Hmmmm …. does it have explosive reactive armour built in?
.
Short answer - Yes.
"The base armour of the M-55S is the same as the T-55 – a
maximum of 100 mm on the hull front, and 200 mm on the
turret. This is effectively tissue paper for modern main
battle tanks and anti-tank weapons, but the M-55S
received upgraded protection through the addition of
Israeli-designed explosive reactive armour (ERA)."
Read all about it -