Скачать или смотреть How Trapped Key Interlocks Works 2

It is called "Trapped Key" as it works by releasing and trapping keys in a predetermined sequence. As an example, after the control or power has been isolated on a machine, a key is released that can be used to grant access to individual or multiple doors OR after a switch disconnector has been opened in an electrical interlock scheme, a key is released to enable an earth switch to be closed and applied.

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