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Blue Sea Systems

Blue Sea 5026 ST Blade Fuse Block wiring diagram

See the Blue Sea 5026 ST Blade Fuse Block connection points and wiring example. Open the diagram in Crimp to add your equipment and plan the cables between them.

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Open this example as a new project. Use your own parts and cable lengths to make the plan yours.

About this wiring example

Use the diagram as a starting point for your installation. Replace the example equipment and cable lengths with your own, and check the connections against your exact model's instructions.

Cable sizes depend on the connected equipment, current and cable lengths. Add those details in Crimp to size each run.

Show sizes in AWG

Wiring diagram

How the BS 5026 is wired.

Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.

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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Installation notes

Connections and installation requirements.

Guidance for this model, with sources linked beside the relevant advice.

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

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.

Build it out

Connect it to the rest of your system.

Add 5026 to your diagram, then connect your batteries, chargers and loads. Crimp calculates cable sizes and checks the connections as you draw.

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

Technical reference

Specifications, terminals and supporting parts.

Check the model, ratings and connection points against your own unit before choosing installation hardware.

Catalog specification

Connection limits are listed in the terminal map. Use the manufacturer's documentation for the full specifications.

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

Method & provenance

Where the specifications and sizing come from.

Manufacturer specifications describe the equipment. Crimp calculates cable results from the circuit and assumptions you enter.

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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Next step

Plan your installation with BS 5026.

Open this example as a new project. Add your equipment and cable lengths, then review the sizing and checks for your setup.

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