{"schemaVersion":1,"slug":"independent-trip-supply-changeover","name":"Independent trip-supply changeover","kind":"symbol","abbreviation":"ITC","aliases":["Breaker trip circuits","switchgear Breaker trip circuits","switchgear","Switchgear","Supply health contacts","Selected trip supply"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Selects an available supply for a documented trip circuit without merging the two source circuits.","description":["Selects an available supply for a documented trip circuit without merging the two source circuits. 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 “Supply health contacts” at the input and “Selected trip supply” at the output. Source changeover must preserve circuit segregation.","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: Supply health contacts. Identify its source device or document and the state represented on the drawing.","Follow the named output: Selected trip supply. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Source changeover must preserve circuit segregation.","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 supply health contacts.","Identify the destination and defined state of selected trip supply.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Source changeover must preserve circuit segregation."],"distinction":"Source changeover must preserve circuit segregation. 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":"Supply health contacts"},{"label":"Output / connection","value":"Selected trip supply"},{"label":"Lookup label","value":"ITC 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","trip-coil-pulse-extension"],"artwork":"pi26-independent-trip-supply-changeover","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchgear","family":"trip","input":"Supply health contacts","output":"Selected trip supply"},"plainEnglish":{"title":"What this block does","introduction":"Selects an available supply for a documented trip circuit without merging the two source circuits.","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 “Supply health contacts” at the input and “Selected trip supply” at the output. Source changeover must preserve circuit segregation.","drawings":"Start at the named input: Supply health contacts. Identify its source device or document and the state represented on the drawing. Follow the named output: Selected trip supply. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Supply health contacts"},{"name":"Output","meaning":"Selected trip supply"},{"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":["Supply health contacts","ITC","Selected trip supply"],"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/independent-trip-supply-changeover","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/independent-trip-supply-changeover.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."}]}