Fuse Blocks - Blue Sea Systems Fuse Blocks . Fuse blocks loaded with fuses protect the wire in electrical circuits. Blue Sea Systems broad selection of fuse blocks include single and consolidated fuse blocks. Their robust design makes them ideal for marine and vehicle AC & DC electrical systems. Amazon : Blue Sea Systems ST Blade Fuse Block - 12 I have always used Blue Sea Systems fuse blocks due to their rugged design, ability to withstand moisture, and there ease of use. The fuse block is rated up to 100 amps and I will always place a reset-able fuse between the battery and the fuse block.4.7/5(1)Price: 39 Fuses and Fuse Blocks - Blue Sea Systems Blue Sea Systems extensive selection of circuit breakers, fuses, fuse holders, and fuse blocks fives boaters a range of choices for main and branch circuit protection. To help select the right size wire and proper fuse or circuit breaker, Blue Sea Systems offers our Circuit Wizard.