This kind of switch applies to the single-phase combination oil-immersed transformer electrical power with rated voltage of 10KV-24KV, rated current of 30A-63A; the voltage-regulating mode are: central part, terminal point ncutral point, which canbe dircctly fixed on the tank cover of the transformer, exchange under the off-circuit condition. Type WDTII Single phase-tap changer (delta connection) - Used in mineral oil or silicon oil - Rated voltage 10KV-24KV - Rated current from 30A- 63A - Tapping position:3-7 - Regulation 2.5% per position