Series breaker panel box
Does this mean that since the panel circuit is series I can connect the source hot wire to the 60-amp breaker and all other breakers will automatically be connected to the 60-amp breaker?


The panel bus bars are two separate circuits that can be fed with a two pole breaker. The bus bars are not in series with each other. As you have proposed, a 60 amp two-pole breaker inserted into the panel can be used as the main breaker if it is fed from your main panel. The other two-pole breakers will draw power through the 60 amp breaker.

I notice there is no neutral or ground bars in this panel. If you are in Europe this may be OK but in the USA these need to be added to the panel and the neutral bar needs to be insulated from the panel.

Good luck!