The socket is keyed so there's no chance of any reverse polarity accident occuring if I ever need to use my jump start battery pack but I need to protect that cable run from any sort of accident resulting in a short-circuit, so I bought a 12V circuit breaker rated at 30A (the computers draw less than 20A to get the hybrid system to the 'READY' state).
My question is - the circuit breaker has one connection labelled as 'Line' and the other one as 'Load', so is there anything in there that means it will only operate with current flowing in that direction?
The wires from the battery to the socket will have a permanent 12V supply on them. If I were to plug anything into that socket then current would flow from battery to socket. However, it's purpose is to do the reverse and provide 12V from an external source to the flat battery so current flow would be from socket to battery, so will the breaker work 'going one way' as an overcurrent device in case of a fault but also allow current flow in the opposite direction when/if needed?
Or should I just put a 30A in-line fuse in instead of the breaker?