Automated facilities commanded by industrial control cabinets rely on the components in those cabinets to work reliably even in the face of power variations. These components include local power supplies, PLCs, data loggers, networking and other communication equipment, and IO — which are all vulnerable to the detrimental effects of voltage surge.

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https://www.designworldonline.com/overvoltage-protection-in-the-control-cabinets-of-industrial-automation/