{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4512-1AR20","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4512-1AR20","canonicalUrl":"https://aoctrl.com/siemens/3UG4512-1AR20","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4512-1AR20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS phase monitoring relay, 3UG4512-1AR20, 160-690 VAC 50/60 Hz, 3 A rated contacts, IP20, snap-on mounting.","salesMarkdown":"The Siemens SIRIUS 3UG4512-1AR20 is a phase monitoring relay that monitors three-phase AC supplies for phase loss and phase sequence. The output relay contacts are rated for 3 A at 250 VAC or 400 VAC at 50/60 Hz, and for DC loads: 1 A at 24 V, 0.2 A at 125 V, and 0.1 A at 250 V. This covers most control-circuit and small auxiliary load switching. ## Key Ratings in Context The relay offers automatic reset after fault recovery, which is useful for unattended installations where manual reset is impractical. It does not detect asymmetry, overvoltage, or undervoltage — it is a phase-loss and phase-sequence monitor only. The depth is 91 mm, height 83 mm, and the unit requires 0 mm clearance on all sides (up, down, forward, backward, side) — no ventilation gaps needed.","metaTitle":"Siemens SIRIUS 3UG4512-1AR20 Phase Monitoring Relay, 160-690","metaDescription":"Siemens SIRIUS 3UG4512-1AR20 phase monitoring relay, rated 160-690 VAC 50/60 Hz, 3 A contacts, IP20, snap-on mounting. Current production. 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":"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":"160 ... 690 V","at 60 Hz rated value":"160 ... 690 V","Design Of The Product":"2 functions","Overvoltage Detection":"No","For Auxiliary Contacts":"1","Undervoltage Detection":"No","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","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/3UG4512-1AR20/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings of the 3UG4512-1AR20?","answer":"It monitors 160-690 VAC at 50/60 Hz, has output contacts rated 3 A at 250/400 VAC, and operates from -25 to +60 °C. It mounts on a 22.5 mm DIN rail with IP20 protection."},{"question":"Does the 3UG4512-1AR20 detect asymmetry, overvoltage, or undervoltage?","answer":"No. It monitors only phase loss and phase sequence. Asymmetry, overvoltage, and undervoltage detection are not supported."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4512-1AR20","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/3UG4512-1AR20 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}}