INDICATOR ASSEMBLY FOR REMOTE ELECTRICAL SIGNALLING OF FUSE ELEMENT STATUS OF LOW VOLTAGE HRC FUSE LINKS

摘要

The indicated technical problem has been technically resolved in this invention with an indicator assembly for remote electrical signalling of fuse element status of low voltage HRC fuse link where a part of the separate signal generation circuit, including a micro switch fixed on the micro switch holder, is installed on the fuse link in the manner to ensure that switching, i.e. closing or opening of the micro switch contacts occurs just at the moment of the fuse element blowing, thus allowing that a reliable information as to whether the fuse element of the fuse link has blown or not is provided by this signal generating circuit, which comprises the said micro switch and which is under certain voltage. The overall dimensions of the micro switch holder with the micro switch fitted in it are such that the installation of the indicator assembly on the low voltage HRC fuse links is possible without the need to change the usual methods of use and installation of fuse links as applied when such indicator assembly is not installed. According to the e solution of the said technical problem, the rated current and voltage of the switching contact and thereby of the signal generation circuit, amount to 5 A at U = 250 VAC, being the most commonly available values that are used at the place of installation of low voltage HRC fuses as well as for the signal generation and auxiliary power supply circuits Besides, the part of the indicator assembly designed for remote signalling of the fuse element status can be either factory installed on or removed from the low voltage HRC fuse links or directly by the fuse user, at any time following the installation of the fuse at the point of operation.