|Toyo, what kind of relay would you recommend for that type of setup? The relays I have for lights are individual 30A units but I have a separate one for each light location. With the BlueSea block, you could potentially run much more than 30A through it so wouldn't you need a much bigger relay that could handle whatever you plug into the block?|
What are you wanting to power from the Blue Sea block? If you are wanting lights to come on only when the key is hot, just wire their relays to the switched circuit and bypass the BlueSea block.
If there are other high current accessories that you want to be powered through the BlueSea block then yes, you would need the relay to be able to handle the full amount of current pulled from all branch circuits off the block. The 40A "Bosch style" is the most common type automotive relay. You can parallel them to allow for current sharing. I have found that the spade connectors heat up do to the contact resistance. So for anything close to 40A i would run two in parallel.
There maybe other type relays with a higher current rating that you could substitute, but i am not familiar with any in particular.