Your panel labeling indicates Challenger Type C breakers (or possibly Type A).
Those have been continuously made, by Challenger then Bryant then by Eaton's Cutler-Hammer brand. The key is, they are marketed as "BR type". But they are also marked type C.
And that is that.
What's wrong with bare Challenger Type C?
Nothing is wrong with the panel bus. However, Challenger cheated on their UL testing - their breakers do not work.
In the wake of that, BRyant acquired Challenger's bus design and continued it exactly as the Type BR. The "name change" from C to BR was to exclude defective "C" breakers from BR panels. However BR cross-listed their breakers type C, allowing them in Type C panels like yours. Clever!
What's wrong with MP type?
The Crouse-Hinds breakers are plainly labeled Type MP. That is one of the four major breaker types currently on the market:
- GE THQL
- Siemens MP (renamed to QP) (former Murray)
- Square D HOM
- Eaton BR/C (former Bryant and sold as Cutler-Hammer)
All of these types have similar form-factors, but different shapes of "bus stab". So they will roughly fit in each other's panels, but will not make reliable contact, and tend to suffer destructive arcing at the bus stab, because they are making corner contact instead of surface contact.
The Crouse-Hinds breakers are plainly labeled type MP, which we recognize to be a Murray/Siemens type, NOT compatible with BR/C buses.
Further evidence of that is next.
What about UL-Classified breakers?
UL has a procedure for brand X to certify a breaker for brand Y (competitor or obsolescent) panel. This category is called "UL-Classified" and are legal (satisfy NEC 110.2) when used as labeled.
In the 3/4" breaker lines, the only UL-Classified breakers on the market are Siemens QD and Eaton CHQ, both for Square D "QO" type panels.
In the 1" breaker lines, the only UL-Classified breakers are Eaton CL, which are Classified for a wide variety of older 1" panels including Murray and Crouse-Hinds.
So, Eaton's answer for Crouse-Hinds panels is their CL line, and not their BR line. Thus BR does not interchange with Crouse-Hinds.