{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4618-2CR20","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4618-2CR20","canonicalUrl":"https://aoctrl.com/siemens/3UG4618-2CR20","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4618-2CR20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG4618-2CR20 phase and network monitoring relay, digital setting, 90-400 V AC, 3 A contacts, 22.5 mm wide, IP20.","salesMarkdown":"The Siemens 3UG4618-2CR20 is a SIRIUS phase and network monitoring relay with digital setting. It monitors AC three-phase systems for phase loss, phase sequence, asymmetry, and overvoltage, with adjustable thresholds via the LCD display. Rated for 90-400 V AC at 50/60 Hz, the output contacts switch 3 A at 250 V or 400 V (resistive). The 90-400 V AC rated range covers both 208 V and 400 V three-phase networks common in industrial panels. The 3 A contact rating at 250/400 V is sized for signaling to a PLC input or contactor coil, not motor switching. Asymmetry detection and overvoltage monitoring are built in, with the LCD showing the set point and fault status. The 22.5 mm width fits a standard single-module slot; clearance is needed above and below for wiring (103 mm height, 91 mm depth). IP20 means it's for enclosure use only.","metaTitle":"Siemens 3UG4618-2CR20 SIRIUS Phase Monitoring Relay, 90-400","metaDescription":"Siemens 3UG4618-2CR20 SIRIUS phase monitoring relay. Rated 90-400 V AC, 3 A contacts. Current production. IP20, 22.5 mm wide. RFQ for volume.","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":"103 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":"Yes","Between The Outputs":"Yes","Degree Of Pollution":"3","Product Designation":"Network monitoring relay with digital setting","display version LED":"No","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":"90 ... 400 V","at 60 Hz rated value":"90 ... 400 V","for AWG cables solid":"2x (24 ... 16)","Design Of The Display":"LCD","Design Of The Product":"5 functions","Overvoltage Detection":"Yes","For Auxiliary Contacts":"2","Undervoltage Detection":"Yes","Phase Failure Detection":"Yes","for AWG cables stranded":"2x (24 ... 16)","Between Input And Output":"Yes","Relative Repeat Accuracy":"1 %","measurable voltage at AC":"90 ... 400 V","Phase Sequence Recognition":"Yes","Accuracy Of Digital Display":"+/-1 digit","Relative Metering Precision":"5 %","Of The Control Supply Voltage":"AC","Overvoltage Detection 3 Phase":"Yes","Substance Prohibitance (Date)":"05/01/2012","Type Of Electrical Connection":"spring-loaded terminals","Undervoltage Detection 3 Phases":"Yes","Voltage Window Recognition 3 Phase":"Yes","With Lower Or Upper Limit Violation":"0.1 ... 20 s","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/3UG4618-2CR20/alternatives.json"},"ai":{"faq":[{"question":"What is the rated supply voltage range?","answer":"90-400 V AC at 50/60 Hz, suitable for most three-phase industrial networks."},{"question":"What are the output contact ratings?","answer":"3 A at 250 V AC or 400 V AC, 50/60 Hz, resistive load."},{"question":"What functions does this relay monitor?","answer":"Phase sequence, phase failure, asymmetry, and overvoltage on AC three-phase systems."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4618-2CR20","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/3UG4618-2CR20 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}}