High-voltage back-up fuse rated 25 A at up to 24 kV AC 50 Hz with 63 kA breaking capacity, 442 mm long by 53 mm diameter, air-installation per DIN and IEC 60282-1 (back-up category, no striker). Used on the primary side of distribution transformers to interrupt short-circuit currents. Typical applications include ring-main units, transformer switchgear, and MV distribution cabinets in industrial and utility networks. Country of origin: Germany.