1. Low melting point
  2. Low conductivity
  3. High melting point
  4. High resistivity
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1 Answers

Option 1 : Low melting point

The material used for fuse elements must have the following properties:

  • Low melting point
  • Low ohmic loss
  • High conductivity (or low resistivity)
  • Low cost
  • Free from detraction


:

  • The material mainly used for fuse element are tin, lead, silver, copper, zinc, aluminium, and an alloy of lead and tin
  • An alloy of lead and tin is used for small current rating fuses
  • For current exceeding 15 A, this alloy is not used as the diameters of the wire will be larger and after fusing the metal released will be excessive
  • Beyond 15 A rating circuit, copper wire fuses are employed
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