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Selecting the Appropriate Fuse Rating When Installing the 120A SI ACR


August, 17 2007
When installing Blue Sea Systems 120A SI ACR, PN 7610, use this chart to select the appropriate wire size and fuse rating.

Wire Size and Fuse Rating Chart (AWG)

Charging Amps

Minimum Wire Size*

Fuse Amps

60
#6
75-90 Amps
80
#4
100-125 Amps
100
#2
150 Amps
120
#1
175 Amps


Wire Size and Fuse Rating Chart (Metric)

Charging Amps

Minimum Wire Size*

Fuse Amps

50
10 mm
75-80 Amps
70
16 mm
80-90 Amps
90
25 mm
125-130 Amps
110
35 mm
150 Amps
120
50 mm
150-175 Amps

Fuses installed between ACR terminals A and B and each battery positive are to prevent a hazard if there is damage to the wires from the batteries to the ACR. Therefore, the fuses should be placed as close as possible to the batteries so that most of the wire is protected.

Since these fuses connect directly to batteries, choose fuse types that have sufficient AIC for your battery bank. Appropriate fuses for this application include ANL, MRBF(Terminal) and MIDI/AMI.

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