Energy limiting oil immersible fuse

Details Energy limiting oil immersible fuse Energy limiting oil immersible fuse

1977-08-29

1979-03-27

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337158, 337292, H01H 8502

Patent

active

041468627

ABSTRACT:
An oil immersible current limiting full range fuse including a tubular housing, end caps hermetically sealed to each end of the housing and supporting a full range fuse assembly within said housing, the housing being filled with a granular arc extinguishing filler, the hermetic seal provided between the housing and the end caps is formed by a resilient gasket mounted at each end of the housing and epoxy adhesive provided in the end caps, the adhesive being displaced by the gasket on insertion into the space between the end cap and the outer wall of the housing.
A method for testing the hermetic seals for leaks which includes the steps of injecting sulfur hexafluoride into the housing, sealing the housing, confining the fuse in a closed space for a predetermined period of time and testing the atmosphere of the confined space to determine the presence of sulfur hexafluoride. The full range fuse assembly is provided with a pair of contacts at each end which are electrically connected to the end caps by induction heating after assembly. The tin element assembly of the full range fuse assembly is provided with a reinforcing glass roving sleeve.

REFERENCES:
patent: 2532078 (1950-11-01), Baxter
patent: 3840836 (1974-10-01), Link

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