{"id":"abb-rex-521-feeder-protection-relay-alarm-led-label-204ca57233","name":"REX 521, Feeder Protection Relay, Alarm LED Label","manufacturer":"ABB","category":"protection","description":"ABB REX 521, Feeder Protection Relay, Alarm LED Label: protection or metering reference for protection-panel and metering arrangement. Manufacturer reference 1MRS151300.","equipment":["REX 521, Feeder Protection Relay, Alarm LED Label"],"keywords":["REX 521, Feeder Protection Relay, Alarm LED Label","","1MRS151300","Protection, control and metering","protection","protection-panel and metering arrangement","protection or metering reference"],"markets":["Global"],"marketNote":"Confirm the exact regional configuration against the selected manufacturer drawing.","kind":"drawing","sourceUrl":"https://search.abb.com/library/Download.aspx?DocumentID=1MRS151300&LanguageCode=en&DocumentPartId=&Action=Launch&DocumentRevisionId=A","officialEvidenceUrl":"https://search.abb.com/library/Download.aspx?DocumentID=1MRS151300&LanguageCode=en&DocumentPartId=&Action=Launch&DocumentRevisionId=A","sourcePublisher":"ABB","formats":["PDF"],"availability":"direct","accessNote":"1 original file is available to download here. Manufacturer sources and revisions are listed below.","checkedAt":"2026-11-04","files":[{"id":"96f77a11fe14f1b9f42a","name":"1MRS151300.pdf","format":"PDF","purpose":"Manufacturer drawing reference 1MRS151300","url":"https://search.abb.com/library/Download.aspx?DocumentID=1MRS151300&LanguageCode=en&DocumentPartId=&Action=Launch&DocumentRevisionId=A","availability":"direct","sha256":"96f77a11fe14f1b9f42a68db2be6bf863c83d6f3efd7acbece115fa116ef1061","bytes":104184,"retrievedAt":"2026-11-04T00:29:55Z","filenameBasis":"document-reference","revision":"A","hosted":true,"redistribution":"unknown","validation":"signature-checked","documentNumber":"1MRS151300","latestRevisionUrl":"https://search.abb.com/library/Download.aspx?DocumentID=1MRS151300&LanguageCode=en&DocumentPartId=&Action=Launch","rightsReview":{"checkedAt":"2026-11-04","sources":["https://search.abb.com/library/Download.aspx?DocumentID=1MRS151300&LanguageCode=en&DocumentPartId=&Action=Launch&DocumentRevisionId=A"],"note":"Reviewed the available source, embedded drawing text and archive notices. No explicit applicable redistribution prohibition was identified. Rights remain unknown; no licence or manufacturer endorsement is asserted."},"hostingBasis":{"policy":"no-explicit-prohibition","checkedAt":"2026-11-04","evidenceUrl":"https://search.abb.com/library/Download.aspx?DocumentID=1MRS151300&LanguageCode=en&DocumentPartId=&Action=Launch&DocumentRevisionId=A","attribution":"ABB"},"delivery":{"kind":"original","name":"1MRS151300.pdf","format":"PDF","sha256":"96f77a11fe14f1b9f42a68db2be6bf863c83d6f3efd7acbece115fa116ef1061","bytes":104184,"includes":["1MRS151300.pdf"]},"downloadUrl":"https://eloragrid.ai/tools/cad-library/download/abb-rex-521-feeder-protection-relay-alarm-led-label-204ca57233/96f77a11fe14f1b9f42a"}],"fileClasses":["manufacturer PDF reference"],"configurationNote":"Manufacturer reference 1MRS151300 identifies this protection or metering reference.","technicalFacts":[{"label":"Manufacturer reference","value":"1MRS151300","sourceUrl":"https://search.abb.com/library/Download.aspx?DocumentID=1MRS151300&LanguageCode=en&DocumentPartId=&Action=Launch&DocumentRevisionId=A"},{"label":"Document revision","value":"A","sourceUrl":"https://search.abb.com/library/Download.aspx?DocumentID=1MRS151300&LanguageCode=en&DocumentPartId=&Action=Launch&DocumentRevisionId=A"}],"drawingNumber":"1MRS151300","equipmentFacts":[{"label":"Equipment / resource","value":"REX 521, Feeder Protection Relay, Alarm LED Label"},{"label":"Manufacturer","value":"ABB"},{"label":"Resource type","value":"Named drawing reference"},{"label":"Manufacturer drawing","value":"1MRS151300"},{"label":"Manufacturer reference","value":"1MRS151300"},{"label":"Document revision","value":"A"},{"label":"Listed file formats","value":"PDF"},{"label":"Listed files","value":"1"},{"label":"Available previews","value":"1 drawing previews"},{"label":"Recorded revisions","value":"A"},{"label":"Source checked","value":"2026-11-04"},{"label":"Download access","value":"Email registration for site downloads; official source links are also available"}],"previewImage":"/tools/cad-library/drawing-preview/abb-rex-521-feeder-protection-relay-alarm-led-label-204ca57233/96f77a11fe14f1b9f42a?asset=4b84d06815fcc58ff4bf4d2d812c49c6c97b0a13bb548d782ac43767aa0fd210","relatedReferences":[{"name":"Protection relay IED","url":"https://eloragrid.ai/objects/ga-protection-relay-ied"},{"name":"Power quality meter","url":"https://eloragrid.ai/objects/ga-power-quality-meter"}],"fileChoiceGuidance":["Use 1MRS151300.pdf revision A to read the original manufacturer sheet and its annotations."],"plainEnglish":{"title":"Using the REX 521, Feeder Protection Relay, Alarm LED Label reference","introduction":"ABB REX 521, Feeder Protection Relay, Alarm LED Label: protection or metering reference for protection-panel and metering arrangement. Manufacturer reference 1MRS151300.","example":"Use 1MRS151300.pdf revision A to read the original manufacturer sheet and its annotations.","drawings":"Use 1MRS151300.pdf revision A to read the original manufacturer sheet and its annotations.","terms":[],"diagram":"flow","steps":["Identify REX 521, Feeder Protection Relay, Alarm LED Label","Select the drawing or model","Check the mounting interface"],"caption":"Manufacturer reference 1MRS151300 identifies this protection or metering reference.","sources":[{"label":"ABB source","url":"https://search.abb.com/library/Download.aspx?DocumentID=1MRS151300&LanguageCode=en&DocumentPartId=&Action=Launch&DocumentRevisionId=A"}],"questions":[{"question":"What can I use the REX 521, Feeder Protection Relay, Alarm LED Label reference for?","answer":"Use this protection or metering reference for protection-panel and metering arrangement. Check the exact case, terminal arrangement and mounting option. A device outline does not determine protection settings, CT ratios or the electrical design of the protected circuit."},{"question":"Which manufacturer reference identifies this drawing?","answer":"ABB reference 1MRS151300. The file list retains the original source and recorded revision."}],"checklist":["Check the exact case, terminal arrangement and mounting option. A device outline does not determine protection settings, CT ratios or the electrical design of the protected circuit."]},"canonicalUrl":"https://eloragrid.ai/tools/cad-library/equipment/abb-rex-521-feeder-protection-relay-alarm-led-label-204ca57233"}