A friend has a breaker box with Cutler Hammer breakers. in a 125 Amp
box

I saw some 20 and 40 amp breakers but no main breaker.
One of them is BR2020 for the 20 amp breaker.

Where is the main breaker located located?

Thanks,
Andy


*Anything is possible. As RBM said if there are six circuits or less no
main is required. Also as mentioned before the panel could be a split buss
and no main would be required for the entire panel, but the 40 amp breaker
could be the main for the lower half. You can remove the panel cover to see
if it is a split buss. If this is an older house it is possible that this
is a sub-panel and the main panel or main disconnect is located somewhere
else. It is possible to have the main disconnect at the meter location.
Where is this panel in relation to the electric meter? Is this a single
family house or a multifamily dwelling such as a condominium.?

I have a customer who has an older Cutler Hammer panel with circuit
breakers, but the main disconnect in the panel is a set of pull-out fuses.