Neutral position is functioned to cut off both power sources. In case UPS is applied, It is available to transfer to neutral position by tripping mechanism after checking circuit stability and safety instead of instantaneous transfer as follows. A→ Off→ B, B→ Off→ A and A→ Off→ A, B→ Off→ B Instantaneous transfer can be available also by operating signal.
Sufficient contact capacity against accidental current. (20 times of operating current)
On-load break and make type.
Easy busbar arrangement.
Prevent the simultaneous closing by complete mechanical and electrical tripping mechanism.
Current carrying capacity of N-phase is 100% same as other phases.