The present disclosure relates to a power device for continuously detecting entry and exit positions. The power device comprises: a cradle having a cradle terminal formed therein; a breaker main body mechanically and electrically connected to or separated from the cradle terminal; and a girder and a truck which are transfer devices for moving the breaker main body to a connection or separation position, wherein the power device comprises: a position detection area portion formed on a side surface of the breaker main body; and a sensor module provided with a non-contact sensor which faces the position detection area portion and detects the position of the breaker main body by sensing a moving position of the position sensing area. portion, the sensor module being fixedly coupled to the inner surface of the cradle.

Motor control centers have units or buckets with an extendable/retractable power connection (stab) assembly and one or more operating lever interlocks that include a unit latch to latch to a cabinet and a power connection position interlock that blocks the handle of the units or buckets based on position of the power connection assembly, optionally also including a shutter cam that slides a shutter right and left.

A spring loaded, bistable connect/disconnect mechanism for a motor control center (MCC) unit 20, provides a secure and quick means to connect and disconnect the stab 30 of a MCC unit to a vertical power bus 24. The low profile mechanism comprises a series of flat links 6, 7, and 11 and an over-center spring 8 in the top of the MCC unit, for efficient use of space. The mechanism provides an additional force to quickly connect and disconnect the stabs to and from the power bus. The mechanism enables safe insertion and removal of the MCC unit from an MCC section, by incorporating interlocks 5 to prevent the MCC unit from being inserted when the stabs are extended and to prevent the MCC unit from being removed when the stabs are extended. Interlocks prevent the extension or retraction of the stabs when the handle is in an ON position.

A spring loaded, bistable connect/disconnect mechanism for a motor control center (MCC) unit 20, provides a secure and quick means to connect and disconnect the stab 30 of a MCC unit to a vertical power bus 24. The low profile mechanism comprises a series of flat links 6, 7, and 11 and an over-center spring 8 in the top of the MCC unit, for efficient use of space. The mechanism provides an additional force to quickly connect and disconnect the stabs to and from the power bus. The mechanism enables safe insertion and removal of the MCC unit from an MCC section, by incorporating interlocks 5 to prevent the MCC unit from being inserted when the stabs are extended and to prevent the MCC unit from being removed when the stabs are extended. Interlocks prevent the extension or retraction of the stabs when the handle is in an ON position.

A circuit breaker is provided, which includes a cradle having a plurality of cradle terminals, and a breaker main body connected to the cradle and having a plurality of breaker terminals electrically connected to the plurality of cradle terminals, in which each of the plurality of breaker terminals includes a terminal body extended from the breaker main body and protruded toward each of the plurality of cradle terminals, contacts coupled to upper and lower portions of terminal body and disposed in parallel to face each other, and a contact protrusion protruded to a round shape in a direction which the contacts face each other such that, upon connection of the plurality of cradle terminals, the contact protrusion contacts and presses both sides of the connected cradle terminals.

Embodiments of the present disclosure relate to a switch device, comprising: a first three-position switch; a second three-position switch disposed below the first three-position switch; a circuit breaker disposed between the first three-position switch and the second three-position switch. A first interlock unit is disposed above the circuit breaker and connected to the circuit breaker and the first three-position switch, and configured to block a manual operation of the first three-position switch in a closed state of the circuit breaker, and configured to block a manual closing operation of the circuit breaker while the first three-position switch is manually operated in an open state of the circuit breaker. A second interlock unit is disposed below the circuit breaker and connected to the circuit breaker and the second three-position switch, and is configured to block a manual operation of the second three-position switch in the closed state of the circuit breaker, and configured to block a manual closing operation of the circuit breaker while the second three-position switch is manually operated in the open state of the circuit breaker.

Embodiments of the present disclosure relate to a switch device, comprising: a first three-position switch; a second three-position switch disposed below the first three-position switch; a circuit breaker disposed between the first three-position switch and the second three-position switch. A first interlock unit is disposed above the circuit breaker and connected to the circuit breaker and the first three-position switch, and configured to block a manual operation of the first three-position switch in a closed state of the circuit breaker, and configured to block a manual closing operation of the circuit breaker while the first three-position switch is manually operated in an open state of the circuit breaker. A second interlock unit is disposed below the circuit breaker and connected to the circuit breaker and the second three-position switch, and is configured to block a manual operation of the second three-position switch in the closed state of the circuit breaker, and configured to block a manual closing operation of the circuit breaker while the second three-position switch is manually operated in the open state of the circuit breaker.

As described above, a withdrawable interlock device of a vacuum circuit breaker according to the present disclosure may locate the second lever between the link and the moving plate, and thus the second lever may be engaged with an outer side of the first lever in a state that the control power connector is coupled to the control power plug not to move the moving plate through the second lever so as to maintain a state that the fitting protrusion is fitted into the fitting groove, thereby having an effect of preventing the circuit breaker body from being separated to the outside of the cradle in a state that the control power connector is coupled to the control power plug to supply power.

As described above, a withdrawable interlock device of a vacuum circuit breaker according to the present disclosure may locate the second lever between the link and the moving plate, and thus the second lever may be engaged with an outer side of the first lever in a state that the control power connector is coupled to the control power plug not to move the moving plate through the second lever so as to maintain a state that the fitting protrusion is fitted into the fitting groove, thereby having an effect of preventing the circuit breaker body from being separated to the outside of the cradle in a state that the control power connector is coupled to the control power plug to supply power.

Disclosed herein is a vacuum circuit breaker. In some embodiments, a vacuum circuit breaker includes a cradle having a rail which forms a travel route; a main body being movably mounted to the cradle and configured to be in a test position or in an operation position; a wheel traveling along the travel route and configured to move the main body to the test position or the operation position; an interlock plate provided in the main body so as to move together with the main body; and a ground interlock device restraining the movement of the main body by restraining the movement of the interlock plate when grounded.