In your professional opinions, what company makes the best quality 3-phase monitors altogether? Why do you feel this way? What could they do to make a better one? Are the prices decent in your opinion? Please feel free to elaborate. Thanks!
Only ever used Siemens phase loss monitors. They managed to do their job. Siemens is a pretty good bet most times.
Lets face it... these days it's pretty much the same thing with all of the major manufacturers. If you get a device that has no flaws, it will do its job to the end of its designed life span and often times for much longer. Get a dud and it will die on you.
As the saying goes... "You pay your money and take your chances".
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Joe Contractor to Electrical Inspector, "What do you mean you are going to make me follow the code?".