Fuses having suppressed voltage transients

Details Fuses having suppressed voltage transients Fuses having suppressed voltage transients

1985-07-01

1989-10-10

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 9, 361 58, 361 91, 337 4, 337 17, 337164, H02H 504

Patent

active

048736040

ABSTRACT:
A shunt device and a method are described for protecting electrical equipment when a fuse blows. The shunt device establishes a by-pass across the fuse for permitting a limited amount of current to begin to flow at a lower voltage than the fuse blowing voltage and before the fuse blows, thereby serving as a transitory relief valve for a portion of the current while minimizing or even substantially eliminating the inductive spike when the fuse blows. The shunt device is made of at least one pyrolyzed polyacrylonitrile (PPP) fiber having a selected switching voltage so that the PPP fiber switches to a low resistance state while the fuse is blowing. When the fuse and PPP characteristics are properly matched, the rate of change of the current with time is lowered, thus selectively decreasing the size of the voltage transients which occur after the fuse blows.

REFERENCES:
patent: 3484653 (1969-12-01), Takaoka
patent: 4577979 (1986-03-01), Kalnin et al.

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