Abstract: An assembly locking device adapted to a normalized standard or fine thread of a thread shaft of a thread bolt, so that the locking device is positionable in a loss-proof manner on the thread of the thread shaft. The locking device includes: a cylindrical turn comprised of a plurality of helically wound turns, of a wire, a transition turn and adjacent to the second end of the helix is a blocking turn which has a negative pitch PB compared to the holding turn, so that at least an end portion of the blocking turn is elastically displaceable in the axial direction of the central longitudinal axis between an insertion position and a blocking position. The end portion of the blocking turn forms the second end of the helix and in the blocking position is arranged radially outwardly of the transition turn and/or the holding turn.

Abstract: An assembly locking device adapted to a normalized standard or fine thread of a thread shaft of a thread bolt, so that the locking device is positionable in a loss-proof manner on the thread of the thread shaft. The locking device includes: a cylindrical turn comprised of a plurality of helically wound turns, of a wire, a transition turn and adjacent to the second end of the helix is a blocking turn which has a negative pitch PB compared to the holding turn, so that at least an end portion of the blocking turn is elastically displaceable in the axial direction of the central longitudinal axis between an insertion position and a blocking position. The end portion of the blocking turn forms the second end of the helix and in the blocking position is arranged radially outwardly of the transition turn and/or the holding turn.

Abstract: The present disclosure relates to a closure element of a drive means opening of a connection element. Further, the present disclosure relates to an installation holding element with a plurality of closure elements of the drive means opening of a connection element, wherein the closure elements can be installed manually without tool in the drive means opening of the connection element. For this purpose, the installation holding element comprises a holding element, a handle portion as well as a plurality of closure elements arranged at the holding element.

Abstract: The present disclosure relates to a closure element of a drive means opening of a connection element. Further, the present disclosure relates to an installation holding element with a plurality of closure elements of the drive means opening of a connection element, wherein the closure elements can be installed manually without tool in the drive means opening of the connection element. For this purpose, the installation holding element comprises a holding element, a handle portion as well as a plurality of closure elements arranged at the holding element.

Abstract: A method of, and apparatus for, detecting fault currents, such as short-circuits in electrical loads, especially at direct-current supply networks, wherein there is produced a current signal corresponding to the load current and compared with a reference value and when a difference signal appearing as a result of such comparison exceeds a threshold value such is employed as a triggering criterion. The rise or slope of the current signal is detected and the reference value is obtained by storing the value of the current signal present upon detection of a predetermined rise.

Abstract: A method for the detection of short circuits in electrical installations, in particular on railway contact wires, comprising generating a measuring signal dependent on the derivative with respect to time of the monitored current, comparing the measuring signal with at least one limit value, determining the time for which the measuring signal exceeds a limit value, comparing the time with a preset time interval, initiating indication of a short circuit when the time for which the measuring signal exceeds the limit value also exceeds the time interval, checking the measuring signal on the occurrence of a decrease following an initial increase and on the occurrence of a subsequent increase, and generating a blocking signal inhibiting indication of a short circuit as a function of the occurrence of such a subsequent increase.

Abstract: A method for the detection of short circuits in electrical installations, in particular on railway contact wires, comprising: generating a signal corresponding to the derivative with respect to time of the monitored current, comparing the generated signal with at least one limit value, indicating a short circuit if the generated signal exceeds a limit value, monitoring the behavior of the monitored current for the occurrence of a criterion indicating the probability of a short circuit, triggering a replica signal corresponding to the behavior of the monitored current from the movement of occurrence onwards as a function of the probability criterion, comparing the replica signal with at least one limit value, and indicating a short circuit if the limit value is exceeded.

Abstract: A circuit which compensates for interference signals when monitoring conditions such as overcurrents and the like in a larger network. The circuit includes a current-signal branch and a compensating branch, the latter fed with an interference voltage and containing a variable gain amplifier. Both branches of the circuit are coupled to a signal superimposing element in the form of a summing amplifier, the output of which is applied to a polarity comparator. The polarity comparator, which is three-state device, forms a portion of a feedback network for controlling the gain of the variable gain amplifier.