Rockwell Automation has introduced a solid-state cable pull switch, through its Allen-Bradley brand. Guardmaster Lifeline 5 has a microcontroller inside and compensate for thermal expansion and cable sag. “Because the Lifeline 5 cable-pull switch is a solid-state switch, there is no mechanical wear that is often associated with traditional switches,” claimed product manager Steve Tambeau. ...
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from Electronics Weekly https://www.electronicsweekly.com/news/products/emech-enclosures/cable-pull-switch-solid-state-2017-07/
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