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"Auxiliary" is a term that often infers less esponsibility or importance than a "Main" role in many instances. Movies and armed forces are two examples that come to mind where "failure" of the main role has much more severe consequences than failure of an auxiliary role. As we know, should the Main actor in a movie perform poorly, the movie becomes a box office flop; and with an army should the Main force be inadequate a battle or even the entire war may be lost.

In the above two examples, the auxiliary roles are highly important respectively, however neither can compensate for failure in the Main role. Conversely, specially designed auxiliary contacts on Isolators play an equally important role as the Main contacts when wired in series with parallel control and safety circuits.

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