{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4633-2AL30","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4633-2AL30","canonicalUrl":"https://aoctrl.com/siemens/3UG4633-2AL30","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4633-2AL30","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG4633-2AL30 voltage monitoring relay, AC/DC 17-275 V, LCD display, IP20, 22.5 mm wide, snap-on mounting.","salesMarkdown":"The Siemens 3UG4633-2AL30 is a SIRIUS voltage monitoring relay with digital setting — it watches a supply line for undervoltage and overvoltage conditions and trips its output contacts when the measured voltage strays outside the programmed window. The monitored voltage range is 17 to 275 V AC/DC, covering most common control voltages from 24 VDC up to 230 VAC without needing a separate supply transformer. The relay's 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 maximum switching currents for resistive loads at those voltages. Relative repeat accuracy is 1 %, meaning the trip point will not drift more than 1 % of the set value from one cycle to the next — tight enough for protecting sensitive electronics or motor controls where a few volts of drift could cause nuisance trips. The 22.5 mm width and snap-on mounting (DIN rail) mean it fits the standard narrow-form-factor slot in a control panel, leaving room for other modules in the same row. IP20 protection means it is safe for dry indoor panels only — no washdown or dust ingress protection; mount it inside a cabinet with at least IP54 enclosure. This class of relay is installed in control panels to protect downstream equipment from supply anomalies — undervoltage can cause contactors to drop out unpredictably, overvoltage can damage drives and power supplies. The 3UG4633-2AL30 is built for that role with both detection functions in one unit and an auto-reset option so the line restarts automatically when voltage returns to normal. The LCD display shows the actual measured voltage and the programmed thresholds, which helps during commissioning and troubleshooting without needing a handheld meter.","metaTitle":"Siemens 3UG4633-2AL30 SIRIUS Voltage Monitoring Relay, 17-27","metaDescription":"Siemens 3UG4633-2AL30 SIRIUS voltage monitoring relay, 17-275 V AC/DC, undervoltage/overvoltage detection, LCD display, IP20, snap-on mounting. Current 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":"24 ... 16","Width":"22.5 mm","Height":"94 mm","Upwards":"0 mm","at 24 V":"1 A","Forwards":"0 mm","Stranded":"24 ... 16","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":"17 ... 275 V","Initial Value":"1","When Starting":"0.1 ... 20 s","During Storage":"85 ... -40 °C","External Reset":"Yes","For Monitoring":"AC/DC","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"85 ... -40 °C","Fastening Method":"snap-on mounting","Full-Scale Value":"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":"17 ... 275 V","at 60 Hz rated value":"17 ... 275 V","for AWG cables solid":"2x (24 ... 16)","Design Of The Display":"LCD","Overvoltage Detection":"Yes","Undervoltage Detection":"Yes","for AWG cables stranded":"2x (24 ... 16)","Between Input And Output":"Yes","Relative Repeat Accuracy":"1 %","measurable voltage at AC":"17 ... 275 V","measurable voltage at DC":"17 ... 275 V","overvoltage detection DC":"Yes","Measurable Line Frequency":"500 ... 40 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":"spring-loaded 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":"0.25 ... 1.5 mm²","Number Of Poles For Main Current Circuit":"1","Finely Stranded Without Core End Processing":"0.25 ... 1.5 mm²","shock resistance according to IEC 60068-2-27":"sinusoidal half-wave 15g / 11 ms","Between The Voltage Supply And Other Circuits":"No","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","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/3UG4633-2AL30/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings I need to check for fit?","answer":"The monitored voltage range is 17–275 V AC/DC. Output contacts are rated 1 A at 24 V, 0.2 A at 125 V, and 0.1 A at 250 V. Repeat accuracy is 1 %. Width is 22.5 mm for DIN-rail mounting."},{"question":"Does this relay detect both undervoltage and overvoltage?","answer":"Yes, it detects both undervoltage and overvoltage conditions, with separate adjustable thresholds."},{"question":"What is the operating temperature range?","answer":"During operation the ambient temperature range is -25 to +60 °C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4633-2AL30","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/3UG4633-2AL30 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}}