Method of manufacturing a ceramic composite insulator
DE536748C
Procedure for determining the fault location in three-phase systems
DE536908C
Short-circuit and earth-fault indicator based on differential action
DE553699C
Distance relay with a stroke-limiting setting system and a running system that moves in the opposite direction when working, as well as a start-up system
DE542767C
Electric switch with non-flammable, isolating extinguishing fluid
DE473111C
Process for the production of electrical insulating bodies
DE484860C
Selective protection device for electrical three-phase networks
DE497223C
Fuse with closed fusible link for motor protection
DE488809C
Protective device for three-phase systems
DE555907C
Mains protection device with jump relay
DE485608C
Earth fault relay for three-phase systems
DE453083C
Overvoltage protection device with spark gap and reduced discharge delay
DE522188C
Measuring device for alternating current to generate a measured variable that is only dependent on the frequency
