Connecting device for control terminals in withdrawable type circuit breaker

1. A connecting device for control terminals in a withdrawable type circuit breaker, the device comprising:

a cradle-side control terminal module horizontally installed on a cradle to move slidably thereon;

a main body-side control terminal module provided on a breaker main body to be contactable with or separated from the cradle-side control terminal module; and

a blocking unit restricting or allowing a movement of the cradle-side control terminal module to allow or restrict a contact between the cradle-side control terminal module and the main body-side control terminal module, wherein the blocking unit comprises

a latch release plate fixed to a side surface of the breaker main body and provided with a contact surface on one surface thereof, the contact surface having a flat portion and an inclined portion; and

a latch rotatably disposed on a side surface of the cradle and moving along the contact surface,

wherein the latch comprises a restricting portion formed on one end thereof and brought into contact with the cradle-side control terminal module to restrict the movement of the cradle-side control terminal module, and a contact portion formed on another end thereof and moving along an upper surface of the contact surface.

2. The device of claim 1 , wherein the contact portion is formed as a protrusion in a cylindrical shape, and the cradle is provided with a latch operation hole in which the contact portion is inserted for movement.

3. The device of claim 1 , wherein the contact surface comprises a first flat portion with which the contact portion is brought into contact while the breaker main body moves from a disconnect state to a test state, a first inclined portion with which the contact portion is brought into contact in the test state, and a second flat portion with which the contact portion is brought into contact while the breaker main body moves from the test state to a connect state.

4. The device of claim 3 , further comprising a second inclined portion with which the contact portion is brought into contact in the connect state, and a third flat portion formed on a portion symmetrical to the first flat portion based on the second flat portion.

5. The device of claim 3 , wherein the first flat portion and the second flat portion are formed at different height from each other.

6. The device of claim 1 , wherein the latch release plate comprises a body portion installed at a predetermined distance from a side surface of the breaker main body and having the contact surface on one surface thereof, and coupling portions bent from both ends of the body portion and coupled to the side surface of the breaker main body.

7. The device of claim 1 , wherein the latch release plate is configured for use as a transport handle of the breaker main body.

8. The device of claim 1 , further comprising an elastic member having one end fixed to one side of the latch and another end fixed to a part of the cradle.

9. The device of claim 8 , wherein the elastic member is a compression spring or a tension spring.