A racked in and out circuit breaker for a cubical housing of electrical switchgear has a back to front, threaded rod mechanism and, at the rear of the cubical a stationary and interior threaded bolt is provided so that when the rod is turned the circuit breaker is mechanically pulled into the cubical and, if turned oppositely, causes the circuit breaker to move out of the cubical housing. A non-threaded section of the rod cooperates with the same bolt so that when it is within the threads of the bolt, further effort at rotating the rod prevents further rearward movement of the circuit breaker.

A switchgear system may include a switchgear frame, a truck and circuit breaker mounted thereon. A drive mechanism is mounted on the switchgear frame and configured to rack the circuit breaker into a) a first connected position where the primary and secondary circuits are electrically connected, b) a second test position where the primary circuit is electrically disconnected and secondary circuit connected, and c) a third disconnected position where the primary and secondary circuits are electrically disconnected, wherein said drive mechanism comprises a drive chain and shuttle configured to engage the truck and rack and fix the circuit breaker into the first connected position.

A switchgear system may include a switchgear frame, a truck and circuit breaker mounted thereon. A drive mechanism is mounted on the switchgear frame and configured to rack the circuit breaker into a) a first connected position where the primary and secondary circuits are electrically connected, b) a second test position where the primary circuit is electrically disconnected and secondary circuit connected, and c) a third disconnected position where the primary and secondary circuits are electrically disconnected, wherein said drive mechanism comprises a drive chain and shuttle configured to engage the truck and rack and fix the circuit breaker into the first connected position.

A contact arm assembly includes a contact arm defining a central axis and having a first end configured for electrical connection with a pole of a circuit breaker and a second end having a distal end defining a shoulder and an engagement that protrudes from the contact arm proximal to the shoulder. A plurality of contact fingers are mounted circumferentially on the second end of the contact arm and configured to electrically engage a primary circuit contact. Each contact finger has a body with a depression that receives the engagement for electrical contact.

A medium-voltage switchgear system includes a three-phase circuit breaker having first, second and third single-phase vacuum interrupters connected between respective first, second and third single-phase inputs and first, second and third single-phase outputs. Magnetic actuators are connected to first, second and third single-phase vacuum interrupters, which are configured to receive an interrupt signal and in response, actuate the respective vacuum interrupter connected thereto into an open circuit condition. A controller circuit is connected to each of the first, second and third magnetic actuators and generates an interrupt signal in response to a detected single-phase overcurrent or fault on a single-phase circuit and interrupt that single-phase circuit on which the single-phase overcurrent or fault occurred and maintain power on the remaining two single-phase circuits over which a single-phase overcurrent or fault was not detected.

A switchgear system includes a switchgear frame having an interior compartment and front opening and containing therein at least one electrical switchgear component. A truck carries an electrical component and is supported for movement on the switchgear frame. A drive mechanism connects the truck and is configured to rack in the truck into an electrically connected position with the at least one electrical switchgear component, rack out the truck from the electrically connected position into an electrically disconnected position, and rotate the truck upward from its disconnected position into a rotated position to allow operator access through the front opening to the at least one electrical component.

A switchgear system may include a switchgear frame and a truck carrying a circuit breaker and supported for linear movement on the switchgear frame. A drive mechanism may rack in the truck and the circuit breaker is in electrical connection with primary circuit contacts, and may rack out the truck and the circuit breaker is electrically disconnected from the primary circuit contacts. As the drive mechanism racks in the circuit breaker, a shutter linkage moves a shutter opened, and as the drive mechanism racks out the circuit breaker, the shutter linkage moves the shutter closed over the primary circuit contacts.

An external racking device for remotely racking in and racking out an electrical circuit breaker from a cabinet. The racking device includes a motor head equipped with an electric motor, the electric motor being provided with a rotating shaft ended with an adaptor, and arranged to be coupled with a racking mechanism of an electrical circuit breaker, so that when driven in rotation, the shaft, depending of rotation, trigger either the racking in or the racking out of the circuit breaker from the cabinet. The external racking device further includes monitoring means intended to enable or to disable the operation of the electric motor depending on the status of a circuit breaker to be racked in or racked out from a cabinet.

An external racking device for remotely racking in and racking out an electrical circuit breaker from a cabinet. The racking device includes a motor head equipped with an electric motor, the electric motor being provided with a rotating shaft ended with an adaptor, and arranged to be coupled with a racking mechanism of an electrical circuit breaker, so that when driven in rotation, the shaft, depending of rotation, trigger either the racking in or the racking out of the circuit breaker from the cabinet. The external racking device further includes monitoring means intended to enable or to disable the operation of the electric motor depending on the status of a circuit breaker to be racked in or racked out from a cabinet.

A prefabricated support comprises a one-piece body defining a reception housing intended to receive an electrical switching apparatus and also delimiting a passage in which electrical conductors are housed, the body comprising a separating wall, the wall and at least one side of the plate forming a lateral face of the support, the lateral face comprising at least one first fixing member and at least one second fixing member, each second fixing member being of a form complementary to the first fixing member, each first member and each second member being adapted to be engaged with, respectively, another second member and another first member.