{"schemaVersion":1,"slug":"breaker-shunt-trip-coil","name":"Breaker shunt-trip coil","kind":"symbol","abbreviation":"BSC","aliases":["Breaker trip circuits","switchgear Breaker trip circuits","switchgear","Switchgear","Trip supply and command","Opening mechanism release"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Uses an externally supplied electrical pulse to release the breaker opening mechanism.","description":["Uses an externally supplied electrical pulse to release the breaker opening mechanism. A trip circuit carries an opening request from a control or protection device to the breaker operating mechanism. The opening command, the coil supply and the evidence that the breaker opened are separate parts of the drawing.","In a switchgear incomer panel, a protection relay requests opening and an auxiliary contact reports the resulting breaker position. A second trip path can have its own supply and wiring so that a single wiring fault does not remove both paths. For this reference, the drawing identifies “Trip supply and command” at the input and “Opening mechanism release” at the output. A shunt trip needs the specified control energy.","Trace the initiating contact, protective fuse, trip coil, return conductor and feedback independently. Identify which elements are shared between redundant paths. The diagram explains the intended command path; coil ratings and terminal numbers come from the selected breaker. 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: Trip supply and command. Identify its source device or document and the state represented on the drawing.","Follow the named output: Opening mechanism release. Cross-reference its destination and separate the command from confirmation that the equipment responded.","A shunt trip needs the specified control energy.","Trace the initiating contact, protective fuse, trip coil, return conductor and feedback independently. Identify which elements are shared between redundant paths. The diagram explains the intended command path; coil ratings and terminal numbers come from the selected breaker."],"drawingChecklist":["Label the source and connection reference for trip supply and command.","Identify the destination and defined state of opening mechanism release.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: A shunt trip needs the specified control energy."],"distinction":"A shunt trip needs the specified control energy. 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":"Trip supply and command"},{"label":"Output / connection","value":"Opening mechanism release"},{"label":"Lookup label","value":"BSC is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-masterclad","relevance":"Public technical context for breaker trip circuits. 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","86-lockout","breaker-trip-coil-one-interface"],"artwork":"pi26-breaker-shunt-trip-coil","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchgear","family":"trip","input":"Trip supply and command","output":"Opening mechanism release"},"plainEnglish":{"title":"What this block does","introduction":"Uses an externally supplied electrical pulse to release the breaker opening mechanism.","example":"In a switchgear incomer panel, a protection relay requests opening and an auxiliary contact reports the resulting breaker position. A second trip path can have its own supply and wiring so that a single wiring fault does not remove both paths. For this reference, the drawing identifies “Trip supply and command” at the input and “Opening mechanism release” at the output. A shunt trip needs the specified control energy.","drawings":"Start at the named input: Trip supply and command. Identify its source device or document and the state represented on the drawing. Follow the named output: Opening mechanism release. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Trip supply and command"},{"name":"Output","meaning":"Opening mechanism release"},{"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":["Trip supply and command","BSC","Opening mechanism release"],"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-trip"},"url":"https://eloragrid.ai/symbols/breaker-shunt-trip-coil","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/breaker-shunt-trip-coil.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 trip circuits. 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."}]}