You should have received a wiring diagram along with the MCCB ? Each manufacturer has his own way of wiring, so one can't generalise.

In general, there needs to be a two-position selector switch for Auto / Manual selection. Only one mode of operation possible, since the selector switch will stay put in one position only.

The charging mechanism will have a freewheeling clutch in it somewhere, so that overcharging is not possible. There will also be a microswitch to cut off supply to the motor when charging is complete.

So, you see, it is quite complex and you need to scrupulously follow the wiring diagram.