{"schemaVersion":1,"slug":"ansi-frequency-monitoring-relay","name":"ANSI/IEEE Frequency monitoring relay form","kind":"symbol","abbreviation":"f MON","aliases":["HCR1F40","VCR1F40","IEEE Frequency Relay","ANSI Frequency monitoring relay"],"category":"measurement-protection","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-library form of frequency monitoring relay: a frequency relay issues a documented output for a configured frequency condition.","description":["This reference locates frequency monitoring relay in Autodesk's IEEE-oriented miscellaneous relays family. A frequency relay issues a documented output for a configured frequency condition. The schematic identifies its measurement input and links its thresholds to the settings record. The public library uses HCR1F40 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 high frequency, low frequency or both are monitored. A frequency relay applies operating criteria; a frequency meter only indicates the measured value. 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 high frequency, low frequency or both are monitored.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Name measured bus","Reference thresholds and delay","Show output contacts"],"distinction":"A frequency relay applies operating criteria; a frequency meter only indicates the measured value.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview: Miscellaneous Relays; published form: Frequency Relay."},{"label":"Public vendor block","value":"HCR1F40. 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-miscellaneous-relays","relevance":"Public IEEE-oriented Miscellaneous Relays table explicitly lists HCR1F40 as Frequency Relay. This supports the vendor convention context, not reproduction of the publisher graphic."}],"related":["frequency-monitoring-relay","current-transformer","relay-coil"],"artwork":"s28-ansi-frequency-monitoring-relay","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Frequency Relay","reference":"Autodesk IEEE Symbol Preview: Miscellaneous Relays, block HCR1F40. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.","counterpart":"frequency-monitoring-relay"},"plainEnglish":{"title":"What does ANSI/IEEE Frequency monitoring relay form mean?","introduction":"This reference locates frequency monitoring relay in Autodesk's IEEE-oriented miscellaneous relays family. A frequency relay issues a documented output for a configured frequency condition. The schematic identifies its measurement input and links its thresholds to the settings record. The public library uses HCR1F40 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 high frequency, low frequency or both are monitored. A frequency relay applies operating criteria; a frequency meter only indicates the measured value. 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":"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."},{"name":"Terminal","meaning":"An identified point where a conductor connects."}],"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: Miscellaneous Relays","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-DA549E3E-4ABB-426E-9331-0226EF55EAA7.htm"}],"detail":"IEEE-library form of frequency monitoring relay: a frequency relay issues a documented output for a configured frequency condition. A frequency relay applies operating criteria; a frequency meter only indicates the measured value.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/ansi-frequency-monitoring-relay","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-frequency-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-miscellaneous-relays","title":"Autodesk IEEE Symbol Preview: Miscellaneous Relays","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-DA549E3E-4ABB-426E-9331-0226EF55EAA7.htm","type":"cad-reference","scope":"Public miscellaneous 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 Miscellaneous Relays table explicitly lists HCR1F40 as Frequency Relay. This supports the vendor convention context, not reproduction of the publisher graphic."}]}