Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Patent
1989-10-06
1991-07-16
Jennings, Derek S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
361 91, 361118, 361127, H02H 320
Patent
active
050329464
ABSTRACT:
Surge suppression is provided by varistors connected between, respectively, hot and neutral conductors and hot and ground conductors, each through a common fuse that avoids hazardous overvoltages on the varistors. A first indicator circuit portion provides an indication that the power is on and surge protection is present and includes a first indicator device such as a green light-emitting diode that is energized when the fuse is intact, and a second indicator circuit portion is provided for indicating power is on and surge protection is lacking that includes a second indicator device such as a red light-emitting diode that is energized by the line conductors when the fuse has been interrupted. The surge suppressor and dual indicator apparatus can be contained within a wiring device such as a receptacle. A single varistor unit containing two varistor disks with three leads, including a center tap, allows three effective surge suppressor circuit branches in a compact configuration.
REFERENCES:
patent: 4023071 (1977-05-01), Fussell
patent: 4212045 (1980-07-01), Martzloff
patent: 4439807 (1924-03-01), Reitz
patent: 4688135 (1987-08-01), Leopold
patent: 4979071 (1990-12-01), Ito et al.
Misencik John J.
Wiley Roy O.
Jennings Derek S.
Telfer G. H.
Westinghouse Electric Corp.
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