To be clear the fuses themselves by E.T.A are great and worth hanging onto, BUT the fuse holders that are mounted onto the 12V DIN Rail are NOT designed for life at sea and will break early and repeatedly.

Keep a stock of good marine grade blade fuse blocks that you can use to jump over the damaged blocks, using the same resettable fuse in them, because the originals are not fit for purpose and also very hard to get in most countries.