BIG Switchgear

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Original poster: "Jason Johnson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <hvjjohnson13-at-hotmail-dot-com>

Hello,

I just acquired some very large breakers, and was hoping someone could
give me some info on whether I could use them for capacitor discharge
stuff or not (or any additional info would be great). Here's all the
known specs, more or less as they are on the plate:

Westinghouse
Porcel Line
Switchgear
De-ion Air Circuit Breaker
50 DH-P 75
Rated KV    4.16
MAX Design KV    4.76
BIL KV    60
Cycles    60
Rated MVA    75
MAX Amps    12500
MOM Amps    20000
Style    449D901G10
Closing Range    90-13000
Trip Voltage    70-14000
Amps 1200

I have 2 of these. I got them at an auction yesterday for 10 bucks,
along with a very nice stainless steel electrical box that goes to
something completely different. They were manufactured in december of
1971, and they were checked and tested on 4/5/88, I assume after being
pulled from service. They have probably been sitting in a warehouse for
a decade, but look brand new, except some oxidation on the suface of
some copper pieces. They are about 22" x 28" x 49" and have 1.5"
diameter solid copper terminals with very neat spring loaded connectors.
They probably weigh 300+ pounds each, as a very rough guess, but aern't
bad to move because they have their own steel casters that look as they
were on a very large rack, where they could slide in or out easily to
change breakers. Its fairly obviouse that they are 3 phase delta,
because there are three large terminals, so I have 6 contacts that I can
parrellel or series. Also, it looks like I can close these electrically
because there is what looks like a very large solenoid and plunger at
the bottom aimed at some very large plate that may push the contacts one
way or another?

My main questions are:
How much current could these handle in a pulse application?
Can I CLOSE the contacts electrically? If not would it be possible to do
it pneumatically, etc?
How much voltage could these hold off before closing?
Anybody familiar with these or similar?

If pics are needed I can post those somewhere.

<< Jason R. Johnson >>
G-3 #1129
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