Overview

The Blue Sea Systems 9159 is an m-Series battery switch link bus used to parallel compatible m-Series battery switches in a high-current DC system. It is built from tin-plated copper, carries a 250A continuous DC rating, and comes as a 2-pack for multi-switch battery bank layouts.

This part is used when two m-Series battery switches need a direct switch-to-switch connection without making up short jumper cables. On a boat, that usually means a cleaner battery switching layout, fewer extra cable terminations around the switch cluster, and a setup that is easier to trace later during service or troubleshooting.

Key features

• Made to parallel compatible Blue Sea Systems m-Series battery switches
• Tin-plated copper construction for strong conductivity and better corrosion resistance in marine electrical spaces
• 250A continuous DC rating for battery switching circuits that carry substantial current
• Sold as a 2-pack for dual-switch installations or keeping a second link bus for matching switch layouts

Compatibility and fit

This link bus is for Blue Sea Systems m-Series battery switch installations, so the main fit check is the switch family rather than the boat model. It suits boats with separate battery banks where the switching arrangement calls for the switches to be paralleled at the panel or battery management area.

It is a sensible match for compact DC systems on center consoles, cruising boats, fishing boats, and sailboats where switch access is tight and clean cable routing matters. It is not a battery switch by itself and it does not replace overcurrent protection or a main distribution bus elsewhere in the system.

Installation and setup

This part belongs at the battery switch cluster and should be installed where the switches are mounted securely and protected from unnecessary movement. In a refit or new build, it helps simplify the switch-to-switch connection so the layout around the battery switches stays easier to inspect and maintain.

Because it sits in the high-current side of the DC system, the rest of the installation still needs to be built around the current demands of the boat and the rating of the connected switches and cabling. The link bus helps with the physical interconnection, but the overall system design still depends on the rest of the battery switching hardware being matched correctly.

What’s included

• Two m-Series battery switch link buses