On-Board Electrical System, and Method for Operating an On-Board Electrical System

Described is an on-board electrical system for a vehicle. The on-board electrical system includes a first sub-network having a first energy source and one or more first electrical consumers, a second sub-network having a second energy source and one or more second electrical consumers, and an isolating switching element which is designed to isolate the first sub-network from the second sub-network. The on-board electrical system also includes at least one event-relevant electrical consumer and a changeover switching element which is designed to selectively couple the event-relevant consumer to the first sub-network or to the second sub-network bypassing the isolating switching element.