Boat Show Season is Here - and so are Show Discounts!
Shop Boat Show Specials & SAVE NOW!

Marine Fuse Blocks, BusBars & Terminal Blocks

Boating Know How

Blue Sea Systems Tech Tip: Fuse Color Coding Explained

Color coding made easy. Make sure you use the correct fuse. Learn how here ... read more Infographic: Tech Tip: Color Coding Explained for Fuses

Circuit protection color coding helps boaters to match fuses with compatible fuse holders and fuse blocks in order to improve interpretation. On the packaging for fuse holders and fuse blocks, there will be color coded labels in the form of rectangles that will be an indicator designed for each specific holder or block. Some fuse blocks will require multiple fuse types. Some of the more well-known ratings appear in blue or black. The blue consists of APS, ATO, or ATC ratings, and the black consists of AMI and MIDI. These are not the only ratings. However, there are many other classifications. Below is a representation of the required fuse types. The stats on these ratings are as follows:

  • -APS: micro2, micro3, and low-profile mini
  • -APM/ATM: mini
  • -APR/ATC/ATO: regular
  • -APX: maxi (heavy duty)

The sizes on these are as follows:

  • Length: 9.1 mm
  • Width: 3.8 mm
  • Height: 15.3 mm
  • Length: 14.4 mm
  • Width 4.2 mm
  • Height: 18.1 mm
  • Length: 10.9 mm
  • Width: 3.81 mm
  • Height: 8.73 mm
  • Length: 10.9 mm
  • Width: 3.6 mm
  • Height: 16.3 mm
  • Length: 19.1 mm
  • Width: 5.1 mm
  • Height: 18.5 mm
  • Length: 29.2 mm
  • Width: 8.5 mm
  • Height: 34.3 mm

We do recommend advising with a local mechanic or technician to determine what size and rating you need for your application.
read less
About Fuse Blocks

Fuses, Holders, Busbars, and Terminal Blocks for My Boat

At we have your entire marine fuse and fuse components covered, including marine fuse blocks, fuses, fuse holders, busbars and terminal blocks. Choose from a large variety of marine grade products from top brands such as Blue Sea Systems, Ancor, SeaDog, Paneltronics, Sierra and SeaSense. Are you looking for a specific fuse related product that you can't seem to find? Our friendly customer service department is happy to help find the part you're looking for. Expect the best when you use for all your marine fuse, busbar and terminal needs.
Boating Gear at Boat Show Specials!
Grab New Gear. Pocket More Savings.