UPS Transformer ?!?

[Anonymous user]

I own a APC Smart-UPS 1000 (SUA 1000 AS0426131716)
It has quit working for reasons yet to be determined but today I took a quick look inside.
I have never made a study of a UPS before and I am assuming they are a battery, a inverter and some sophisticated control circuitry. I have never seen a schematic for a UPS nor read a good description on how they work.
Within the UPS is a transformer very similar to the one in the attached picture. The numbers printed on the side are as follows.
430-1212
Chuan Shun Electric Industrial Company Inc.
CSC-H1
E184733(S) Class H (160º C)
Can anyone tell me anything about a UPS Transformer or better yet about this UPS transformer
Could a transformer such as this be used in a power supply?
It appears as though it is a rather heavy duty power transformer but I am a bit stumped as to why there are four primary feeds.
Or are the smaller wires actually the primary windings?
Was this transformer intended to convert 12 volts into 120.
Any help you all might provide will be greatly appreciated.
I was kind of hoping this old UPS transformer might make a good power transformer.
I have been searching for a transformer that would take 120 volt down to somewhere around 14 to 16 volts at about 50 amps.
What are your thoughts?

[BillP · Accepted solution]

Tom,

That UPS transformer is a specialized unit. But, it's still a power transformer.
There are 4 primary leads because there are actually 2 windings on the primary side. The UPS will use these winding in combinations to provide BOOST and TRIM function while on utility power.
The heavier secondary windings provide power to the charging rectifier while on utility and receive power from the inverter while on battery.
While the nominal battery voltage fro the SU1000 is 24 Volts, the actual secondary AC Voltage from the transformer will be somewhat less while on utility.

You can run a few experiments, you may find that this transformer is quite close to what you're looking for.
(use the White & Black leads on the primary, cap the yellow & blue leads)