Switch-off device for airport series circuits
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United States of America Patent
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Sep 14, 1999
Grant Date -
N/A
app pub date -
May 18, 1998
filing date -
May 16, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A switch-off device for airport series circuits (2) has input terminals (3, 4) which are connected to a current source (1). It also has output terminals (5, 6) which are connected to a series circuit (2) and connecting elements (7, 8) by means of which the input terminals (3, 4) and the output terminals (5, 6) can be connected to one another. The switch-off device has an actuator (11) for the purpose of simplifying operation and permitting a plurality of different, clearly visible operating states. In a normal position, the actuator positions the connecting elements (7, 8) such that each input terminal (3, 4) is connected to an output terminal (5, 6). In a service position, it positions the connecting elements (7, 8) so that the input terminals (3, 4) are disconnected from the output terminals (5, 6) and are connected to a grounding terminal (9), while the output terminals (5, 6) are connected to one another and to the grounding terminal (9). In a testing position, the actuator positions the connecting elements (7, 8) in such a way that the input terminals (3, 4) are disconnected from the output terminals (5, 6) and are connected to the grounding terminal (9), and the output terminals (5, 6) are connected to one another and to a test terminal (10).
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