The breaker failure protection system type TL-6r is designed for all substations of high and highest voltages, requiring individual tripping for each phase, performed additionally in two independent circuits of auxiliary voltage. The construction of TL-6r enables adaptation to changing arrangement of a substation in case it is expanded. It consists of terminals, each of which serves one substation bay, which are controlled by a central unit enabling configuration. Additionally the central unit acts as the event recorder and ensures communication with the “outer world”. Actual state of connections of the substation is presented with light emitting diodes.