[frodus]

Why not just use a contactor and fuse? The LEV/EV200's can break like 900A.

Paralleling circuit protective devices is not recommended. They do not neccessarily share current equally, and when one trips, the other has the full 500A going through it, which could be beyond its limits.

 

[frodus]

Hi PAK

If one tripped and all 500+ amps were directed to the remaining one it should trip very soon after I would think

The issue is that it might try to trip and weld itself together!

I have had some overloaded contactors stick closed

Exactly! It could trip, but it may not be designed to handle a huge surge that goes from 250A to 500A, and could weld.

The other thing, is you need to link the circuit breakers so they trip at the same time.

I guess I had that happen once too.

There is still a fuse that is really the first layer of protection. It blew before the breaker tripped when my logisystem controller just died.

I just found these manual disconnects referred to in the sticky above. http://www.gigavac.com/catalog/power-products/manual-disconnect-switches

These look like a good option, I just don't know how much force is needed to turn them. The current choke cable I have easily throws the circuit breaker, not sure if it would work on this switch since it requires more of a twist than a pull. Anyone use one of these who can tell me about how much force is required?

I think you're going down the right path, with that manual disconnect. You're protected (fuses and contactors), you just want ease of disconnect. You could use a huge Anderson plug rated for full pack voltage,