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Relè Di Sicurezza E Contatti A Guida Forzata.

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qualcuno potrebbe spiegarmi il motivo per cui in determinati circuiti si usano i relè di sicurezza con contatti a guida forzata? Inoltre, mi piacerebbe capire il principio per cui, se i contatti NO non si aprono, quelli NC devono rimanere aperti?

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