This is best choice for overcurrent protection of North American countries.
These breakers comply with American UL standard and Canadian CSA standard, and are listed by UL. These breakers are suitable for a feeder or a branch circuit protection.
This kind of breaker comply with UL 489 and CSA C22.1No.5.
This kind of breaker comply with UL 1053 and CSA C22.1No.144.