{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4816-2AA40","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4816-2AA40","canonicalUrl":"https://aoctrl.com/siemens/3UG4816-2AA40","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4816-2AA40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG4816-2AA40 network monitoring relay with digital setting, 5 functions, LCD display, 22.5 mm width, 3 A at 400 V, IP20.","salesMarkdown":"The Siemens SIRIUS 3UG4816-2AA40 is a network monitoring relay with digital setting, designed to monitor phase parameters in three-phase AC systems. It detects phase loss, phase sequence, and asymmetry, and can also monitor undervoltage or overvoltage — five selectable functions in one 22.5 mm-wide housing. The LCD display shows the measured values and settings directly, so you can read line conditions without a separate meter. Rated control supply voltage is 24 V AC/DC. The output relay contacts are rated 3 A at 250 V and 400 V at 50/60 Hz, with lower ratings for DC loads: 1 A at 24 V, 0.2 A at 125 V, 0.1 A at 250 V. That means the relay can switch small motor starters, contactors, or signal lamps directly in most control panels. The asymmetry detection catches a blown fuse or a lost phase before the motor overheats — a common failure mode in aging distribution. The 22.5 mm width and snap-on mounting let it clip onto standard DIN rail without drilling. Depth is 91 mm, height 103 mm — fits most enclosures without crowding the gland plate. Pollution degree 2 covers normal industrial environments with non-conductive contamination. The relay offers an adjustable start-up delay (0 to 999.9 s,) to ride through momentary dips, plus delayed switching and auto-reset or external reset options. IO-Link communication at COM2 (38.4 kBaud,) allows parameter readback and remote monitoring — useful if you are integrating into a higher-level SCADA or PLC system. The LCD display shows the actual line voltage and fault codes, so a field tech can diagnose without a laptop.","metaTitle":"Siemens 3UG4816-2AA40 SIRIUS Phase Monitoring Relay, 3 A","metaDescription":"Siemens 3UG4816-2AA40 SIRIUS phase monitoring relay, 3 A at 400 V, 22.5 mm wide, LCD display, asymmetry detection, active production.","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":"103 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":"24 ... 24 V","When Starting":"0 ... 999.9 s","During Storage":"-40 ... +85 °C","External Reset":"Yes","For Monitoring":"AC","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +85 °C","Fastening Method":"snap-on mounting","Product Function":"Phase monitoring relay","Delayed Switching":"1","Mounting Position":"any","Product Brand Name":"SIRIUS","Asymmetry Detection":"Yes","Degree Of Pollution":"2","Product Designation":"Network monitoring relay with digital setting","at AWG cables solid":"2x (24 ... 16)","display version LED":"No","protection class IP":"IP20","at 250 V at 50/60 Hz":"3 A","at 400 V at 50/60 Hz":"3 A","at 50 Hz rated value":"0 ... 0 V","at 60 Hz rated value":"0 ... 0 V","Design Of The Display":"LCD","Design Of The Product":"5 functions","IO-Link transfer rate":"COM2 (38,4 kBaud)","Overvoltage Detection":"Yes","For Auxiliary Contacts":"1","Undervoltage Detection":"Yes","at AWG cables stranded":"2x (24 ... 16)","Phase Failure Detection":"Yes","Between Input And Output":"Yes","Relative Repeat Accuracy":"1 %","measurable voltage at AC":"90 ... 400 V","Phase Sequence Recognition":"Yes","Accuracy Of Digital Display":"+/-1 digit","Relative Metering Precision":"5 %","Of The Control Supply Voltage":"DC","Overvoltage Detection 3 Phase":"Yes","Substance Prohibitance (Date)":"05/01/2012","Type Of Electrical Connection":"spring-loaded terminals","Undervoltage Detection 3 Phases":"Yes","Voltage Window Recognition 3 Phase":"Yes","With Lower Or Upper Limit Violation":"0 ... 999.9 s","operational current at 17 V minimum":"20 mA","Surge Voltage Resistance Rated Value":"6 kV","With Degree Of Pollution 2 Rated Value":"690 V","protocol is supported IO-Link protocol":"Yes","due to burst according to IEC 61000-4-4":"2 kV","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":"3","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":"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","ampacity of the semiconductor output in SIO mode":"200 mA","Mechanical Service Life (Operating Cycles) Typical":"10 000 000","electrostatic discharge according to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","Type Of Voltage Supply Via Input/Output Link Master":"Yes","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","Of The Address Range Of The Inputs With Cyclical Transfer Total":"4 byte","Of The Address Range Of The Outputs With Cyclical Transfer Total":"2 byte","point-to-point cycle time between master and IO-Link device minimum":"10 ms","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/3UG4816-2AA40/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this phase monitoring relay?","answer":"Rated control supply 24 V AC/DC. Output contacts: 3 A at 250 V and 400 V at 50/60 Hz. DC ratings: 1 A at 24 V, 0.2 A at 125 V, 0.1 A at 250 V. Operating temperature -25 to +60 °C, IP20."},{"question":"What functions does the 3UG4816-2AA40 offer?","answer":"Five selectable monitoring functions: phase loss, phase sequence, asymmetry, undervoltage, and overvoltage. It also has adjustable start-up delay (0–999.9 s,), auto-reset, and external reset."},{"question":"What is the physical size and mounting?","answer":"Width 22.5 mm, height 103 mm, depth 91 mm. Snap-on DIN-rail mounting, any orientation."},{"question":"Does it have IO-Link communication?","answer":"Yes, IO-Link at COM2 (38.4 kBaud,) for parameter access and remote monitoring."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4816-2AA40","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/3UG4816-2AA40 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}}