Siemens Breakers

I need to pick up some breakers for a Siemens Three Phase 200A panel. I know they are bolt on but I am lost in the naming conventions of those for sale. I think I need a B breaker but not sure if it is BL or BQ or even what the difference is?? Siemens website doesn't seem to be too clear either. Does anyone know which ones i need !!! Thanks