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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83/00
Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
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H01H83/02
operated by earth fault currents
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H01H83/04
with testing means for indicating the ability of the switch or relay to function properly
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