2.5 ton air handler and no heat kit
You will need some sort of disconnect at the unit. An integral breaker can serve as the required disconnect, BUT it will have to be properly mounted.
Usually that mounting is provided by the heat-strip assembly, with line/load lugs in the breaker(s) and DIN-rail mounting.
I doubt that you will be able to install a breaker in there without the aux heat strip assembly.
Simply mount an external disconnect (sometimes a double-pole wall switch will suffice) and direct-wire it from there.
Life is uncertain -- eat dessert first!!
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