Spiral wound sand fuse

A time lag fuse for high voltage-high amperage fault currents, comprising:

• a length of fiberglass yarn;
• a wire spirally wound around said length of fiberglass yarn;
• said wire and fiberglass yarn being packed in silicates and forming a portion of the circuit for the high amperage fault current;
• said wire, fiberglass yarn and said silicates being non-reactive during the fault current interruption.

A fuse, comprising:

• a tubular insulative body;
• end caps disposed on the ends of said tubular body having a solder coating thereon;
• a core of a plurality of woven strands of fiberglass extending between said end caps, said core being devoid of any sizing and binding material for the fiberglass;
• a base metal wire plated with tin, said base metal wire being spirally wrapped around said core and in conductive engagement with said solder coatings;
• arc quenching silicates disposed about said core and base metal wire within said tubular insulative body;
• and
• said fiberglass being chemically inert to tin in the presence of said arc quenching silicates whereby said core and tin plated base metal wire do not metallurgically interact when the fuse opens to leave an undesirable conductive deposit of carbon.