{"schemaVersion":1,"slug":"ansi-maximum-current-monitoring-relay","name":"ANSI/IEEE Maximum-current monitoring relay form","kind":"symbol","abbreviation":"I HIGH","aliases":["HCR1F25","VCR1F25","IEEE Maximum Current Protection","ANSI Maximum-current monitoring relay"],"category":"measurement-protection","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-library form of maximum-current monitoring relay: a maximum-current relay changes its output when the measured current meets a configured high-current condition.","description":["This reference locates maximum-current monitoring relay in Autodesk's IEEE-oriented current protection relays family. A maximum-current relay changes its output when the measured current meets a configured high-current condition. Its schematic separates measurement, auxiliary power and relay outputs. The public library uses HCR1F25 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","Trace the measured quantity or initiating control signal separately from the output contacts. The device tag links the sensing or operating element to the controlled circuit; settings, reset behaviour and the actual terminal arrangement belong in the selected equipment documentation.","Determine whether the input is direct current, a CT secondary or a conditioned signal. A maximum-current monitoring element is not a complete feeder protection scheme by itself. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted."],"readingNotes":["Determine whether the input is direct current, a CT secondary or a conditioned signal.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Identify measured input","Reference threshold and delay","Show output destination"],"distinction":"A maximum-current monitoring element is not a complete feeder protection scheme by itself.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview: Current Protection Relays; published form: Maximum Current Protection."},{"label":"Public vendor block","value":"HCR1F25. Vendor library token, not an IEEE symbol number."},{"label":"Drawing role","value":"Monitoring element"},{"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."},{"label":"Artwork scope","value":"Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified."}],"references":[{"sourceId":"s28-ieee-current-protection-relays","relevance":"Public IEEE-oriented Current Protection Relays table explicitly lists HCR1F25 as Maximum Current Protection. This supports the vendor convention context, not reproduction of the publisher graphic."}],"related":["maximum-current-monitoring-relay","current-transformer","relay-coil"],"artwork":"s28-ansi-maximum-current-monitoring-relay","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Maximum Current Protection","reference":"Autodesk IEEE Symbol Preview: Current Protection Relays, block HCR1F25. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.","counterpart":"maximum-current-monitoring-relay"},"plainEnglish":{"title":"What does ANSI/IEEE Maximum-current monitoring relay form mean?","introduction":"This reference locates maximum-current monitoring relay in Autodesk's IEEE-oriented current protection relays family. A maximum-current relay changes its output when the measured current meets a configured high-current condition. Its schematic separates measurement, auxiliary power and relay outputs. The public library uses HCR1F25 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","example":"Trace the measured quantity or initiating control signal separately from the output contacts. The device tag links the sensing or operating element to the controlled circuit; settings, reset behaviour and the actual terminal arrangement belong in the selected equipment documentation.","drawings":"Determine whether the input is direct current, a CT secondary or a conditioned signal. A maximum-current monitoring element is not a complete feeder protection scheme by itself. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.","terms":[{"name":"DC","meaning":"Direct current: electricity flowing in one direction."},{"name":"Normally open / normally closed","meaning":"The contact state in the normal condition defined for the drawing."},{"name":"Coil","meaning":"A wound conductor that can produce a magnetic field when energised."}],"diagram":"flow","steps":["Identify the device and form","Read the connections and state","Check the equipment reference"],"caption":"A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.","sources":[{"label":"Autodesk IEEE Symbol Preview: Current Protection Relays","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-EC11EC4D-374C-4191-9534-C802D3932711.htm"}],"detail":"IEEE-library form of maximum-current monitoring relay: a maximum-current relay changes its output when the measured current meets a configured high-current condition. A maximum-current monitoring element is not a complete feeder protection scheme by itself.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/ansi-maximum-current-monitoring-relay","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-maximum-current-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":"s28-ieee-current-protection-relays","title":"Autodesk IEEE Symbol Preview: Current Protection Relays","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-EC11EC4D-374C-4191-9534-C802D3932711.htm","type":"cad-reference","scope":"Public current protection relays family names and vendor block tokens. Horizontal, vertical and rotated placements are not separate engineering functions. Exact standard geometry is not reproduced.","checkedOn":"2026-10-28","reuse":"link-only","relevance":"Public IEEE-oriented Current Protection Relays table explicitly lists HCR1F25 as Maximum Current Protection. This supports the vendor convention context, not reproduction of the publisher graphic."}]}