HACR breakers- why in US but not Canada?

[Jeff Greef]

Some residential AC unit labels call for HACR breakers, some don't call for them at all, and some say they are recommended. But the ones that really baffle me are the labels that say HACR in US only, not in Canada. I guess when a breaker goes north, it no longer trips at amperage surges, cause they're so laid back in the frozen wastelands, eh?

What gives? Why not in Canada?

 

[JohnJ0906]

Canada doesn't use the same Code or standards as the US.