{"schemaVersion":1,"slug":"breaker-double-point-status-decoding","name":"Breaker double-point status decoding","kind":"symbol","abbreviation":"BDSD","aliases":["Breaker position and status interfaces","switchgear Breaker position and status interfaces","switchgear","Switchgear","52a and 52b states","Decoded breaker position"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Interprets the two independent auxiliary indications as open, closed or an invalid combination.","description":["Interprets the two independent auxiliary indications as open, closed or an invalid combination. Breaker status indications describe the operating mechanism, the removable truck or the health of a supporting system. These signals are related but are not interchangeable: an open breaker can still have its truck connected to live bus contacts.","In a switchgear control schematic, the bay controller compares independent status contacts before displaying a position or allowing another operation. The signal labels explain which physical state each contact represents. For this reference, the drawing identifies “52a and 52b states” at the input and “Decoded breaker position” at the output. Disagreement must remain distinguishable from transition.","Keep contact reference conditions, terminal numbers and interpretation logic together. Distinguish a mechanically operated indication from a measured current or voltage condition. 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: 52a and 52b states. Identify its source device or document and the state represented on the drawing.","Follow the named output: Decoded breaker position. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Disagreement must remain distinguishable from transition.","Keep contact reference conditions, terminal numbers and interpretation logic together. Distinguish a mechanically operated indication from a measured current or voltage condition."],"drawingChecklist":["Label the source and connection reference for 52a and 52b states.","Identify the destination and defined state of decoded breaker position.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Disagreement must remain distinguishable from transition."],"distinction":"Disagreement must remain distinguishable from transition. 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":"52a and 52b states"},{"label":"Output / connection","value":"Decoded breaker position"},{"label":"Lookup label","value":"BDSD is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-masterclad","relevance":"Public technical context for breaker position and status interfaces. 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","normally-open-contact","breaker-position-discrepancy-alarm"],"artwork":"pi26-breaker-double-point-status-decoding","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchgear","family":"positions","input":"52a and 52b states","output":"Decoded breaker position"},"plainEnglish":{"title":"What this block does","introduction":"Interprets the two independent auxiliary indications as open, closed or an invalid combination.","example":"In a switchgear control schematic, the bay controller compares independent status contacts before displaying a position or allowing another operation. The signal labels explain which physical state each contact represents. For this reference, the drawing identifies “52a and 52b states” at the input and “Decoded breaker position” at the output. Disagreement must remain distinguishable from transition.","drawings":"Start at the named input: 52a and 52b states. Identify its source device or document and the state represented on the drawing. Follow the named output: Decoded breaker position. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"52a and 52b states"},{"name":"Output","meaning":"Decoded breaker position"},{"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":["52a and 52b states","BDSD","Decoded breaker position"],"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-positions"},"url":"https://eloragrid.ai/symbols/breaker-double-point-status-decoding","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/breaker-double-point-status-decoding.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 position and status interfaces. 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."}]}