High-power fuse “Swedish design" 24kV

Sub-field fuses - Back-up fuses are designed for short disconnection times in the event of arc failure on the low voltage side of the distribution transformers.
The fuses are intended as current limiting / short-circuit protection, which will trigger all currents between its maximum breaking current Imax (I1) down to the Imin (I3) value.
The fuses correspond to the requirements of the older Swedish test standard 17A- "Swedish fusing" through:

• The switch-off time is adapted to the rated current of the fuse (safe disconnection at 0.1s)
• The rated current of the fuse corresponds to the requirements of being greater than 1.1 times the rated current of the transformer.
• The fuses meet the requirements for the connection currents according to 17A.

The fuses are also dimensioned to allow the transformers to run with 40% overload for 2 hours. The fuses are tested and approved in accordance with current test standard IEC 60282-1 and VDE 0670 T4.
Dimensionally, the fuses meet DIN 43625 and are designed for use both indoors and outdoors. The low effect losses in the fuses make them suitable for use in encased switchgear. In these applications where cooling is reduced, the effect loss of the fuse should be considered when selecting rated current of the fuse. The fuses are lead- and cadmium free and equipped with striking pin, type medium 80 N (Newton). The entire range extends to 12 kV from 6A-160A and for 24 kV from 4A-125A. the fuses have clear marking with technical data and E-number to avoid mistakes as well as reinforced marking around the entire fuse body of the striking pin position. This marking simplifies post-checking of the mounting direction to ensure the function of the striking pin. The striking pin is activated either by melted melting conductors or via built-in temperature sensors.