PKT and PKN fuses are designed to protect high-voltage windings of power transformers and voltage measuring transformers from overloads and short circuits. They provide reliable equipment protection, preventing damage and ensuring stable operation of electrical systems.

Main characteristics of PKT and PKN fuses:

• PKT-6 and PKT-10: Intended to protect high-voltage windings of power transformers from overloads and short circuits. They are used in regions with moderate and moderately cold climates (U1 and UHL3 versions according to GOST 15150).
• PKN-10: Used to protect voltage measuring transformers. They have structural differences from PKT fuses due to lower operating currents.

Operating principle:

The protective function of fuses involves melting a calibrated wire (fuse element) in replaceable PT cartridges when the nominal current is exceeded. In the event of a short circuit, the fuse element melts almost instantly, and the electric arc is extinguished by filling the arc channel with fine-grained quartz sand, preventing equipment damage.

Completeness and installation:

The fuse set includes contacts, support insulators, and a high-voltage current-limiting PT or PN cartridge. Installation should be carried out ensuring the alignment of the holder clamps relative to the longitudinal axis of the cartridge, providing reliable electrical contact and preventing mechanical damage.