{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4511-1AP20","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4511-1AP20","canonicalUrl":"https://aoctrl.com/siemens/3UG4511-1AP20","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4511-1AP20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG4511-1AP20 phase monitoring relay, AC monitoring, 320-500 V AC 50/60 Hz, 1 changeover contact, 22.5 mm, IP20, snap-on mounting.","salesMarkdown":"The Siemens 3UG4511-1AP20 is a SIRIUS phase monitoring relay that watches for phase loss and phase sequence on three-phase AC supplies. It's a single-function unit — one relay, one job: monitor the line and drop the output if a phase goes missing or the rotation reverses. Rated for 320 to 500 V AC at both 50 and 60 Hz, it covers the common 400 V industrial distribution bus. The output is a single changeover contact rated 3 A at 250 V AC or 400 V AC (50/60 Hz), and 1 A at 24 V DC, 0.2 A at 125 V DC, 0.1 A at 250 V DC — enough to signal a PLC input or drop out a contactor coil. Housed in a 22.5 mm wide enclosure, IP20 rated, with snap-on DIN rail mounting. If you're freezing a design or filling a production run, this part is a safe choice for the foreseeable future. The 22.5 mm width means it takes up one standard modular device slot — no extra space needed for side clearance (0 mm clearance specified upwards, downwards, forwards, backwards, and at the side). Strip length and screw torque follow standard Siemens SIRIUS practice for the 3UG4 family.","metaTitle":"Siemens 3UG4511-1AP20 SIRIUS Phase Monitoring Relay, 320-500","metaDescription":"Siemens 3UG4511-1AP20 SIRIUS phase monitoring relay for AC systems, 320-500 V AC, 50/60 Hz, 3 A contacts, IP20, snap-on mounting. Current lifecycle stage.","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":"83 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":"1","Mounting Position":"any","Product Brand Name":"SIRIUS","Asymmetry Detection":"No","Between The Outputs":"Yes","Degree Of Pollution":"3","at AWG cables solid":"2x (20 ... 14)","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":"1","Undervoltage Detection":"No","at AWG cables stranded":"2x (20 ... 14)","Phase Failure Detection":"Yes; available but limited, detection is problematic with high levels of regenerative power recovery","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":"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/3UG4511-1AP20/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for the 3UG4511-1AP20?","answer":"It monitors AC supplies from 320 to 500 V at 50/60 Hz. The output contact is rated 3 A at 250/400 V AC, 1 A at 24 V DC, 0.2 A at 125 V DC, and 0.1 A at 250 V DC. Operating temperature range is -25 to +60 °C."},{"question":"What is the physical size and mounting of the 3UG4511-1AP20?","answer":"It is 22.5 mm wide, 83 mm high, and 91 mm deep. It snaps onto a 35 mm DIN rail in any position, with zero clearance required on all sides."},{"question":"What wire sizes does the 3UG4511-1AP20 accept?","answer":"It accepts solid or stranded wire from 20 to 14 AWG, and dual solid conductors of the same size."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4511-1AP20","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/3UG4511-1AP20 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}}