What is the replacement main breaker in a SB348IR ?

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Issue:
Main breaker replacement in a SB348IR

Product Line:
Switchboard

Environment:
Speed-D

Cause:
Maintenance

Resolution:
The part number is a MJF36800.
The rating of the speed D board is 50KA at 480. 65kA at 240. The rating nameplate has information about the ratings of that speed d board at different voltages.