Toroidal power transformer 1Audio amplifier toroidal transformer 2Lighting lamp transformer 3power transformer 4Electrical Toroidal Transformer Features: Power range:10VA-10KVAApproval:DIN EN61558 or UL1012Input/Output:CustomizedInsulation Class:UL B,F,H,N(Optional)Isolation:4KV(Hi-pot)Frequency:47-63Hz Advantage:2 Small size,low weight3 Low magnetic strayfield