Security device for the switching off of a safety device is operated in the safe operation

摘要

The invention relates to a fuse (1) for the switching off of a safety device is operated in the safe operation during the occurrence of an overcurrent occurs in one of its load current lines (2). In order to - the response and release behavior of the invention to provide a controllable, for example, in order to rapid automatic circuit breakers or fuses to implement and the development complexity to be kept low, it is proposed that, in the load current line (2) a current measuring device (14) with a current sensor (7a) is provided, which, with a software-controlled controller (15) is connected, the means is switched off, when according to a predetermined criterion with at least one via current threshold value (15a, 15b) an overcurrent flows that on the current sensor (7a), in addition, a hardware control (10) is connected, the at least one of the controller (15) by means of hardware by means of adjustable current threshold value (12a, 12b), when it is exceeded, the hardware control (10) is immediately a switch-off signal is generated which, in which the safety device is switched off, and that on the hardware control (10) is a testing device (17) is connected, through which an overcurrent spinning.