Victron Lynx Shunt M10: When to Use the Bus Bar vs a Fuse
- Anthony Flammia
- Mar 24
- 2 min read
If you’re setting up a Victron-based RV solar system, you may have noticed the Victron Lynx Shunt M10 now includes a bus bar option. That has raised a common question:
When should you use the bus bar, and when should you use a fuse?
In this week’s Two-Minute Tech Tip Tuesday, Todd from Big Beard Battery breaks it down and explains how this applies to lithium battery systems.
Watch the full video here:
What the Lynx Shunt M10 Includes
The Lynx Shunt M10 is part of Victron’s Lynx distribution system. With this version, Victron includes a bus bar that fits where some installers might expect a fuse.
That creates confusion, especially for people building lithium systems.
Why Fuse Choice Matters
In any electrical system, proper protection matters. But not every position needs an extra fuse just because one can go there.
The real question is whether the system is already fused correctly elsewhere.
Lithium Batteries and Class T Fuses
For lithium battery systems, Todd explains that Class T fuses are typically the better choice for battery-side protection.
The issue is that a Class T fuse does not fit in the Lynx Shunt M10 position.
That is why Victron also offers the Lynx Class T Power In, which is designed for that type of protection.
When to Use the Bus Bar
If your batteries are already properly fused, the bus bar is often the right choice.
Using the bus bar avoids adding another unnecessary fuse into the circuit. Since fuses add resistance, doubling up without a reason does not always make sense.
When to Use a Fuse
A fuse in that position may still make sense if the circuit is not already protected properly or if you are working with a different battery chemistry like lead-acid.
But for lithium systems, Todd’s advice is clear:Do not use that position as your main lithium battery protection point.
The Main Takeaway
For lithium battery systems, use the bus bar in the Lynx Shunt M10 when the system is already properly fused on both sides.
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