Shutter assembly, locking device, switchboard door, and switchboard including same

A locking device disposed inside a switchboard to lock or unlock a shutter assembly for opening and closing a terminal of an external terminal, the locking device comprising:

• a rotation part that is disposed adjacent to a shutter plate of the shutter assembly and is rotatable;
• a shutter locking plate that is coupled to the rotation part and rotated in response to rotation of the rotation part;
• a connecting rotation plate that is disposed to be spaced apart from the rotation part and rotated by being pressed by a circuit breaker body during a process that a circuit breaker is inserted into the switchboard;
• and
• a connecting rod that is coupled to each of the rotation part and the connecting rotation plate to transmit rotational force generated by the connecting rotation plate to the rotation part,
• wherein the shutter locking plate is disposed in a blocking area, in which the shutter locking plate blocks the shutter plate, before the connecting rotation plate is rotated by the circuit breaker, and
• is rotatable to outside of the blocking area of the shutter plate when the circuit breaker is inserted into the switchboard and the connecting rotation plate is rotated by the circuit breaker.

A switchboard comprising:

• a switchboard case in which a circuit breaker is mounted to be movable to a test position and a connected position;
• a door that is installed on the switchboard case to be open and closed;
• a shutter assembly that is configured to open and close terminals disposed inside the switchboard case as the circuit breaker is moved into the switchboard case;
• and
• a locking device that is disposed in a region where the same locks the shutter assembly when the shutter assembly is rotated, and is rotated to a region where the same does not lock the shutter assembly to allow the shutter assembly to be rotated as the circuit breaker is moved into the switchboard case.