You should always understand how a relay element works before you test it. Relay instruction manual sizes are out of control and design engineers often don’t notice that the relay manufacturer has changed definitions or functionality between models or firmware revisions. You are the last line of defense, and you are the only person in a position to find these mistakes. But you won’t find them by reprogramming the relay. Let’s look at what we can do to truly understand how a relay applies it’s protective elements.
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