Can you be more specific ?
Is it on the 12 V or the 120 Volt side off the panel ?
Is it the main breaker ( switch ) or a branch circuit ?
"Reset" makes me think of a main breaker or overload that, if tripped, could be .... reset.
If it ain't tripped, leave it be.
A picture is always helpful.
My panel has 2, 120 volt "mains", one 12 volt "main" and a generator " main" breaker on it. all can be reset if tripped.