Motor control centers have units or buckets with multi-purpose shutter cams that slide shutters right and left to controllably block access to a portal of an isolation lead screw that can extend and retract power connectors and that provides one or more safety interlock engagement features that prevent certain actions depending on the operating state of the buckets.

A direct-current (DC) air circuit breaker for opening and closing a circuit according to various embodiments includes a circuit unit having a main circuit, a detecting unit having a detection circuit for detecting a fault current in the main circuit, and a circuit operating device configured to allow connection or isolation between the main circuit and the detection circuit.

A direct-current (DC) air circuit breaker for opening and closing a circuit according to various embodiments includes a circuit unit having a main circuit, a detecting unit having a detection circuit for detecting a fault current in the main circuit, and a circuit operating device configured to allow connection or isolation between the main circuit and the detection circuit.

An actuator system for operating a switch is described herein. The actuator system can include a shaft of a handle assembly. The shaft couples to a handle and a male coupling element and has a number of positions. Further, a coupling body of a switch assembly can be positioned in the number of positions. The coupling body engages the switch and has a female coupling element, which has a slotted portion that receives the male coupling element and an angled terminus that aligns the shaft to a first position as the shaft couples to the coupling body. The slotted portion receives and engages the male coupling element when the shaft is coupled to the coupling body. The slotted portion prevents the male coupling element from disengaging when the coupling body is in a second position, and disengages the male coupling element when the coupling body is in the first position.

An actuator system for operating a switch is described herein. The actuator system can include a shaft of a handle assembly. The shaft couples to a handle and a male coupling element and has a number of positions. Further, a coupling body of a switch assembly can be positioned in the number of positions. The coupling body engages the switch and has a female coupling element, which has a slotted portion that receives the male coupling element and an angled terminus that aligns the shaft to a first position as the shaft couples to the coupling body. The slotted portion receives and engages the male coupling element when the shaft is coupled to the coupling body. The slotted portion prevents the male coupling element from disengaging when the coupling body is in a second position, and disengages the male coupling element when the coupling body is in the first position.

A breaker actuator includes a slide plate, at least one actuator lever, and a drive plate. The slide plate is linearly movable. The actuator lever is rotatable about a pivot. The actuator lever engages the slide plate and rotational movement of the actuator lever is actuatable by linear movement of the slide plate. The drive plate is moveable between an off position and an on position and is actuatable by rotational motion of the at least one actuator lever. A method for actuating a breaker includes moving a slide plate linearly from a first position to a second position, rotating at least one actuator lever about a pivot from a first position to a second position by the linear movement of the slide plate, and moving a drive plate in front of an electrical breaker from an off position to an on position by the rotational motion of the actuator lever.

A breaker actuator includes a slide plate, at least one actuator lever, and a drive plate. The slide plate is linearly movable. The actuator lever is rotatable about a pivot. The actuator lever engages the slide plate and rotational movement of the actuator lever is actuatable by linear movement of the slide plate. The drive plate is moveable between an off position and an on position and is actuatable by rotational motion of the at least one actuator lever. A method for actuating a breaker includes moving a slide plate linearly from a first position to a second position, rotating at least one actuator lever about a pivot from a first position to a second position by the linear movement of the slide plate, and moving a drive plate in front of an electrical breaker from an off position to an on position by the rotational motion of the actuator lever.

A disconnector device is provided for disconnecting an electrical circuit, wherein the electrical circuit is switched by a contactor between an open position and a closed position, the disconnector device using the contactor for disconnecting the electric circuit. The disconnector device locks the contactor in the open position, in which open position contacts of the contactor are in a first position disconnecting the electrical circuit. An arrangement including the disconnector device and a contactor is also provided.

A disconnector device is provided for disconnecting an electrical circuit, wherein the electrical circuit is switched by a contactor between an open position and a closed position, the disconnector device using the contactor for disconnecting the electric circuit. The disconnector device locks the contactor in the open position, in which open position contacts of the contactor are in a first position disconnecting the electrical circuit. An arrangement including the disconnector device and a contactor is also provided.

An operating mechanism for a toggle switch handle includes a bar that is movably mounted along its longitudinal axis, and a roller head mounted at one end of the bar. The roller head includes two axes for rolls. The first roll of the rolls is provided for turning on the toggle switch handle depending on a movement of the bar, and a second roll of the rolls is provided for rolling over a plate and blocking a rotation of the bar around its longitudinal axis.