{"schemaVersion":1,"slug":"current-window-monitoring-relay","name":"Current window monitoring relay","kind":"symbol","abbreviation":"I WINDOW","aliases":["HCR1F27","VCR1F27"],"category":"measurement-protection","drawingTypes":["SLD","Schematic"],"referenceFamilies":["Manufacturer"],"summary":"A current-window relay supervises both minimum and maximum current conditions.","description":["A current-window relay supervises both minimum and maximum current conditions. Its drawing links the measured circuit to separate or combined outputs according to the actual relay configuration."],"readingNotes":["Identify the permitted current band and any start-up inhibition.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["State both thresholds","Reference timing/inhibit logic","Show output assignment"],"distinction":"A current window is a range-supervision function, not a measurement accuracy band.","facts":[{"label":"Drawing role","value":"Monitoring element"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"label":"Public vendor block reference","value":"HCR1F27, VCR1F27 (Autodesk identifiers; not IEC symbol numbers)"},{"label":"Identifier status","value":"The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name."}],"references":[{"sourceId":"pub-symbol-current-relays","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}],"related":["current-transformer","relay-coil"],"artwork":"edu-current-window-monitoring-relay","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/current-window-monitoring-relay","illustration":{"url":"https://eloragrid.ai/library/illustrations/current-window-monitoring-relay.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pub-symbol-current-relays","title":"AutoCAD Electrical: Current monitoring relays","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-E0DDA638-4664-4F1E-B191-29A4C40C4A0A.htm","type":"cad-reference","scope":"Public vendor catalogue naming and functional variants. Vendor block names are not IEC identifiers. Linked for reference; no graphics or CAD files are redistributed.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}]}