{"schemaVersion":1,"slug":"closing-circuit-fuse-failure-alarm","name":"Closing-circuit fuse-failure alarm","kind":"symbol","abbreviation":"CFA","aliases":["Breaker closing controls","switchgear Breaker closing controls","switchgear","Switchgear","Closing supply supervision","Closing-circuit alarm"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Reports loss of the supply or fuse continuity serving the closing release.","description":["Reports loss of the supply or fuse continuity serving the closing release. A closing circuit combines an operator or automatic request with the conditions that allow the breaker to close. The closing coil releases stored mechanism energy where that construction is used; it is different from the spring-charging motor.","In a switchgear bus-coupler panel, a close request is checked against position, mechanism readiness and the selected live-bus or dead-bus conditions before the closing circuit is enabled. For this reference, the drawing identifies “Closing supply supervision” at the input and “Closing-circuit alarm” at the output. A closing-supply alarm differs from a trip-supply alarm.","Follow request, permission and final coil output as separate signals. A permissive diagram must say which conditions block closing and what happens if a feedback signal becomes unavailable. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation."],"readingNotes":["Start at the named input: Closing supply supervision. Identify its source device or document and the state represented on the drawing.","Follow the named output: Closing-circuit alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.","A closing-supply alarm differs from a trip-supply alarm.","Follow request, permission and final coil output as separate signals. A permissive diagram must say which conditions block closing and what happens if a feedback signal becomes unavailable."],"drawingChecklist":["Label the source and connection reference for closing supply supervision.","Identify the destination and defined state of closing-circuit alarm.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: A closing-supply alarm differs from a trip-supply alarm."],"distinction":"A closing-supply alarm differs from a trip-supply alarm. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.","facts":[{"label":"Representation","value":"Functional block"},{"label":"Installation focus","value":"Switchgear"},{"label":"Input / boundary","value":"Closing supply supervision"},{"label":"Output / connection","value":"Closing-circuit alarm"},{"label":"Lookup label","value":"CFA is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-masterclad","relevance":"Public technical context for breaker closing controls. Breaker control, mechanism, position contacts, racking interlocks and test interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["circuit-breaker","25-synchronism-check","closing-coil-isolation-test-link"],"artwork":"pi26-closing-circuit-fuse-failure-alarm","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchgear","family":"close","input":"Closing supply supervision","output":"Closing-circuit alarm"},"plainEnglish":{"title":"What this block does","introduction":"Reports loss of the supply or fuse continuity serving the closing release.","example":"In a switchgear bus-coupler panel, a close request is checked against position, mechanism readiness and the selected live-bus or dead-bus conditions before the closing circuit is enabled. For this reference, the drawing identifies “Closing supply supervision” at the input and “Closing-circuit alarm” at the output. A closing-supply alarm differs from a trip-supply alarm.","drawings":"Start at the named input: Closing supply supervision. Identify its source device or document and the state represented on the drawing. Follow the named output: Closing-circuit alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Closing supply supervision"},{"name":"Output","meaning":"Closing-circuit alarm"},{"name":"Application reference","meaning":"An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections."}],"diagram":"flow","steps":["Closing supply supervision","CFA","Closing-circuit alarm"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Masterclad medium-voltage switchgear: circuit-breaker section interlocks","url":"https://productinfo.se.com/masterclad_mv_switchgear_ib/6055-30-masterclad-15kv-mv-switchgear-ib/English/6055-30%20Masterclad%20MV%20Switchgear%20Indoor%20%28bookmap%29_DD00646805.xml/%24/Section6-CircuitBreakerSectionInter-58DD6EC7"}],"profileId":"power-installation-close"},"url":"https://eloragrid.ai/symbols/closing-circuit-fuse-failure-alarm","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/closing-circuit-fuse-failure-alarm.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-masterclad","publisher":"Schneider Electric","title":"Masterclad medium-voltage switchgear: circuit-breaker section interlocks","url":"https://productinfo.se.com/masterclad_mv_switchgear_ib/6055-30-masterclad-15kv-mv-switchgear-ib/English/6055-30%20Masterclad%20MV%20Switchgear%20Indoor%20%28bookmap%29_DD00646805.xml/%24/Section6-CircuitBreakerSectionInter-58DD6EC7","scope":"Breaker control, mechanism, position contacts, racking interlocks and test interfaces.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for breaker closing controls. Breaker control, mechanism, position contacts, racking interlocks and test interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}