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Device for monitoring a space by series-connected normally-open contacts, in particular cover interlock switches in a security enclosure

  • US 8,461,990 B2
  • Filed: 11/27/2008
  • Issued: 06/11/2013
  • Est. Priority Date: 11/29/2007
  • Status: Active Grant
First Claim
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1. Device for monitoring a space by varying a sequence of a series connection of normally-open contacts, in particular of cover interlock switches in a security enclosure, comprisinga series-connection variation device;

  • a security cover;

    at least two normally-open contacts; and

    a protective circuit;

    said at least two normally-open contacts each having an open, electrically non-conducting state and a closed, electrically conducting state;

    said security cover being configured to shift each of the at least two normally-open contacts into a closed, electrically-conducting state in each case;

    said protective circuit being configured to detect an opening of at least one of the at least two normally-open contacts;

    said series-connection variation device connecting in series the at least two normally-open contacts;

    it being possible to vary the sequence of the series connection of the at least two normally-open contacts by the series-connection variation device.

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