Siemens Aktiengesellschaft

Jeffery C Mizener

Michael Hahn

Henry Franke

Andreas Pancke

Holger Hochgraef

Aron-Ernst Musiol

Gerhard Tietz

Ilka Redmann

Hans Rehaag

Manfred Schiller

Michael Jankowiak

A protective device is disclosed having a circuit breaker for an electrical connection between a transformer and a load, wherein an overcurrent device is arranged between the transformer and the load. The overcurrent device has first magnetoelectric transducers arranged at each phase conductor and the neutral conductor, wherein the overcurrent device uses the transducer currents to in each case establish the presence of a first ground-fault current, and wherein the circuit breaker has a switching device, which interrupts at least the phase conductors between the transformer and the load in the event of the presence of a first ground-fault current (unrestricted earth fault). In order to also be able to determine the ground fault current between the transformer and the circuit breaker, at least one embodiment of the invention proposes providing in each case second magnetoelectric transducers at each phase conductor, the neutral conductor and a star-point conductor which is connected to the star point, using the transducer currents of the second transducer in each case to determine the presence of a second ground-fault current (restricted earth fault), and forming a signal for disconnecting the transformer in the event of the presence of a second ground-fault current.

Protective device having a circuit breaker, in particular a low-voltage circuit breaker

Data memories are used to represent the characteristic values of the properties of the circuit-breaker and the associated current transformer. A cable harness uses a writeable electronic memory module which is inserted into one of the interconnecting cables between the current transformer(s) and the overcurrent trip as the data memory.

Low-voltage circuit breaker comprising a data memory

A remote service system for a circuit breaker fixed in a remote allocation. Remote service is provided by any station that can be accessed through a communication network. The system is provided, on one side, with a diagnostic hand-held apparatus which is dedicated to a switch service and should be connected, if necessary, to a circuit breaker, through a connecting unit provided to that end, and on the other side, with a telecommunication interface for exchanging a data through a telecommunication network.

Circuit breaker remote service system

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Sidney, OH, United States of America

Jeffery C Mizener