Safety switching apparatus with switching element in the auxiliary contact current path
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 26, 2017
Issued Date -
N/A
app pub date -
Oct 2, 2014
filing date -
Apr 5, 2012
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A safety switching apparatus for switching on or off a technical installation has a failsafe control/evaluation unit with an input for receiving an input signal. The failsafe control/evaluation unit is designed to process the input signal in order to produce an output signal for switching on or off the technical installation at a defined output signal time. The failsafe control/evaluation unit has a first output for transmitting the output signal to an electromechanical switch. The electromechanical switch has an operating contact for switching a load circuit of the technical installation and has a positively guided auxiliary contact in an auxiliary contact current path. The auxiliary contact can be used to carry a current for checking the switching position of the operating contact. A switching element is arranged in the auxiliary contact current path. The failsafe control/evaluation unit is designed to produce a switching signal at a defined switching signal time which has a time gap relative to the output signal time. The failsafe control/evaluation unit has a second output for transmitting the switching signal to the switching element in order to selectively allow or disallow the current through the auxiliary contact current path.
First Claim
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Family
International Classification(s)
- 2014 Application Filing Year
- H01H Class
- 1313 Applications Filed
- 1191 Patents Issued To-Date
- 90.71 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 2 Citation Count
- H01H Class
- 20.21 % this patent is cited more than
- 8 Age
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