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3668471
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Information
Patent Grant
3668471
References
Source
Patent Number
3,668,471
Date Filed
Not available
Date Issued
Tuesday, June 6, 1972
52 years ago
CPC
H02H3/33 - using summation current transformers
H02H3/08 - responsive to excess current
H02H3/10 - additionally responsive to some other abnormal electrical conditions
H02H3/105 - responsive to excess current and fault current to earth
H02H3/13 - for multiphase applications
US Classifications
361 - Electricity: electrical systems and devices
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