The image features a GE EntelliGuard G Power Circuit Breaker, which serves as the Main Service Disconnect Switch installed within a large commercial electrical panel. This high-amperage breaker is the primary safety device, protecting the entire facility's electrical system from catastrophic damage due to overloads and short circuits. It acts as the single, accessible control point for managing and safely shutting off all electrical power flowing into the building, a critical component for the commercial installation completed in Fullerton.