What does an F40 or an F60 suffix on the end of a D-frame breaker indicate?
PTCCB - MCCBS,EARTH LEAK&SWITCH
F40 and F60 suffixes indicate a breaker frame (400A or 600A) with no trip unit. This breaker could be mounted and wired, and the trip unit could then be chosen and installed at a later date.
Cross to a Powerpact L frame - also has "frame only" option.