Overview
LV HRC fuses are used for installation systems in non-residential, commercial and industrial buildings, as well as in the switchboards of power supply companies. They therefore protect essential building parts and installations.
LV HRC fuses are fuse systems designed for operation by skilled personnel. There are no constructional requirements for non-interchangeability of rated current and touch protection.
The components and auxiliary equipment are designed in such a way as to ensure the safe replacement of LV HRC fuses or isolation of systems.
LV HRC fuse links are available in the sizes 000, 00, 0, 1, 2, 3, 4 and 4a.
LV HRC fuse links are available in the following operational classes:
gG for cable and line protection
aM for the short-circuit protection of switching devices in motor circuits
gR or aR for the protection of power semiconductors
gS: The new gS operational class combines cable and line protection with semiconductor protection.
LV HRC fuse links are mainly used in LV HRC fuse bases, LV HRC fuse switch disconnectors, LV HRC fuse strips as well as in LV HRC in-line fuse switch disconnectors.
LV HRC signal detectors are used for remote indication that the LV HRC fuse links have been tripped. Three different solutions are available:
3NX1 021 signal detectors with signal detector link 3 The LV HRC signal detectors with signal detector link support monitoring of LV HRC fuse links with non-insulated grip lugs of sizes 000 to 4 at 10 A or more. The signal detector link is connected in parallel to the LV HRC fuse link. In the event of a fault, the LV HRC fuse links are released simultaneously with the LV HRC fuse signaling link. A tripping pin switches a floating microswitch
3NX1 024 signal detector top:
The signal detector top can be used with LV HRC fuse links, sizes 000, 00, 1 and 2, which are equipped with non-insulated grip lugs and have a front indicator or combination alarm. It is simply plugged into the grip lugs
5TT3 170 fuse monitors:
If a fuse is tripped, the front indicator springs open and switches a floating microswitch. This solution should not be used for safety-relevant plants. For this purpose, we recommend our electronic fuse monitors.
LV HRC fuse links with combination alarm signal the tripping of a fuse by a clear color change from red to white. This enables fast identification and replacement of the tripped fuse links. This increases plant availability.
The insulated grip lugs made of metal are integrated in the top and bottom covers of the fuse link in molded plastic and provide greater safety when replacing. The mark shown below indicates that the grip lugs are insulated
In the standard series with front indicator, the front-mounted red indicator signals the tripping of a fuse.
LV HRC fuse links are always equipped with silver-plated contact blades. This means that they are non-corroding and have less contact resistance. This ensures the long-term operational safety of the plant.
Uniform solution for all sizes - LV HRC signal detectors reliably indicate when a fuse has tripped. Tripped fuses are quickly located. This saves time and increases plant availability.
The LV HRC signal detector top is a cost-effective solution for the monitoring of Siemens LV HRC fuse links of sizes 000, 00, 1 and 2.
The silver-plated Lyra contact provides a large contact area for the contact blade of the LV HRC fuse link. This improves heat transmission and lowers the temperature. It also minimizes aging of the fuse link in the maximum load range, in particular when using SITOR fuses The large contact area also facilitates replacement of LV HRC fuse links.
The large contact area also facilitates replacement of LV HRC fuse links.
The spring washer that tensions the contact is mechanically galvanized. This prevents hydrogen embrittlement. The contact is resistant to aging and there will be no dreaded annealing of contacts, which considerably improves operating safety.