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Application filed by Gebr. Berker Und Firma Albrecht JungfiledCriticalGebr. Berker Und Firma Albrecht Jung
Application grantedgrantedCritical
Publication of AT196488BpublicationCriticalpatent/AT196488B/de
H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
H01H83/02—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents
H01H83/04—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents with testing means for indicating the ability of the switch or relay to function properly
