{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4618-1CR20","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4618-1CR20","canonicalUrl":"https://aoctrl.com/siemens/3UG4618-1CR20","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4618-1CR20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG4618-1CR20 network monitoring relay, 90-400 VAC 50/60 Hz, 3 A rated output, LCD display, 5-function digital setting, 22.5 mm wide.","salesMarkdown":"The Siemens SIRIUS 3UG4618-1CR20 is a network monitoring relay with digital setting, designed for AC phase monitoring. It detects phase asymmetry, overvoltage, and undervoltage across a 90-400 VAC range at 50/60 Hz. The relay provides a 3 A rated output at 250/400 VAC, suitable for signaling or direct control of downstream contactors. Housed in a 22.5 mm wide enclosure with snap-on DIN-rail mounting, it fits standard control panel layouts. The LCD display shows measured values and settings, with no separate LED display version. IP20 finger-safe terminals accept 2x (20-14 AWG) solid or stranded wire. The relay offers five selectable functions (phase sequence, phase failure, asymmetry, overvoltage, undervoltage) with a delayed switching option set to 2 seconds. Auto-reset is enabled by default, meaning the output re-energizes once the fault clears — useful for unattended restart in pump or fan applications. ## Ratings and Environmental Limits The auxiliary contact is rated 1 A at 24 V, 0.2 A at 125 V, and 0.1 A at 250 V — these are the switching limits for the internal relay; the 3 A output at 250/400 VAC is the main load contact. The 91 mm depth fits standard 100 mm deep enclosures with clearance for wiring.","metaTitle":"Siemens 3UG4618-1CR20 SIRIUS Network Monitoring Relay, 90-40","metaDescription":"Siemens 3UG4618-1CR20 SIRIUS network monitoring relay, 90-400 VAC, 3 A output, LCD display, phase asymmetry & overvoltage detection. Active lifecycle, 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":"102 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":"Yes","Between The Outputs":"Yes","Degree Of Pollution":"3","Product Designation":"Network monitoring relay with digital setting","at AWG cables solid":"2x (20 ... 14)","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","Design Of The Display":"LCD","Design Of The Product":"5 functions","Overvoltage Detection":"Yes","For Auxiliary Contacts":"2","Undervoltage Detection":"Yes","at AWG cables stranded":"2x (20 ... 14)","Phase Failure Detection":"Yes","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":"screw-type 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":"0.5 ... 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/3UG4618-1CR20/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for the 3UG4618-1CR20?","answer":"The relay monitors AC voltage from 90 to 400 VAC at 50/60 Hz, with a 3 A rated output contact at 250/400 VAC. It detects phase asymmetry, overvoltage, and undervoltage, and includes a 2-second delayed switching option."},{"question":"What is the physical size and mounting of the 3UG4618-1CR20?","answer":"It is 22.5 mm wide, 102 mm high, and 91 mm deep. It snaps onto a DIN rail (snap-on mounting) and can be mounted in any position. Terminal wires are 2x (20-14 AWG) solid or stranded."},{"question":"Does the 3UG4618-1CR20 have an LCD display?","answer":"Yes, it has an LCD display for showing measured values and configuration. There is no separate LED display version."},{"question":"What compliance documentation is available for the 3UG4618-1CR20?","answer":"The part carries IP20 protection and is rated for pollution degree 3. Standard Siemens documentation includes RoHS and REACH declarations; UL and IEC certifications are typical for the SIRIUS series but are not explicitly listed in this evidence."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4618-1CR20","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/3UG4618-1CR20 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}}