{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4511-2BP20","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4511-2BP20","canonicalUrl":"https://aoctrl.com/siemens/3UG4511-2BP20","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4511-2BP20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG4511-2BP20 phase monitoring relay, 320-500 VAC 50/60 Hz, 3 A contact rating, 22.5 mm, snap-on mounting.","salesMarkdown":"The Siemens SIRIUS 3UG4511-2BP20 is a single-function phase monitoring relay that monitors AC three-phase systems for phase loss and phase sequence. It detects the presence and correct rotation of all three phases and switches its output contacts accordingly. Rated for a supply voltage of 320 to 500 VAC at both 50 Hz and 60 Hz, it covers the common 400 V industrial mains without needing a separate control transformer. The output relay is rated to switch 3 A at 250 V or 400 V (50/60 Hz), and derates to 1 A at 24 V, 0.2 A at 125 V, and 0.1 A at 250 V for DC loads. The relay offers an auto-reset function, meaning it automatically re-energizes its output when the monitored phases return to normal after a fault. A delayed switching of 2 seconds is built in to ride through brief dips or transients without nuisance tripping. Housed in a 22.5 mm wide enclosure (94 mm high, 91 mm deep), it snaps directly onto a standard DIN rail. Clearance of 0 mm is required on all sides (up, down, forward, backward, and side), so it can be packed tightly against other devices. A green LED indicates the operating status.","metaTitle":"Siemens 3UG4511-2BP20 SIRIUS Phase Monitoring Relay, 320-500","metaDescription":"Siemens SIRIUS 3UG4511-2BP20 phase monitoring relay, rated 320-500 VAC 50/60 Hz, 3 A contact rating. Current production. Snap-on 22.5 mm housing. RFQ for lead time.","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","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","at AWG cables solid":"2x (24 ... 16)","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":"320 ... 500 V","at 60 Hz rated value":"320 ... 500 V","Design Of The Product":"1 function","Overvoltage Detection":"No","For Auxiliary Contacts":"2","Undervoltage Detection":"No","at AWG cables stranded":"2x (24 ... 16)","Phase Failure Detection":"No","Between Input And Output":"Yes","measurable voltage at AC":"320 ... 500 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":"spring-loaded 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":"0.25 ... 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":"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/3UG4511-2BP20/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this phase monitoring relay?","answer":"It monitors AC three-phase systems from 320 to 500 VAC at 50/60 Hz. The output relay is rated 3 A at 250 V or 400 V (50/60 Hz), with lower ratings for DC loads. It includes a 2-second delayed switching and auto-reset function."},{"question":"What is the physical size and mounting?","answer":"The enclosure is 22.5 mm wide, 94 mm high, and 91 mm deep. It snaps onto a standard DIN rail and requires zero clearance on all sides. IP20 rated."},{"question":"What wire sizes does it accept?","answer":"Terminals accept solid or stranded wire from 24 to 16 AWG, including two solid conductors per terminal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4511-2BP20","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/3UG4511-2BP20 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}}