Mechanical and electrically Inter Lock was implemented, thereby being the acceptance price of being absolutely required the stable supply in electric power. It was developed as product that is applied to hospital, communication center, computational room, and main facilities. It is ATB in Compact Type that the existing problem in ATS was supplemented, that is switched at high speed, and is excellent in breaking performance, and that can protect the electric-power series even given the occurrence of several accidental currents such as over current and ground-fault current detection. 1. Design according to the international specification - ATS(domestically available only for PC Type) for CB-Type according to ENC 60947-6-1. 2. As the minimally operation current by Motor Type, it displays the current transmission in high contact point with maximum capacity. 3. It retains neutral position available for OFF in both powers. 4. Addition of By-Pass function by a withdrawal type, and diversity in optional width in economically fixed type 5. Available for utilizing as contact breaker for both powers (non-static By-Pass) 6. Efficiency in space of installing switchboard by small size and light weight (3-phase backlog available) 7. Due to enhancement in ARC arc extinguishing ability in circuit breaker, the damage in the contact point is minimized.