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Blue Sea Systems

Blue Sea 5026 ST Blade Fuse Block

12-circuit ATC/ATO blade fuse block with integrated negative bus and cover. 100 A max per block, 30 A per circuit, 32 V DC max.

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This part has no feed of its own to size, so its cables are sized from the complete system topology once you draw what it connects to.

Wiring diagram

How the BS 5026 is wired.

The drawing shows where the feed, the return and the fuse land on this part. The starter uses the same reference circuit and sizing assumptions. Read the installation notes for manufacturer requirements before adapting the runs.

Blue Sea 5026 ST Blade Fuse Block wiring diagram, positive and negative connections between the system bus and the unit, plus 12 × positive output, 12 × negative stud.
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Build it out

Build the system it goes in.

Open the canvas with 5026 already placed, then add your batteries, charging, distribution and loads around it.

Every cable you draw there is sized against ABYC E-11, from the same tables as the reference on this page.

Technical reference

Specs, terminals and the parts around them.

The catalog facts for this part, which terminal takes what, and the hardware you'll want around it. Check the nameplate on your own unit before you order.

Catalog specification

This part has no rating of its own to list. What matters is its terminals — see the map beside.

Supporting parts

  1. A lug or terminal to match each post on the part
  2. Strain relief and boots so nothing chafes or shorts
  3. Cable and fuses sized once the whole system is drawn

Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.

Terminal map

Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.

IN +

in-pos

positive · input

100 A

IN −

in-neg

negative · bidi

100 A

1

c1

positive · output

30 A

2

c2

positive · output

30 A

3

c3

positive · output

30 A

4

c4

positive · output

30 A

5

c5

positive · output

30 A

6

c6

positive · output

30 A

7

c7

positive · output

30 A

8

c8

positive · output

30 A

9

c9

positive · output

30 A

10

c10

positive · output

30 A

11

c11

positive · output

30 A

12

c12

positive · output

30 A

1

n1

negative · bidi

30 A

2

n2

negative · bidi

30 A

3

n3

negative · bidi

30 A

4

n4

negative · bidi

30 A

5

n5

negative · bidi

30 A

6

n6

negative · bidi

30 A

7

n7

negative · bidi

30 A

8

n8

negative · bidi

30 A

9

n9

negative · bidi

30 A

10

n10

negative · bidi

30 A

11

n11

negative · bidi

30 A

12

n12

negative · bidi

30 A

Field notes

How it actually goes in.

What we've read and heard about installing this exact part. These are notes, kept apart from the numbers Crimp works out.

Where does the 5026 fit in a house system?

The Blue Sea 5026 has twelve ATO/ATC positive branches and an integrated negative bus. The manufacturer's specifications limit the complete block to 100 A, each circuit to 30 A, and voltage to 32 V DC. These are ceilings, not recommended fuse ratings. Fuses are sold separately.

The 5026 wiring schematic separates the positive feed, fused branch connections and negative returns. Main battery-feed protection remains a separate design decision. Check actual fuse interrupt ratings against the battery and upstream protection; a blade fuse's amp rating alone does not verify this.

Verified against the manufacturer's documentation, checked 2026-09-11. Manufacturer documentation →

Method & provenance

What is known, assumed and computed.

The manufacturer publishes some of these numbers and Crimp works out the rest. It's worth knowing which is which.

From the maker

What the catalog says

Manufacturer, model, ratings and which terminal does what come from the catalog. A newer revision, or the nameplate on the unit in your hand, can say something different — when it does, the nameplate wins.

ABYC E-11

What Crimp worked out

Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. The run length and the current above are what drive the result. Crimp doesn't know how warm your space gets; draw the cable inside an engine-bay zone on the canvas and it sizes for the heat.

Read how the sizing works

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Other parts that do the same job.

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Next step

Draw the BS 5026 into your own system.

It lands on the canvas already placed. Add what it connects to, and every run gets its wire and fuse as you draw.

Use this component in Crimp