Fuse device for a high-voltage system and method for securing a high-voltage system

The invention relates to a safety device for a high-voltage system, having a coupling device, which high-voltage components of the high-voltage system switchably coupled to external components, and which is designed to separate in response to operation of a fuse switch, the high-voltage components electrically by external components, a discharge circuit, which is adapted to discharge the high-voltage components in response to the operation of the circuit breaker electrically, and a monitoring device which is adapted to monitor electrical parameters of the discharge circuit or the high-voltage components, and to release the locking of a housing for the high-voltage components, if at least one of electrical parameters of the discharge circuit or the high voltage components below a predetermined threshold.