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

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.