{"schemaVersion":1,"slug":"breaker-close-failure-timer","name":"Breaker close-failure timer","kind":"symbol","abbreviation":"BCT","aliases":["Breaker closing controls","switchgear Breaker closing controls","switchgear","Switchgear","Close request and feedback","Failed-to-close alarm"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Detects that the requested close was not confirmed within the configured supervision interval.","description":["Detects that the requested close was not confirmed within the configured supervision interval. 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 “Close request and feedback” at the input and “Failed-to-close alarm” at the output. The timer is not a breaker operating-time specification.","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: Close request and feedback. Identify its source device or document and the state represented on the drawing.","Follow the named output: Failed-to-close alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.","The timer is not a breaker operating-time specification.","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 close request and feedback.","Identify the destination and defined state of failed-to-close alarm.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: The timer is not a breaker operating-time specification."],"distinction":"The timer is not a breaker operating-time specification. 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":"Close request and feedback"},{"label":"Output / connection","value":"Failed-to-close alarm"},{"label":"Lookup label","value":"BCT 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","close-command-cancellation-input"],"artwork":"pi26-breaker-close-failure-timer","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchgear","family":"close","input":"Close request and feedback","output":"Failed-to-close alarm"},"plainEnglish":{"title":"What this block does","introduction":"Detects that the requested close was not confirmed within the configured supervision interval.","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 “Close request and feedback” at the input and “Failed-to-close alarm” at the output. The timer is not a breaker operating-time specification.","drawings":"Start at the named input: Close request and feedback. Identify its source device or document and the state represented on the drawing. Follow the named output: Failed-to-close alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Close request and feedback"},{"name":"Output","meaning":"Failed-to-close 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":["Close request and feedback","BCT","Failed-to-close 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/breaker-close-failure-timer","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/breaker-close-failure-timer.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."}]}