Load center, QO, 1 phase, 12 spaces, 24 circuits, 100A convertible main breaker, NEMA1

I want to feed this with 50A breaker from another sub panel and use this boxes 100A breaker simply as a master cutoff switch. Will code allow that?

Square D QO112M100P 100A 120/240V 1phase Convertible Main Breaker Load Center, Plug-On Neutral, 12 Spaces / 24 Circuits, NEMA-1, Gray Manufacturer: Square-D / Schneider | Catalog # QO112M100P | Capital Electric Part # 1487930

Load center, QO, 1 phase, 6 spaces, 12 circuits, 100A fixed main lugs, NEMA1, gnd bar, surface cover, CSA

Load Center, Main Breaker, 100A, 12/12, 120/240VAC, 65kAIC, NEMA 3R Item #: 62139 Cat #: QO112M100RB UPC: 785901867876 Sign In or Register to view pricing and more. Documents & Guides Component Guide Cut Sheet Warranty Cut Sheet Technical Bulletin ...

SQD,Q1,2 Pole,100 Amps,240 VAC,Main,Top Feed,Square D,Schneider Electric,Q12100TF,Breaker,Molded Case Circuit Breaker

Square D QO120M100P QO Plug-On Neutral Lc N1 1-Phase MB 240V 100A Technical Description : Main Breaker, Convertible Type; 14.25 Inch Width X 3.75 Inch Depth X 17.92 Inch Height Size; 20 Max.

The photos seem to show a main included as well as the 2p 30a, and the 3x 1p 20a. However the descriptions do not mention the 100a main breaker being included. Is that part of the package?

Circuit breaker, PowerPacT Q, 100A, 3 pole, 240VAC, 10kA, I-Line, thermal magnetic, 80%, ABC QBA32100 Product availability: Stock - Normally stocked in distribution facility

Customers say the Siemens circuit breaker is easy to install and fits well in various panel types, including older models. Many appreciate its reliability and performance, noting that it effectively resolves issues like frequent tripping.