600 VDC switches [RE-wrenches]

[Bill Brooks]

Travis,

I spoke with a Cutler Hammer engineer some time back and he said that they
ship the 600Vdc switches with the jumper already installed. I believe they
normally switch the middle and left poles rather than the two outer poles as
with the Square D switch. I'm sure it will handle 600 Vdc if you install the
jumper yourself, but it needs to say somewhere on the box or in the
cutsheets that it can handle 600 Vdc.

With this new news from Square D, there is no question as to what switch to
use for a multiple inverter situation.

Bill.

-----Original Message-----
From: Travis Creswell, Ozark Solar [mailto:ozsolar at ipa.net]
Sent: Tuesday, February 11, 2003 8:13 AM
To: RE-wrenches at topica.com; RE-wrenches at topica.com
Subject: Re: 600 VDC switches [RE-wrenches]


What can anyone tell me about the Cutler Hammer DH361URK for use with Sunny
Boy's?  It's a non-fused 3 pole 600 volt 30 amp Nema 3R safety switch.  My
local supplier sold it to me as a 600 VDC rated switch but the inside cover
says 250 volts.  I've asked him to contact CH about the DC rating if you
were to wire the three poles in series but have yet to hear back from them.
My application will have a Vmp of less than 300 volts and a Ocv of less than
400.  Is it safe to assume that wiring the 3 poles in series will increase
the DC rating of any non fusible switch that starts out with a DC rating of
250?


Thanks
Travis Creswell
Ozark Energy Services

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