[RE-wrenches] low voltage disconnect relay

[Kurt Albershardt]

On 3/4/09 2:16 PM, Jeff Blick wrote:
>
> I am wondering if any of you are familiar with a relay that will 
> operate as a low voltage disconnect/reconnect.  We are using stacks of 
> three xantrex xw inverter/chargers for each back up battery bank.  Do 
> any wrenches know of a relay that would work for this configuration 
> (48 volt battery bank)?
>

These are quite common in telecom, often as part of an assembly referred 
to in the trade as a BDFB (Battery Distribution Fuse Bay) or BDCBB 
(Battery Distribution Circuit Breaker Bay.)  Telco standards and 
practices represent the distillation of a hundred years' realworld 
experience with DC power – I tend to trust them when it comes to 48V 
distribution equipment.

Off the shelf LVD modules come in sizes up to 600A or so from most major 
telecom power manufacturers.  Systems rated for 4,000A or more are not 
uncommon.

There is a lot of *beautifully* engineered DC power distribution gear 
out there in the secondary market - a surprising amount of it unused.  
Some of it shows up on eBay, but there is a lot more hiding in 
warehouses collecting dust.  Contact me off-list and I can put you in 
touch with a couple of telecom hardware resellers who may be able to help.





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