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What do the acronyms N/O , N/C and C/O mean ?<br /><br /><br />

These are typical European Union acronyms . N/O indicates a Normally Open ( N.O.) contact that is single throw . N/C indicates a Normally Closed ( N.C.) contact that is single throw . C/O indicates a Changeover contact ( often noted as a Form C contact ) that is double throw to open and closed positions .

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