoidal half-wave 15g / 11 ms","Between The Voltage Supply And Other Circuits":"Yes","operating frequency with 3RT2 contactor maximum":"5 000 1/h","vibration resistance according to IEC 60068-2-6":"1 ... 6 Hz: 15 mm, 6 ... 500 Hz: 2g","Adjustable Open/Closed-Circuit Current Principle":"Yes","Mechanical Service Life (Operating Cycles) Typical":"10 000 000","Relative Temperature-Related Measurement Deviation":"0.1 %","electrostatic discharge according to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Thermal Current Of The Switching Element With Contacts Maximum":"5 A","continuous current of the DIAZED fuse link of the output relay":"4 A","Product Component Removable Terminal For Auxiliary And Control Circuit":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/3UG4631-1AW30/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings I need to check for fit?","answer":"Supply voltage 24–240 V AC/DC, output contact ratings 1 A at 24 V / 0.2 A at 125 V / 0.1 A at 250 V, IP20 enclosure, operating temperature -25 to +60 °C, and DIN-rail snap-on mounting with a 22.5 mm width."},{"question":"Does this relay monitor both overvoltage and undervoltage?","answer":"Yes, it detects both overvoltage and undervoltage conditions, with a digital setting via the LCD display. The relative repeat accuracy is 1 %."},{"question":"Will the 3UG4631-1AW30 drop into a panel specified for a different brand's voltage monitor?","answer":"The 22.5 mm DIN-rail footprint and snap-on mounting are standard across most manufacturers, so it will physically fit the same rail. However, wiring and function must be verified against the specific panel design — the output contact ratings and supply voltage range are the critical checks."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4631-1AW30","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/3UG4631-1AW30 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}}