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But there is a silent assassin that destroys all that hard work:

Don't let a $50 surge destroy a $50,000 safety system. pl spd tool

We spend a lot of time calculating Performance Levels (PLr) for safety circuits under ISO 13849-1. We verify the Category, MTTFd, and DCavg religiously. But there is a silent assassin that destroys

Here is the hard truth: A lightning strike 100 meters away, or switching a heavy inductive load inside your plant, can generate a 6kV surge. That surge doesn't care about your safety rating. It will weld contacts, fry logic, and degrade sensitive semiconductors in your safety relays and PLCs. pl spd tool