Just remembered, it came from an APS battery backup power supply for a computer. It was fed from a pair of 6v sealed batteries.

OK, 6V (I think the batteries were in parallel) up to 120v. Looks like I'm out of luck here.

When energized by AC power, the inductive reactance serves to limit the primary current exactly as higher resistance would do.

If this was used for a UPS, then most likely the black & white wires are the Secondary.

The two 3-wire pairs are the Primaries - the same gauge primary/secondary was probably the AC line input (with surge suppression, RFI filtering and relay switching) in normal operation.

The heavier gauge wires were probably from the inverter output and used the transformer to produce the stepped up voltage when in UPS mode.

Thanks. Guess I'll have to pop ~$10 for a 24v eBone special.