As title mentioned, why too large common mode voltage can damage a device? Especially an instrument amplifier?
In the diagram below V1 is the common mode voltage
You would expect VOut to be 0V (in an ideal amplifier) because its inputs are at the same potential (being connected together). In fact the op-amp will probably just catch fire, because the common mode voltage is way higher than the supply voltage and well outside the specification for common mode voltage for (most) real world devices