{"schemaVersion":1,"slug":"centre-break-disconnector-application-reference","name":"Centre-break disconnector application reference","kind":"symbol","abbreviation":"CDAR","aliases":["Disconnector and earthing applications","switchyards Disconnector and earthing applications","switchyards","Switchyards","Primary terminal pair","Centre-break isolation function"],"category":"power-distribution","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Identifies the documented disconnector construction with its defined centre-opening contact arrangement.","description":["Identifies the documented disconnector construction with its defined centre-opening contact arrangement. Disconnector and earthing references identify different mechanical constructions and connection duties within a yard. The primary diagram shows which conductors are joined or earthed; the equipment drawing explains how its contacts and supports move.","In a switchyard bay, a bus selector can use a different physical construction from a line disconnector. Each device still needs an identified operating mechanism, position indication and interlocking interface. For this reference, the drawing identifies “Primary terminal pair” at the input and “Centre-break isolation function” at the output. The construction does not imply fault-interruption capability.","The construction name does not establish load-breaking capability, short-circuit making duty or operating permission. Verify these properties in the selected equipment data and the station interlocking scheme. 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: Primary terminal pair. Identify its source device or document and the state represented on the drawing.","Follow the named output: Centre-break isolation function. Cross-reference its destination and separate the command from confirmation that the equipment responded.","The construction does not imply fault-interruption capability.","The construction name does not establish load-breaking capability, short-circuit making duty or operating permission. Verify these properties in the selected equipment data and the station interlocking scheme."],"drawingChecklist":["Label the source and connection reference for primary terminal pair.","Identify the destination and defined state of centre-break isolation function.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: The construction does not imply fault-interruption capability."],"distinction":"The construction does not imply fault-interruption capability. 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":"Switchyards"},{"label":"Input / boundary","value":"Primary terminal pair"},{"label":"Output / connection","value":"Centre-break isolation function"},{"label":"Lookup label","value":"CDAR is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-disconnectors","relevance":"Public technical context for disconnector and earthing applications. Disconnector construction, earthing switches and operating mechanisms. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["disconnector","earthing-switch","double-side-break-disconnector-application-reference"],"artwork":"pi26-centre-break-disconnector-application-reference","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchyards","family":"yard-disconnectors","input":"Primary terminal pair","output":"Centre-break isolation function"},"plainEnglish":{"title":"What this block does","introduction":"Identifies the documented disconnector construction with its defined centre-opening contact arrangement.","example":"In a switchyard bay, a bus selector can use a different physical construction from a line disconnector. Each device still needs an identified operating mechanism, position indication and interlocking interface. For this reference, the drawing identifies “Primary terminal pair” at the input and “Centre-break isolation function” at the output. The construction does not imply fault-interruption capability.","drawings":"Start at the named input: Primary terminal pair. Identify its source device or document and the state represented on the drawing. Follow the named output: Centre-break isolation function. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Primary terminal pair"},{"name":"Output","meaning":"Centre-break isolation function"},{"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":["Primary terminal pair","CDAR","Centre-break isolation function"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Disconnectors and earthing switches","url":"https://www.siemens-energy.com/global/en/home/products-services/product-offerings/disconnectors-earthing-switches.html"}],"profileId":"power-installation-yard-disconnectors"},"url":"https://eloragrid.ai/symbols/centre-break-disconnector-application-reference","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/centre-break-disconnector-application-reference.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-disconnectors","publisher":"Siemens Energy","title":"Disconnectors and earthing switches","url":"https://www.siemens-energy.com/global/en/home/products-services/product-offerings/disconnectors-earthing-switches.html","scope":"Disconnector construction, earthing switches and operating mechanisms.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for disconnector and earthing applications. Disconnector construction, earthing switches and operating mechanisms. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}