| This was a vacuum switch. It used two coils (on the inferior part), one closed the contact and the other, the central, helped it to open very fast, in order to avoid a bigger damage when there was an overload. Photo given by EA4CZS |
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| This was a vacuum switch. It used two coils (on the inferior part), one closed the contact and the other, the central, helped it to open very fast, in order to avoid a bigger damage when there was an overload. Photo given by EA4CZS |
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