| 摘要 |
According to the invention, the common control device (<bold>26</highlight>) for the power and interconnection contactors (<bold>9, 10, 11</highlight>) is a programmable computer operating according to a truth table, without prior checking of the state of said contactors, and, with each interconnection contactor (<bold>11</highlight>) there is associated a device (<bold>25</highlight>) able to prevent the closure of said contactor if its contact terminals (<bold>11</highlight><italic>a, </highlight><bold>11</highlight><italic>b</highlight>) are simultaneously energized.
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