Blue Sea is more powerful and the Fuse Block has multiple boards that allow you to have both powered and not powered items at the same time. Example: The Blue Sea can have 30 amp items each running through it for a total of 100 amps total. I have a 30 amp fuse running for the front heated seat and another 30amp running for the rear heated seat. 2-15 amps each being used for the Powerlet so I can plug in heated gear. Those 4 items require 90 amps. The Audiovox is a 5 amps fuse and the smart tire has a 3 amp fuse totaling 98 amps. I have my bi-Xenon light running directly to the battery and I also have 1 Powerlet running directly off the battery so I can use it to hook up to my battery tender/pwered tank bag/tire pump ect. I am pretty sure that the Fuse Block cannot handle this type of power but maybe someone can chime in and let us know for sure? Blue Sea does not have any Fuse Blocks that can have both powered and not powered items. In the end I needed the power. Here is a cut and paste from FuzeBlocks page.
How much current can the FZ-1 handle?
This isn't as straight forward as you might think. The FZ-1 has two separate current paths. One is for constant power and the other goes through the relay for switched power.
Each circuit can handle up to 10A (120W). The total amperage used via the relay (switched power) should not exceed 30A (360W). The total amperage on the constant side should not exceed 30A (360W). The total amperage for the entire FZ-1 should not exceed 30A (360W). However remember the constraints of the relay and each circuit. This allows most people to run a number of accessories. The place where you need to be careful is running halogen lighting or heated gear. You can run these types of devices but you need to know the amount of current they use before hooking them up. Anything that uses electricity will tell you how much power/current it consumes usually given in amps or watts. To get watts from amps just multiple 12V * amps (V*I=P). To get amps from watts just divide watts by 12V (P/V=I). We have a calculator on our site if you need help with calculating power or amps.
Why can't the FZ-1 handle more current?
Space and money. When designing the FZ-1 keeping it small was one of the main requirements.
We wanted to be sure that the FZ-1 fit into a small space. Well big current and small copper runs don't work well together. If you want to push big current you need a lot of copper. However a lot of copper requires a bigger board. So we tried to make a compromise between size and current handling capabilities. We reduced the circuits to 6 to widen the runs, made it a 4 layer board with 3 dedicated to the output runs and used 2 ounce copper to make all runs thicker. In the future we may offer something that handles more current if we can solve the space versus current issue.
BLUE SEA
Specifications
Cover Material Polycarbonate
Base Material Reinforced Polycarbonate
Weight Lb (Kg) 0.55 (0.25)
ATO/ATC Fuses Available 1 to 30 Amperes
Maximum Amperage Per Circuit 30 Amperes
Maximum Amperage per Block 100 Amperes
Maximum Voltage Rating 32 Volts DC