Mick,
There are both QOU2DTILA and QO2DTILA. Surprisingly, they're
different items and aren't interchangeable.
Allan
On 1/14/2011 10:37 AM, Mick Abraham wrote:
Hello, Jeremy or Amy~
The T240 auto-transformer did not ever come factory-installed on a
Trace Power Panel. The T240 was always just a part, but some
technicians have field installed those onto the blank space on a
"single inverter" Power Panel. T240 does incorporate some Square-D
breakers and I believe there were some blank spaces which could be
used as desired.
The Square-D Mechanical Interlock allows a "toggle" between two
(QO or QOU) adjacent breakers, so that only one breaker can be
"on" at a time. (This accessory requires that the breaker on the
right side is double pole. The LH breaker can be double pole or
single pole.) The part number for the Mechanical Interlock part is
QOU2DTILA.
The Mechanical Interlock was used in the gray box(es) at top of
the Trace Power Panel and in that case the Interlock is working
with QO style breakers plugged into a mini-sized QO breaker box.
The gray cover on those mini breaker boxes was always a funky fit
over the breakers inside...something just didn't seem to line up
properly.
The same Mechanical Interlock can also work with QOU (Unit mount)
breakers from Square-D and those are the ones which were used
inside the T-240 transformer. The QOU's do not plug into a
conventional breaker bus but instead they have mounting tabs so
they can be bolted down, and they accept a wire on both ends of
the breaker.
Proper ampacity rating for AC breakers depends on the transfer
switch rating for the inverter in question. For DR series
inverters those breakers were rated for 30 amps. For SW series
inverters the AC breakers were rated for 60 amps.
Breaker model numbers for Square-D begin with the series...QO or
QOU in this case...followed by one digit to indicate the number of
poles...followed by two digits to indicate the ampacity rating.
Example: a double pole "unit mount" style breaker with 30 amp
rating would be number QOU230
Jolliness,
Mick Abraham, Proprietor
www.abrahamsolar.com
Voice: 970-731-4675
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