The side armor and side ERA on the T-90M seems to overperform.
200 mm of kinetic and 600 mm of chemical is diabolical for a 20 mm block at beast.
I have shot the T-90M’s side under many angles and a lot of the time, the ERA was able to either eat the whole round or redirect it under an angle, reducing it’s penetration.
Most recently, I have shot the T-90M for an angle that would otherwise penetrate and damage any other MBT.
The KE-W APFSDS round wasn’t effected much by the ERA yet, when entering the crew compartment, the spall liner made the whole APFSDS and subsequently all the created spall dissapear.
This isn’t a very rare scenario, I was just fed up at the moment, I had to post it somewhere.
In the very unlikely case that the T-90M has actuall 200 mm of kinetic side protection, the ERA blocks should be modelled with more depth and accounted for this depth when calculating it's protection at any given time.