The purpose of this paper is to explore an influence of galvanic protection and PK2 fuse-base contacts on the heating of the PK 2 fuse-base.
In the first part a low voltage NH fuses with detail description of different types of NH fuse-bases, regarding the use, technical demands and type are described. Factors that have influence on heating of a NH fuse-base are presented. Parts of standard IEC 60269 that refer to heating measurement and also phisycal influence of electric current on heating are described.
In the second part a preparation of test samples and performance of heating measurements is presented. A desctription of measuring equipment used at the heating measurements and a detail description of test conditions are presented.
In the last part results of the NH 2 fuse-base testing are presented. Heating measurements were performed on PK 2 fuse-bases with C and S contact shape and different galvanic protection: silver, tin and nickel. Analyses of galvanic protection and contact force influence on heating of PK fuse-base were performed.
Fuse-base PK 2 is a NH fuse-base size 2 (400 A) consisted of ceramic body, metal plate and contacts.
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