| 摘要 |
Fuse link status indicator for a low-voltage high-power fuse, according to the invention, relates to the design of low-voltage high-power fuses, or, to be more specific, to the solution of its integral assembly which gives a visual indication of the state of the fuse link within the cartridge of the fuse, that is, reliably concluding whether the fuse link is blown or not. The substance of the invention contains the fact that the force FP for displacing (3.9) the indicator lamella (2.1) along the channel (3.8) for the indicator lamella from the start, which reflects the state of the blowing of the fuse link (3.1) of the fuse not having occurred, to the final position which the indicator lamella (2.1) occupies in the state when the blowing of the fuse link (3.1) of the fuse has occurred, is produced by the compressive spring (4.1) located in the lower part of the channel (3.8) of the indicator lamella, in such a way that the compressive spring at one of its ends is leaning against the lower cover (1.2d) of the fuse housing, and the other end is pressing against the lower front edge (3.10) of the indicator lamella and acts to it with the required force attempting to push it from the starting to the final position, whereat the indicator lamella (2.1) is shaped so that at the appropriate place through the entirety its thickness dL (5.1) a breach (4.2) is made, which is, relatively to the shape, size and location of the indicator opening (1.6) in the frontal part of the front wall (3.6) of the housing/mantle (1.1) of the fuse, of such shape and size, and so located at the indicator lamella (2.1), that in the final position of the indicator lamella (2.1) such coincidence is achieved of the breach (4.2) and the indicator opening (1.6) due to which through the indicator opening (1.6) in the fuse mantle wall, not a single part of the indicator lamella surface be visible (2.1) nor any part of the compressive spring (4.1). The design of the indicator assembly according to the invention concerned offers the possibility of the indicator lamella (2.1) being made of thermoplastic material of any desired colour using injection technology. As to the state of the fuse link (3.1) of the fuse, it may also be additionally concluded, based on the fact that at the final position of the indicator lamella (2.1), which may be realized by injecting the thermoplastic material of a desired colour, that its part that is the surface (6.1) next to upper front edge (3.11), becomes visible, so that in this position, the surface (6.1) protrudes above the upper cover (1.2g) in the fuse mantel wall, additionally showing/indicating that the fuse link (3.1) of the fuse is blown. The indication and reporting on the state of the fuse link in the cartridge of a fuse is also achieved through an additional feature of the indicator lamella (2.1) which acts, as a moveable part, on the microswitch (11) which is located on and fixed to the upper cover (1.2g) of the fuse housing in such a manner that the indicator lamella (2.1) moving from the starting to its final position shifts the acting lever (11.3) of the microswitch (11) from the free to the compressed position, which is followed by the switching of the selected contact circuit, while in its starting position the indicator lamella (2.1), acting lever (11.3) of the microswitch (11) naturally occupies a free position.
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