On Wed, 21 Mar 2018 16:14:02 GMT, AC GOD
m wrote:

replying to Wade Lippman, AC GOD wrote:
The 2 main differences between a square D hvac breaker and a standard square D
QO series breaker is The way it mounts. A standard breaker is powered through
the mounting clips and sends power through lugs .. HVAC breakers have lugs
for incoming power on bottomband lugs or spade blades on top to distribute
power. These are typicslly found on air handlers with heat strips and are used
instead of fuses..

You are confusing HCAR rated breakers and QOM breakers that bolt to
the bus. Any breaker can be backfed if you use the supplemental
retainer clip (or a screw in some styles)