Abstract: A circuit configuration for a signalling device in circuit breaker units, in particular in power circuit breakers, which have an electronic tripping device and which become effective in the event of a fault in an electrical system to be protected, whereby the electronic tripping device includes a microcontroller which performs a fault evaluation, and for each type of fault makes available an output pin, from which the corresponding fault signal is amplified and transmitted to an electrical relay. The fault signal (FM, FM1 . . . FMn) is transmitted to the circuit configuration (SA, SA1 . . . SAn), and by means of logic operation with the action of a static standard signal and of a clock pulse signal (Clock Pulse) acts on the electrical relay, which is realized in the form of a bistable relay (RB, RB1 . . . RBn) the contact system of which corresponds to a make function or a break function, depending on the signal status of the standard signal.