Electricity: electrical systems and devices – Safety and protection of systems and devices – Feeder protection in distribution networks
Reexamination Certificate
2006-10-31
2006-10-31
Jackson, Stephen W. (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Feeder protection in distribution networks
Reexamination Certificate
active
07130171
ABSTRACT:
An apparatus for failsafe disconnection of an electrical load has a first and at least one second safety switching device. The first safety switching device has a first evaluation and control unit, an output and an electronic switching element, for producing a potential-related switching signal at the out-put under the control of the first evaluation and control unit. The second safety switching device has a second evaluation and control unit and an input. The input and the output are connected to one another via a single-channel connecting line, and the input supplies the second evaluation and control unit with the potential-related switching signal from the output of the first safety switching device. In order to fulfill safety standards for such kind of apparatus, the second safety switching device has at least two input circuits to which the potential-related switching signal from the output of the first safety switching device is supplied in a mutually redundant manner.
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Ehrlich Gerhard
Pullmann Juergen
Jackson Stephen W.
Pilz GmbH & Co.
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