[EVDL List]

Hi Oleg;

Not VERY common in conversions, for sure! Yur up in Electric Railway
hardware stuff! Got any Trolley cars in your town? Maybe somebody at their
workshop could help you?Maybe your trolley and trackless trolley bus lines
might be able to help you? just drive your EV to the car barn and do show
and Tell. The Russian RR's are alot electric, but I think they are high
voltage, but the locomotives MAY have lo-voltage DC circuits aboard? I used
to be the FIRST guy at the scrapping lot with my tools when a locomotive was
being put to death; Contactors, cables, etc, after all WHO the hell ELSE
would be wanting stuff like that??Working for the Railway was a BIG help,
here!

Happy Hunting!

Bob
----- Original Message -----
From: "electroauto.ru" <xxx@xxx.xxx>
To: <xxx@xxx.xxx.edu>
Sent: Thursday, January 14, 2010 4:42 PM
Subject: [EVDL] Looking for 400V curcuit breaker


>
> Hello,
>
> I'm looking for 400V/250A and 400V/500A DC curcuit breaker for my EV
> project.
> Looks like this part is not common in EV conversions...
>
> What can you recommend?
>
> Regards,
> Oleg
>
> -----
> Drive electric in Russia!
> http://www.electroauto.ru http://www.electroauto.ru
> http://ecomotors.ru/ http://ecomotors.ru/
>
> My EVs:
> http://www.evalbum.com/1474 http://www.evalbum.com/1474
> http://www.evalbum.com/2891 http://www.evalbum.com/2891
> --
> View this message in context:
> http://n4.nabble.com/Looking-for-400V-curcuit-breaker-tp1014283p1014283.html
> Sent from the Electric Vehicle Discussion List mailing list archive at
> Nabble.com.
>
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[EVDL List]

----- Original Message -----
From: "electroauto.ru" <xxx@xxx.xxx>
To: <xxx@xxx.xxx.edu>
Sent: Thursday, January 14, 2010 4:42 PM
Subject: [EVDL] Looking for 400V curcuit breaker



Hello,

I'm looking for 400V/250A and 400V/500A DC circuit breaker for my EV
project.
Looks like this part is not common in EV conversions...

What can you recommend?

Regards,
Oleg

Hello Oleg,

A industrial breaker that size will be either a L or a M frame circuit
breaker. The frame size is the size of the molded breaker case. It
normally has a removable front cover, so we can replace the over load trips,
contacts, etc just like it is done for contactors.


In a L frame, the LA is rated for 250 VDC and the LH for 500 VDC at 600 amp.
In a M frame, the MA is rated for 250 VDC and the MH for 500 VDC at 1000
amp.

These breakers new, list at wholesale over $5000.00!

Many times if these breakers trip under load, we have to overhaul them. The
magnetic trips today and contact kits can cost as much as a new circuit
breaker, so the breaker is discarded and a new one is install.

These L and M frame cases can be purchase as a molded case switch, meaning
there is no automatic trips, just solid bars in place of the overload units
if all you need is a switch.

Using it as a switch, you could find a old L or M frame case from a
electrical shop or that may have replace one at one time or from a savage
company from on line.

Using a L or M frame case, you could actually bolt in a semi conductor bolt
in fuse in place of the solid bars. There is also a low voltage activator
that can be added to the handle, so you can remotely turn on or off this
unit.

It is still not recommended to turn off this breaker normally under full
load. But all you have to do if this is done under a energy shut down, is
to recondition the contact pads or use 1000 F. silver solder to weld on new
contact pads that you can get from a local electrical supply house.

Roland

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