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Publication of DE296463CpublicationCriticalpatent/DE296463C/de
H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
Frequenzrelais, insbesondere zum Steuern von Schaltern o. dgl., mit wenigstens zwei auf raeumlich getrennte Teile eines beweglichen Leitergebildes einwirkenden Magnetpolen, von denen wenigstens der eine ein Pol eines Wechselstrom-Elektromagnets ist