Siemens Aktiengesellschaft

Dirk Graupner

Christian Hammer

Reinhard Schmid

Werner Olbrich

Nico Wohlrab

Timon Meier

A protective switching device is disclosed for monitoring the electrical current flow to an electrical user, including a switching functionality, an excess current triggering functionality and a short circuit triggering functionality. In at least one embodiment, the protective switching device includes a first microcontroller with a first input signal filter, wherein the first microcontroller is configured for monitoring the excess current triggering functionality and wherein a second microcontroller is provided with a second input signal filter that is configured for monitoring the short circuit triggering functionality, wherein the two input signal filters are designed differently, and wherein the switching functionality is provided in one of the two microcontrollers. A method is further disclosed for monitoring the electrical current flow to an electrical user by way of a protective switching device.

Protective switching device for monitoring the electrical current flow to an electrical user and method for monitoring the electrical current flow to an electrical user by way of a protective switching device

A sensor unit is disclosed with a safety system for use with a signal generator, where at least one evaluation unit is provided for evaluating a signal from a sensor and for producing a first trigger signal based on the signal. In at least one embodiment, a more compact and less expensive version of a sensor unit is provided, which operates reliably under high safety demands. In at least one embodiment, this is achieved by a safety system which has a checking unit for checking the operation of the evaluation unit using a test signal. The test signal is processed by the evaluation unit in the same way as the signal from the sensor. The two-channel output is provided on the basis of a conclusiveness check in the checking unit.

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Meerane, Germany

Dirk Graupner