# Switchgear **Domain:** Electrical Engineering / Infrastructure **Doc Type:** Technical Concept Node **Maturity:** Developed ## Definition **Switchgear** is the coordinated assembly of switching, interruption, protection, isolation and control equipment used to distribute electrical power and clear faults. ## Governing Variable Switchgear governs whether an electrical path is energized and how abnormal current is isolated before it damages equipment or endangers people. ## Material and Computational Manifestation Breakers, disconnects, fuses, protective relays, buses, enclosures and control circuits convert protection policy into physical interruption. Monitoring systems can expose current, voltage, breaker status, events and power quality to an [[wiki/EPMS|electrical power monitoring system]]. ## Relation to Governance Switchgear is a literal control boundary inside [[wiki/Electrical Grid|electrical grids]], buildings and [[wiki/Data Center|data centers]]. It demonstrates how a high-level continuity objective becomes local, safety-critical transition logic. ## Constitutional Question and Failure Modes Automation must preserve safe local operation and intelligible manual authority. Mis-coordination, hidden common dependencies, unauthorized remote control or maintenance error can convert a small disturbance into a facility-wide outage. ## Related Ontology [[wiki/Substation|Substation]] · [[wiki/Electrical Grid|Electrical Grid]] · [[wiki/Control Loop|Control Loop]] · [[wiki/Building Management System|Building Management System]] · [[wiki/AI Factory|AI Factory]]