Safety fuse cartridge

Details Safety fuse cartridge Safety fuse cartridge

1984-02-02

1985-07-02

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337266, H01H 8532

Patent

active

045271437

ABSTRACT:
A safety fuse cartridge having only a single through-bore necessary in a porcelain body that forms an inner chamber in which a fuse wire, which is embedded in a bed of sand in the chamber, extends between a lower contact base and an upper contact head. The cartridge is provided with an indicator which includes a glow lamp that is connected in parallel to the fuse wire via a high-valued resistor which is also embedded in the same bed of sand. The high-valued resistor can be surrounded by a sleeve or tube of insulating material, especially a tube of silicon or steatite. The resistance value of the resistor is preferably 500 to 1000 megaohms.

REFERENCES:
patent: 4149067 (1979-04-01), Jager

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