{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4815-1AA40","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4815-1AA40","canonicalUrl":"https://aoctrl.com/siemens/3UG4815-1AA40","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4815-1AA40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS network monitoring relay, 3UG4815-1AA40, phase monitoring with LCD display, 3 A at 250 V, 22.5 mm, snap-on mounting.","salesMarkdown":"## Phase monitoring relay with LCD and IO-Link The Siemens SIRIUS 3UG4815-1AA40 is a network monitoring relay that tracks phase sequence, phase failure, and asymmetry on three-phase AC supplies. It combines five monitoring functions in one 22.5 mm housing, with an LCD for local readout and IO-Link COM2 (38.4 kBaud) for parameterization and diagnostics into a PLC or higher-level system. Rated operational current is 3 A at 250 V and 400 V at 50/60 Hz, which covers the typical control-circuit contactor coil or alarm load. The relay detects asymmetry and can be set for auto-reset or external reset, with a configurable start-up delay up to 999.9 s to ride through motor inrush or generator ramp-up. Terminal capacity accepts 2x (20–14) AWG solid or stranded, with zero clearance required on all sides — no derating for side-by-side installation. IP20 protection class means it is suited for dry indoor panels only; no washdown or dust ingress protection. Pollution degree 2 is the standard for normal industrial environments with non-conductive contamination.","metaTitle":"Siemens 3UG4815-1AA40 SIRIUS Phase Monitoring Relay, 3 A","metaDescription":"Siemens SIRIUS 3UG4815-1AA40 phase monitoring relay with LCD, asymmetry detection, IO-Link COM2. Rated 3 A at 250 V, snap-on 22.5 mm. Current lifecycle. 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":"102 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 ... 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 (20 ... 14)","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 (20 ... 14)","Phase Failure Detection":"Yes","Between Input And Output":"Yes","Relative Repeat Accuracy":"1 %","measurable voltage at AC":"160 ... 690 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":"screw-type 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":"0.5 ... 2.5 mm²","Number Of Poles For Main Current Circuit":"3","Tightening Torque With Screw-Type Terminals":"0.8 ... 1.2 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","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/3UG4815-1AA40/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this relay?","answer":"Rated operational current is 3 A at 250 V and 400 V at 50/60 Hz. Supply voltage is 24 V DC. It detects phase sequence, phase failure, and asymmetry, with a configurable start-up delay up to 999.9 s."},{"question":"Does this relay support IO-Link?","answer":"Yes, it supports IO-Link COM2 at 38.4 kBaud, enabling parameter setting and diagnostic data transfer to a master."},{"question":"What is the mounting method and dimensions?","answer":"Snap-on mounting onto 35 mm DIN rail. Width is 22.5 mm, depth 91 mm, height 102 mm. Mounting position is any, with zero clearance required on all sides."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4815-1AA40","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/3UG4815-1AA40 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}}