Re: [EVDL] Looking for 400V curcuit breaker, get into training!
----- Original Message -----
From: "electroauto.ru" <email@example.com>
Sent: Thursday, January 14, 2010 4:42 PM
Subject: [EVDL] Looking for 400V curcuit breaker
I'm looking for 400V/250A and 400V/500A DC circuit breaker for my EV
Looks like this part is not common in EV conversions...
What can you recommend?
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
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
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.
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