48v shunt trip breakers?

A

aatheus

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Sep 13, 2017
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Looking for any recommendations on a good high-power breaker that the Batrium BMS can control, for use as a 'critical disconnect' (disconnect the battery in emergency). It needs to switch 48V at >= 200A (main pack disconnect), with 48V for its control voltage. Any help is appreciated!
 
I guess you checked out my video?


There are also a couple of links in the description of the video.
 
Thank you daromer, wim. I will check out both the video and that thread.

I found a breaker that may work for my system. I intend the maximum current from my battery to be 200A @ 48v. So this breaker is right at the limit of what my system would be expected to provide.

http://www.ebay.com/itm/ABB-SACE-S3...523200?hash=item1eceeaf3c0:g:EHcAAOSwRwhZsDkn

One concern that I have... the breaker lists 24V as its control voltage, but my system is 48VDC. I assume that the 24V breaker is not safe to drive at 48V?
 
To provide the 24vdc to the shunt trip i have made a middle connection in the 48v battery string, it only uses a little bit of power when tripping ( few msec ) so not a problem with balancing or so.
I have tested the shunt up to 60v but it is not advised.
 
You can just hook up a powerresistor. Me including several others based on Batrium is doing that. No need for middle string since the time its used is just a fraction of a second.

If you calculate the current needed to trip you add a resistor and do simple voltage dividing. it works fine and will save the shunt from overvoltage/current)

I have a video pending for above on how to hook it up and also make sure it can be controlled without issues :) My first video was about external control ie take external power instead of using the built in.
 
hahaa :) There is only 24hour each day... I need mooooore :D

So many videos on my "todo" list... so little time
 
daromer said:
You can just hook up a powerresistor. Me including several others based on Batrium is doing that. No need for middle string since the time its used is just a fraction of a second.

If you calculate the current needed to trip you add a resistor and do simple voltage dividing. it works fine and will save the shunt from overvoltage/current)

I have a video pending for above on how to hook it up and also make sure it can be controlled without issues :) My first video was about external control ie take external power instead of using the built in.
Click to expand...

I always forget about voltage dividers. Good idea :)
 
I was looking for a 48vdc coil shunt-trip for my cargo trailer conversion - 100a dc (load) is fine as its a 14s (48v) lithium-ion battery and 3000w PIP.

I found a niceSchneider with 48v coil range for only $32 BUT they wanted over $100 shipping - yikes I just can't sanction that (I know - its not logical as I paid just as much)!

I want 48vdc coil so I can just use the battery (thru Watchmon Expansion relay) to do the tripping and not have to have an extra 48vdc -> 24vdc converter like I have for the house system to ABB SACE.

I found this and will try it - https://www.rivercityindustrial.com...ker-w-shunt-3p-cutler-hammer-100-amp-em2353-1

image_exrqmd.jpg


The link is "Sold Out" because I just bought the only remaining one in stock but maybe they'll get more by the time someone else is looking :)

P.S. The shipping was only $12
 
Just tie it through half the battery bank and you get 24v. Dont use DC/DC. They can also fail.

Thats how most of us run it.
 
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