Siemens Aktiengesellschaft

Werner Krämer

Martin Meinke

Bernhard Wiesgickl

Klaus Indefrey

Manfred Prölss

Paul Fröhlich

Gordon Schumann

Bernhard Neumann

Christian Braune

Patrick Gehlen

In order to provide a bearing for an already prepositioned switching shaft, fitted with coupling levers, of a low-voltage circuit breaker in the region where the switching forces act, a bearing assembly is provided. The bearing assembly includes a bearing body which is mounted on the housing front wall of the switch pole, surrounding the switching shaft in the form of a half shell. The bearing body includes a subregion which projects between two coupling levers, which are at a distance from one another and are connected to a movable switching contact. It thus forms side guide surfaces for the coupling levers. Such a bearing assembly can be arranged in both the end regions of the switching shaft in multipole circuit breakers.

Actuator unit with at least two actuators and a secure control unit

An actuator unit includes a base actuator and an additional actuator, via which a useful circuit can be opened and closed. Given proper functioning, the base actuator can be activated by supplying electric energy and deactivated by not supplying electric energy. The additional actuator can be deactivated by supplying electric energy and can be activated via manual operation. A control unit deactivates the additional actuator only when an actual activation state of the base actuator differs from a desired activation state of the base actuator.

Actuator unit with a base actuator an additional actuator and control unit

Data transfer between a secure computer and a number of input/output units occurs via a bus control unit connected to the secure computer and a serial bus system. The bus control unit cyclically activates the input/output units connected to the bus system and transfers multi-bit message to the respective activated input/output unit. In order to produce a data transfer method which enables security/related signals to be transmitted via a non-error-protected bus system, at least one of the input/output units is designed as a security unit. Further, the multi-bit message transferred to the security unit has at least one checkbit. The security unit interprets the transferred multi-bit message as correct only if the checkbit alternates within a predefined monitoring period.

Error protected data transfer system and method

An arrangement includes two series-connected switching contacts in two contactors. The tripping signal thereof is generated with a variable time offset so that the number of disconnection processes and connection processes, which are carried out first in time, are virtually the same during lengthy use.

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Schwandorf, Germany

Werner Krämer