This is a medical appliance toroidal power transformer, It is UL approved and used on many different kind of medical machine.

Power transformer Features:
1) Universal purpose
2) Reliable safety approvals
3) Twin primaries / twin secondaries
4) Low profile and low weight
5) Low no-load losses
6) Low stray magnetic field
7) Low operating temperature
8) High efficiency
9) Cost saving prices
10) Easy to mount