{"schemaVersion":1,"slug":"indication-lamp-supply-branch","name":"Indication-lamp supply branch","kind":"symbol","abbreviation":"ISB","aliases":["Switchgear control-power supervision","switchgear Switchgear control-power supervision","switchgear","Switchgear","Indication supply","Panel indication power"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Shows the separately identified power path serving local operating indications.","description":["Shows the separately identified power path serving local operating indications. Control power supplies the command, protection and indication equipment associated with a switchgear assembly. The drawing must distinguish the source, each distribution branch and the functions lost if that branch fails.","In a switchgear lineup, separate protected branches may feed trip coils, closing coils and protection electronics. Their alarm contacts help the station controller identify which operating capability is unavailable. For this reference, the drawing identifies “Indication supply” at the input and “Panel indication power” at the output. Lamp darkness alone does not prove an open breaker.","Follow the actual positive, negative or neutral returns and the protective device on each branch. A healthy voltage indication does not establish that every downstream path can deliver its required operating current. 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: Indication supply. Identify its source device or document and the state represented on the drawing.","Follow the named output: Panel indication power. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Lamp darkness alone does not prove an open breaker.","Follow the actual positive, negative or neutral returns and the protective device on each branch. A healthy voltage indication does not establish that every downstream path can deliver its required operating current."],"drawingChecklist":["Label the source and connection reference for indication supply.","Identify the destination and defined state of panel indication power.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Lamp darkness alone does not prove an open breaker."],"distinction":"Lamp darkness alone does not prove an open breaker. 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":"Indication supply"},{"label":"Output / connection","value":"Panel indication power"},{"label":"Lookup label","value":"ISB is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-station-power","relevance":"Public technical context for switchgear control-power supervision. Independent AC and DC sources for station auxiliary power. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["relay-coil","ac-to-dc-power-supply","control-power-ac-to-dc-interface"],"artwork":"pi26-indication-lamp-supply-branch","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchgear","family":"control-power","input":"Indication supply","output":"Panel indication power"},"plainEnglish":{"title":"What this block does","introduction":"Shows the separately identified power path serving local operating indications.","example":"In a switchgear lineup, separate protected branches may feed trip coils, closing coils and protection electronics. Their alarm contacts help the station controller identify which operating capability is unavailable. For this reference, the drawing identifies “Indication supply” at the input and “Panel indication power” at the output. Lamp darkness alone does not prove an open breaker.","drawings":"Start at the named input: Indication supply. Identify its source device or document and the state represented on the drawing. Follow the named output: Panel indication power. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Indication supply"},{"name":"Output","meaning":"Panel indication power"},{"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":["Indication supply","ISB","Panel indication power"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"SEL-RPM redundant power module","url":"https://selinc.com/products/RPM/"}],"profileId":"power-installation-control-power"},"url":"https://eloragrid.ai/symbols/indication-lamp-supply-branch","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/indication-lamp-supply-branch.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-station-power","publisher":"SEL","title":"SEL-RPM redundant power module","url":"https://selinc.com/products/RPM/","scope":"Independent AC and DC sources for station auxiliary power.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for switchgear control-power supervision. Independent AC and DC sources for station auxiliary power. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}