From 1 KV to 40 KV dry-insulated. 1 KV to 500/A/3 KV Oil-insulated, Transformer ratio from 1 KV to 500/A/3 KV to 100 V up to 220/3 V with accuracy as max. ±0.005%, ±0.5 Min at 0.4 to 1.2 rated voltage.