Patent classifications
H
ELECTRICITY
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H01
ELECTRIC ELEMENTS
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H01H
ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
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71/00
Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
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H01H71/04
Means for indicating condition of the switching device
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H01H2071/044
Monitoring, detection or measuring systems to establish the end of life of the switching device, can also contain other on-line monitoring systems, e.g. for detecting mechanical failures
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