Tap switch

1. prefix identification: WST=Linear type strip tap changer; If it is WSP, it represents a disc switch.

2 Current/voltage: 30=rated passing current 30A; 20=rated voltage 20KV.

3. Structural parameters: 6=number of terminal posts (6); 5=spacing between terminals (5 pieces).

4. Correlation logic: voltage high and low → determines the length of copper tube; The current size determines the thickness of the copper tube; Tank height → Match switch to adapt height.