Applies to proximity devices with an enhanced resistance to failure (PDF) It specifies requirements for four different types of PDF.
IEC 60947-5-3 Ed. 1.1 b:2005
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Low-voltage switchgear and controlgear – Part 5-3: Control circuit devices and switching elements – Requirements for proximity devices with defined behaviour under fault conditions (PDF) CONSOLIDATED EDITION
International Electrotechnical Commission , 04/06/2005
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