What fuses do victron Lynx use?

The Victron lynx products are a very popular modular busbar system which uses mega fuses for the branch circuits. Mega fuses only have ~2000 amps breaking capacity at ~60 volts. I think this is ok because of the selective coordination concept described above.

How does a PTC fuse work?

A PTC fuse is a resettable fuse that has an internal mechanism that dramatically increases its resistance when a short circuit occurs. This increase in resistance effectively disconnects the circuit. Once the current flow is below a certain threshold, the PTC fuses automatically switch back into a low resistance state.

What is a circuit breaker resettable fuse?

Circuit Breakers Resettable Fuses Type 3 manual resettable fuse, perfect for protecting in an over-current or short circuit condition. What Does Overcurrent Mean?

Should a breaker be added to a battery pack?

And the distance is so short that the voltage drop differential between the packs would be minimal. He could add a 4th battery as well. The breaker is fine for individual pack protection. If you put more than 3 in parallel, a busbar and t class fuse is recommended. If I understand correctly you are talking about a topology like this. negative

What size fuses do I Need?

You are using 2/0 awg wire which is good but your minimum fuse size should be 200 amps. Your max size (which is my recommendation) is 300 amps. Fuses protect wires not inverters. Pure copper wire with insulation rated for 90C or better can be fused as high as 300 amps. Higher rated fuses typically have lower resistance.

How do you prevent a fire if a fuse is stranded?

Something as simple as using the right fuse can reduce the chances of a fire to nearly zero. Make sure to avoid solid wire. This may seem counter-intuitive, but stranded wire is usually the best option. Solid wire is stiff and hard to bend compared to stranded wire. It’s also a lot harder to solder.