{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4511-1BQ20","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4511-1BQ20","canonicalUrl":"https://aoctrl.com/siemens/3UG4511-1BQ20","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4511-1BQ20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS phase monitoring relay, 3UG4511-1BQ20, 420-690 VAC 50/60 Hz, 3 A contact rating, snap-on DIN rail mount, IP20.","salesMarkdown":"The Siemens SIRIUS 3UG4511-1BQ20 is a single-function phase monitoring relay designed to supervise three-phase AC mains. It detects phase loss and incorrect phase sequence on supplies from 420 V to 690 V at both 50 Hz and 60 Hz, covering the common 480 V and 600 V industrial distribution voltages in North America and 400/690 V systems in Europe. For DC control circuits, the contacts handle 1 A at 24 V DC, 0.2 A at 125 V DC, and 0.1 A at 250 V DC — watch the DC derating curve if you're switching a DC-powered alarm circuit. Dimensions are 22.5 mm wide, 92 mm tall, and 91 mm deep — a standard footprint that fits alongside other SIRIUS control gear in a panel. No mounting clearance is required at any side (0 mm upwards, forwards, backwards, downwards, and at the side), so you can pack modules tight. Terminals accept 2 x (20-14) AWG solid or stranded wire — that's 0.5 to 2.5 mm². The spring-cage or screw terminals (depending on variant) are sized for standard control wiring. Strip length is typically 8-10 mm; no special ferrules required for stranded wire in this gauge range.","metaTitle":"Siemens 3UG4511-1BQ20 SIRIUS Phase Monitoring Relay, 420-690","metaDescription":"Siemens SIRIUS 3UG4511-1BQ20 phase monitoring relay for 420-690 VAC 3-phase systems. Rated 3 A at 400 V. Snap-on DIN rail mount. IP20. Active production.","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":"420 ... 690 V","at 60 Hz rated value":"420 ... 690 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":"420 ... 690 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/3UG4511-1BQ20/alternatives.json"},"ai":{"faq":[{"question":"What voltage range does this relay monitor?","answer":"It monitors three-phase AC supplies from 420 V to 690 V at both 50 Hz and 60 Hz. This covers 480 V and 600 V nominal systems commonly found in North American industrial plants, as well as 400/690 V European networks."},{"question":"What are the output contact ratings?","answer":"The relay contacts are rated 3 A at 400 V AC (50/60 Hz), 1 A at 24 V DC, 0.2 A at 125 V DC, and 0.1 A at 250 V DC. Use the AC rating for contactor coils or small motor loads; use the DC ratings for PLC inputs or alarm circuits, noting the significant derating at higher DC voltages."},{"question":"What is the physical size and mounting?","answer":"It snaps onto a 35 mm DIN rail and measures 22.5 mm wide, 92 mm high, and 91 mm deep. No side clearance is needed — zero mm in all directions — so modules can be mounted flush."},{"question":"What wire sizes does it accept?","answer":"The terminals accept 2 x (20-14) AWG solid or stranded conductors, which corresponds to 0.5 to 2.5 mm². This covers standard control wiring for contactor coils and signal circuits."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4511-1BQ20","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/3UG4511-1BQ20 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}}