I will like to give you a head up with the Pushmatic breaker if you have to replace the P2100 breaker which it is a common main breaker used in the resdential load centre.
You may want to check it ahead of the time to see if have in stock if not many case it can be backlogged for a while [ the company will make so many of #'s a batch only ] and slowly dropped out of market so if you have P2100 breaker keep it on your shelf it will come handy pretty soon.
I ran into the pushmatic's at least twice a year.
{ P260 and smaller is pretty easy to find but getting more pricier when time go by }
Merci, Marc