Hello Dave,
I like heavy super duty industrial open type contactors that can be adjusted
for drop out and pull in of the contact pads. Can be completely overhaul
and still get parts for it no matter how old it is. The type of contactor
is from CableForm Inc which is a 600 amp continuous running and have a peak
current rating of 2000 amps. You can stack up more conductor straps in
increase the ampere. The contact buttons are mounted on a 2 inch long by
1.5 inch high by 1 inch wide block of brass where you can mounted several
large 4/0 or larger wired terminals. This contactor is mounted on a
insulated chassis board.
You can get line voltage coils, meaning that the coil can be operated at the
voltage of the battery pack. You can adjust the coil voltage size, where
when you battery pack is at the lowest limit your controller is set, and for
some reason the controller does not drop out, the controller will then drop
out if you use the correct coil voltage. If you do not want this feature,
than use a separate 12 voltage source.
I am using a 180 volt contactor coil, which is control by a Square D glass
relay by the Zilla. It is best to use this type of relay to control a
contactor with a 12 volt coil, because the inductive kick can take out a
controller driver circuits which has done to some people on this list. I
use a NTE4933 Zener Overvoltage Transient Suppressor Bidirection across the
contactor coils which suppresses the inductive surge.
The frame size is a standard industrial size, meaning 50 years from now a
new contactor will fit in the same location you install back in 1950. Same
as a circuit breaker for a house that was install back then, you can get a
circuit breaker that will still fit the same panel frame.
As for the fuses, I have use Bussman Limitron bolt fuses that mount on
insulated stand offs. For 30 years I ran this 400 amp continuous rated fuse
with a peak AIC 250,000 amps. I can pull 600 amps for 3 or more minutes
going up a 2 mile 7 percent grade hill at 60 mph pulling a 8000 lb EV using
300 AH cobalt batteries.
If you go to the Bussman fuse WEB site, It will give you the range of
interrupting ampere per time. I think it was still several seconds at 7000
amps.
Look at your controller specifications for the recommended fuse size. My
1000 amp Zilla recommended a semi-conductor fuse, which is design to protect
solid state devices. I use a 400 amp semi-conductor fuse, but they do not
have the high AIC rating as of the Limitron type fuse. These fuses will blow
if you have a short circuit, but also does have a long over current delay
time.
If you do not worry about cost, these industrial protection devices can cost
as or more than a controller and they are larger than the throw away enclose
contactors.
Roland
----- Original Message -----
From: <
[email protected]>
To: <
[email protected]>
Sent: Friday, September 21, 2007 9:27 PM
Subject: [EVDL] Contactors, Fuses and Circuit Breakers
> I am planning on having peak currents of 1000 Amps. Where can I get
> Contactors, Fuses and Circuit Breakers that can handle that?
>
> Thank you,
>
> Dave Delman
> 1981 Electric DeLorean Project
> electricdelorean.com
>
>
>
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