What does the suffix AA mean on PowerPacT breakers?

The need to understand the meaning of suffix -AA in a Powerpact breaker

Powerpact Circuit Breakers

The circuit breaker with an AA suffix has a 1a1b auxiliary switch. For field installable part number use:
B-Frame - LV426950 or LV426951 (pre-wired)
D, H, J, M, L, P, and R-Frames - S29450

Note: Not available on electrically operated P-frame.