If you have had some trouble in the past with compressors going bad, fan motors going bad, due to a leg drop or really bad imbalance, then I have a few suggestions for you. With storms and grid overload issues we will probably be faced with more and more of this issue. Take a look at the products below.

ICM450A- This is a 3 phase voltage monitor. This will monitor and record all faults. Also has the ability to be hooked up to control side of the contactor to shut unit down to prevent damage.
ICM450A+ - Programmable with phone
Also, surge protection...Just pick the right one for your application.
  

• ICM530  3 Phase Delta 240VAC or Wye 120/240VAC
• ICM531  3 Phase Delta 480VAC or Wye 277/480VAC
• ICM533  3 Phase Delta High Leg 120/240VAC