A system and method for connecting supply power to motor control components includes use of a motor control center subunit with moveable supply power contacts. After a motor control center subunit is secured into a motor control center compartment, the supply power contacts may be advanced to engage supply power buses. For disconnection, the supply power contacts may be retracted and isolated from the buses before physical removal of the subunit.

An electronic device is provided that includes an electronic component within the electronic device, a kill switch; an access door providing access to the electronic component and the kill switch and a latch for securing access to the electronic component in a closed position and for giving access to the electronic component in an open position. The latch activates the kill switch in the open position, independently of a position of the access door.

A circuit breaker includes a circuit breaker main body unit having a main circuit unit forming a circuit line of each phase, a current transformer part having a coil disposed in the circuit line of each phase and a pair of terminals extending from both ends of the coil and selectively connected to an external power source unit, and a safety switching part configured to connect the pair of terminals such that the pair of terminals are not opened, when the power source unit and the pair of terminals are separated.

An in-wall electrical control unit with openable switch cover has a switch cover attached to a housing of the electrical control unit adjacent to a user interface of the electrical control unit such that the switch cover can be maneuvered between an opened position exposing the user interface for programming and a closed position wherein the switch cover is positioned over the user interface. An interface actuation knob on an inner surface of the switch cover aligned with a specific control of the user interface allows the user to operate the specific control while the switch cover is in the closed position.

A latch switch assembly for an appliance or the like provides spring-loaded jaws to retain a latch strike when a door of the appliance is closed and a switch operator positioned behind spring-loaded jaws be activated by the latch strike when it is received.

A device for supplying electric power includes a rectifier, an adaptive voltage clamping circuit, and a DC-DC voltage regulator. The rectifier receives electrical power, and is electrically connected to an input line of the adaptive voltage clamping circuit. The adaptive voltage clamping circuit includes a power transistor, a voltage feedback circuit, and a controller. The DC-DC voltage regulator is electrically connected to the adaptive voltage clamping circuit and, in one embodiment an actuator. The controller monitors the voltage feedback circuit and controls the power transistor to a fully open state to transfer electric power to the DC-DC voltage regulator when the voltage level supplied to the DC-DC voltage regulator is less than a threshold. The controller controls the power transistor in a linear state to regulate the voltage transferred to the DC-DC voltage regulator when the voltage level supplied to the DC-DC voltage regulator is greater than the threshold.

A safety switch includes a housing including first and second compartments that are separated by a barrier, a switch mechanism in the first compartment, one or more fuse holders in the second compartment, a first door connected to the housing and covering the first compartment, a second door connected to the housing, a handle connected to the switch mechanism, and a locking mechanism operatively connected to the handle. The handle is movable between an off position and an on position. The locking mechanism configured such that: the second door is locked in a closed position when the handle is in the on position; the second door is movable from the closed position to an open position to expose the second compartment when the handle is in the off position; and the handle is locked in the off position when the second door is in the open position.

A door locking device of a distribution board of an air circuit breaker, including a transmission shaft transmitting power for drawing in and out a circuit breaker body, a shaft link rotatably coupled to one end of the transmission shaft, a link rod having one end rotatably coupled to a portion of the shaft link, a cam plate rotatably coupled to the other end of the link rod and pushing or pulling the circuit breaker boy, and a constraint plate installed in a distribution board door, further includes a pressing part protruding from a portion of the link road, and a hook plate rotatably coupled to a side of the cradle and having one end in contact with the pressing part to receive rotational force and the other end restricting or releasing the constraint plate, wherein the hook plate releases the constraint plate in a disconnection position.

A safety switch includes a housing including first and second compartments that are separated by a barrier, a switch mechanism in the first compartment, one or more fuse holders in the second compartment, a first door connected to the housing and covering the first compartment, a second door connected to the housing, a handle connected to the switch mechanism, and a locking mechanism operatively connected to the handle. The handle is movable between an off position and an on position. The locking mechanism configured such that: the second door is locked in a closed position when the handle is in the on position; the second door is movable from the closed position to an open position to expose the second compartment when the handle is in the off position; and the handle is locked in the off position when the second door is in the open position.

A device for supplying electric power includes a rectifier, an adaptive voltage clamping circuit, and a DC-DC voltage regulator. The rectifier receives electrical power, and is electrically connected to an input line of the adaptive voltage clamping circuit. The adaptive voltage clamping circuit includes a power transistor, a voltage feedback circuit, and a controller. The DC-DC voltage regulator is electrically connected to the adaptive voltage clamping circuit and, in one embodiment an actuator. The controller monitors the voltage feedback circuit and controls the power transistor to a fully open state to transfer electric power to the DC-DC voltage regulator when the voltage level supplied to the DC-DC voltage regulator is less than a threshold. The controller controls the power transistor in a linear state to regulate the voltage transferred to the DC-DC voltage regulator when the voltage level supplied to the DC-DC voltage regulator is greater than the threshold.