why to tonguston fuse break with thorium oxide?
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A fuse is made of an alloy of tin (Sn) and lead (Pb) because it is important that the device acts (melts) without heating too much (so as not to produce fires or to heat nearby terminals or cables). This is only possible if the alloy melts at a moderate temperature.
The fuse acts by melting, and the components (tin and lead) that already have low melting temperature, form an alloy that has an even lower melting temperature (the eutectic temperature, 183 degrees celsius) when its composition is the so-called eutectic composition (this is why this alloy is well known as “60/40 soldering tin” which actually has 61.9 % in Sn and 38.1 % in Pb mass).
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