I need to replace my old panel now but I also have plans to add more circuits in the future. I suspect that I will need to upgrade my underground service from the current 100A to 200A in the next 5-10 years to accommodate the increased power demands of my future plans (hot tub, central air, etc.)
My question is simple. Can I buy a 200A rated loadcenter and swap the 200A main breaker for 100A to comply with CSA code (the main breaker can't exceed the maximum amperage of the service conductor - #2 aluminum btw)? This would allow me to install the original 200A breaker in the future once I finally upgrade the service conductor to 4/0 to allow me to draw 200A without having to buy another panel all over again.
If this is possible, which manufacturer/series panels support this "interchangeable main breaker" capability? (200A panels that can be downgraded to a 100A main breaker.)