{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4511-1BN20","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4511-1BN20","canonicalUrl":"https://aoctrl.com/siemens/3UG4511-1BN20","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4511-1BN20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG4511-1BN20 phase monitoring relay, 160-260 V AC 50/60 Hz, 3 A rated contact current, IP20, snap-on mounting.","salesMarkdown":"## Phase monitoring relay for AC line supervision The Siemens 3UG4511-1BN20 is a SIRIUS phase monitoring relay designed to supervise AC supply lines for undervoltage, overvoltage, and phase loss. The relay's output contacts are rated at 3 A at 250 V or 400 V AC (50/60 Hz), which is sufficient to signal a PLC input or drop out a contactor coil. This unit does not include asymmetry detection, overvoltage detection, or undervoltage detection as separate functions — it is a single-function relay that triggers on phase loss or voltage deviation outside the set window. A green LED on the front confirms the output state, and the relay offers a delayed switching time of 2 seconds to ride through brief dips. The 22.5 mm width fits standard panel spacing. ## Wiring and integration notes Terminals are screw-type, and the unit has two auxiliary contact sets (changeover). The auto-reset function is enabled by default, meaning the output re-energizes once the monitored voltage returns to the acceptable window after the delay period. If a latched fault indication is needed, an external reset circuit must be added. Mounting position is unrestricted, and the relay requires zero clearance above, below, or to the sides (0 mm clearance specified in all directions). This simplifies panel layout when space is tight.","metaTitle":"Siemens 3UG4511-1BN20 SIRIUS Phase Monitoring Relay, 160-260","metaDescription":"Siemens 3UG4511-1BN20 SIRIUS phase monitoring relay for AC systems, 160-260 V AC, 50/60 Hz, 3 A contact rating, IP20, snap-on mounting, LED display, auto-reset. Current lifecycle s","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","Initial Value":"1","During Storage":"-40 ... +85 °C","For Monitoring":"AC","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +85 °C","Fastening Method":"snap-on mounting","Full-Scale Value":"1","Product Function":"Phase monitoring relay","Delayed Switching":"2","Mounting Position":"any","Product Brand Name":"SIRIUS","Asymmetry Detection":"No","Between The Outputs":"Yes","Degree Of Pollution":"3","display version LED":"Yes","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":"160 ... 260 V","at 60 Hz rated value":"160 ... 260 V","for AWG cables solid":"2x (20 ... 14)","Design Of The Product":"1 function","Overvoltage Detection":"No","For Auxiliary Contacts":"2","Undervoltage Detection":"No","Phase Failure Detection":"No","for AWG cables stranded":"2x (20 ... 14)","Between Input And Output":"Yes","measurable voltage at AC":"160 ... 260 V","Phase Sequence Recognition":"Yes","Of The Control Supply Voltage":"AC","Overvoltage Detection 3 Phase":"No","Substance Prohibitance (Date)":"05/01/2012","Type Of Electrical Connection":"screw-type terminals","Undervoltage Detection 3 Phases":"No","Voltage Window Recognition 3 Phase":"No","operational current at 17 V minimum":"5 mA","Surge Voltage Resistance Rated Value":"6 kV","With Degree Of Pollution 3 Rated Value":"690 V","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":"No","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","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/3UG4511-1BN20/alternatives.json"},"ai":{"faq":[{"question":"What is the rated voltage range for this relay?","answer":"The rated voltage range is 160 to 260 V AC at both 50 Hz and 60 Hz."},{"question":"What is the contact rating?","answer":"The output contacts are rated at 3 A at 250 V AC and 3 A at 400 V AC (50/60 Hz). Additionally, at 24 V DC the rating is 1 A, at 125 V DC it is 0.2 A, and at 250 V DC it is 0.1 A."},{"question":"Does this relay detect phase asymmetry or over/undervoltage?","answer":"No, the 3UG4511-1BN20 is a single-function phase monitoring relay that does not include asymmetry detection, overvoltage detection, or undervoltage detection as separate functions. It triggers on phase loss or voltage deviation outside the set window."},{"question":"What is the mounting method and dimensions?","answer":"It snap-mounts onto a 35 mm DIN rail, has a width of 22.5 mm, height of 92 mm, and depth of 91 mm. Mounting position is any, and zero clearance is required on all sides."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4511-1BN20","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/3UG4511-1BN20 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}}