Differences between 220pf 1000V capacitors
Any cap might replace this one rated for 1kV 100 220 pF but NP0/C0G are best for ESR and temp stability.  However, I would have chosen 3kV.


It takes a poor design, unusual conditions or a  defective kV rated part to blow a 100pF cap which cannot store much energy (50 uJ) due to small capacitance.  Possibly a secondary failure next to another. 


Normally line filters should attenuate peak voltage surges.

Where used, may be  important to know but for AC power maybe not. 


If used with SMPS possibly for PFC compensation  filter at 1.4 * line Vrms. .

To improve reliability, choose a cap with 3kV rating which is more standard for consumer grid impulse protection, but in truth , Power meters have only arc gaps rated for 6kV and external lightning protection is above this.  This ionization takes a 1us or so to trigger.  


Opinion

This means all the electronics in Florida will fail unless that device has a good line filter to reduce peak voltage below cap ratings.  Or it means this why why Floridians and Mariners unplug their sensitive electronics before a lightning storm when they should be getting better line filters and OVP.  (next to central Africa, Florida has one of the highest lightning strokes / year.)



This is a much better part but expensive, which is why it was not used.($1 /10k)

The part see rapid discharges and is used as an EMI snubber so is under very high stress as I expected.

So choose 220 pF 3kV (low ESR)