Safety switching apparatus, in particular for the monitored switching on of an electrical and/or electronic load

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12235320
APP PUB NO 20230358807A1
SERIAL NO

18142439

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Abstract

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A safety switching apparatus for safely switching on an electrical load includes for this purpose, the functionality of two non-forcibly guided changeover switches and, in particular, their normally closed contacts, which can be monitored during a starting process without using a microcontroller. The normally closed contacts are each arranged in a separate diagnostic circuit, which are connected in parallel with respect to a test voltage. The diagnostic circuits are each monitored by a diagnostic current detection device. The excitation coils of the changeover switches can each be short-circuited via a short-circuit device if a diagnostic current continues to flow in the respective diagnostic circuit for a predetermined time period after an activated starting process.

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Patent Owner(s)

  • PHOENIX CONTACT GMBH & CO. KG

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Franke, Felix Bad Pyrmont, DE 1 0
Peter, Henry Einbeck, DE 4 25

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