Abstract: With the intention of simplifying the replacement of an operating device (4) of an air insulated switchgear (1) having a power circuit breaker (3), the operating device has been made dockable. By dockable is meant that the operating device can be readily removed from and replaced on the circuit breaker, i.e. can be separated from and connected to the circuit breaker without needing to influence the function thereof. This has been made possible by providing the operating device with guide parts, such as a splined, rotatable outward shaft, and by providing the switchgear with guide parts which correspond to and receive the guide parts on said shaft, for instance a splined hole provided in a shaft for operating the circuit breaker and receiving and cooperating with the splined shaft. In modern switchgear, the operating device is damaged more often than the circuit breaker, and a dockable operating device enables the device to be removed readily without affecting the circuit breaker function.

Abstract: The locking device of a plug-in and disconnection mechanism for a circuit breaker comprising a kinematic transmission system driven by a removable crank comprises a main locking catch able to take a closed position in which it prevents the crank from being fitted and an open position in which it enables the crank to be fitted, at least one operating cam and lever mechanism designed to take information representative of one or more positions of the circuit breaker and to prevent passage of the mobile element of the main locking catch to its closed position when none of these positions is detected, and an operating mode selector. In the embodiment with one cam and lever mechanism, the selector enables the cam and lever mechanism to be activated or neutralized. In the embodiment with two cam and lever mechanisms, the selector enables one or the other of the two cam and lever mechanism to be selected.

Abstract: Electrical switchgear for receiving either a vacuum circuit breaker or a dummy element and including a levering-in assembly with a positional interlock bar that is operated by a levering-in block in the levering-in assembly and by a finger on the dummy element. Access to the levering-in device is blocked when the source breaker is in the connect position. A key to unlock the access is obtained by levering the source breaker or a dummy out to the test position and locking it in that position or by levering a dummy element to a connect position and locking it in that position.

Abstract: The electronic device comprises a casing, an insertion port through which an electronic package is inserted in the casing, a power input inlet which is provided in the casing for connection to a power input cord, and a protection member capable of moving between a first position in which it opens the insertion port and blocks the inlet and a second position in which it blocks the insertion port and opens the inlet. The protection member comprises a first portion capable of blocking the insertion hole, a second portion capable of blocking the power input inlet, and a pivotable supporting portion between the first and second portions. The insertion hole can be covered by an closure having an end projection engageable with the protection member.

Abstract: A sliding frame for a movable power switch with a break contact arrangement is provided. The sliding frame includes protective plates mounted in front of the break contacts. To move the protective plates, there are rockers with pivoting arms together with control levers acted upon by the movable switch. The arrangement is shallow and the protective plates may be locked for incoming and outgoing connections.

Abstract: An arrangement for controlling the movement of a drawout circuit-breaker, mounted in a switchgear, which can be moved in an operating position, test position and disconnect position relative to a drawout frame using an actuating shaft pivoted in the drawout frame and operated by a detachable actuating crank. A controllable closure member enables or prevents the actuating crank from coming into contact with the actuating shaft, and the drawout circuit-breaker can be removed from the drawout frame after a door is opened. Such arrangement is used in low-voltage circuit-breaker equipment.

Abstract: An electrical apparatus housing having a door for accessing the apparatus within the interior of the housing and a switch for activating the apparatus accessible from the exterior of the housing. When in the on position, the switch is operable to block the door from being opened; thus functioning as an interlock to prevent access to the interior of the housing when the apparatus is activated. The invention includes a key for bypassing the interlock so that under certain circumstances the housing door can be opened while the equipment is operating, so it can be tested in its energized state.

Abstract: The electrical connector (24) of the present invention includes a coupling (26, 26') for attaching the connector (24) to an equipment cabinet (10) that will permit a certain amount of movement of the connector along the mating axis (64) after mating with a mating connector (32). The coupling (26, 26') includes U-shaped channels (68) attached to the cabinet that receive rollers (88) attached to the connector. The rollers have a V-shaped groove (98) that receives a circular portion (112) of a spring (108) for holding the connector (24) in position during mating but will expand allowing the mated connector pair (24, 32) to move along the mating axis (64) after mating.

Abstract: A snap door including a door housing, a door body, a latch switch and a spring, in which one side of a lower plane of the door housing is open for placing a PCB mounted with plural control switches therein. The door body includes a lower case, an upper cover, a knob assembly and a front cover. The knob assembly has a knob holder, plural remote control knobs and plural resilient bridge portions extending between the knob holder and remote control knobs. The knob holder is attached to a lower plane of the upper cover. Respective remote control knobs are formed by extension members extending to the rear side from the resilient bridge portions of the knob assembly, control buttons projectingly installed to the front side of upper planes of the extension members, and switch operative projections protrudingly installed to lower planes of the extension members. Respective remote control knobs are arranged to allow the switch operative projections to be placed on the upper portions of the control switches on the PCB.

Abstract: An enclosure for electronic modules, comprising walls made of composite material including conductive fibers for shielding the enclosure interior from electromagnetic radiation, and means for securely mounting at least one module inside the enclosure with a fastener means, the mounting means comprising composite material.

Abstract: An interlock arrangement between a pair of industrial rated circuit breakers in adjoining circuit breaker compartments utilizes a pair of circuit breaker interlock units, one mounted on the rear surface of each circuit breaker. A corresponding pair of compartment interlock units are arranged within the circuit breaker compartments for interaction between the two circuit breaker interlock units to open the contacts within one of the circuit breakers when an attempt is made to electrically connect the circuit breaker within one compartment when the circuit breaker in the adjoining compartment is already electrically connected within the adjoining compartment.

Abstract: The switch cabinet (50) exhibits a housing, which is provided with a door and which includes a box-shaped switch (1). The switch (1) can be brought by a pushing movement inside the switch cabinet (50) into a connected position or into a disconnected position, and exhibits a fixed part (2) mounted in the switch cabinet housing, and a movable housing body (3) which interacts with the fixed part (2) and can be removed from the housing. Furthermore, the switch (1) contains a disconnecting device for achieving the disconnected position or the connected position, and a switching lever (4) guided to the outside through a first opening (6) provided in the door (7). Provided in the door (7) of the switch cabinet housing is a second opening (11) which serves to guide through a tool (8) which facilitates the operation of the disconnecting device with the door (7) closed.This switch cabinet fulfills particularly strict safety requirements.

Abstract: A manually rotatable latch of a control unit has an oblong cross-section shalt extending through a keyhole slot in a slider, the wide dimension of the shaft being greater than the narrow portion of the slider, to block movement of the slider when the latch is extended to lock the unit to the cabinet or block insertion of the unit to the cabinet. A link from the slider extends into the path of movement of an operator to block movement of the operator to an ON position of switching apparatus of the control unit when the latch is extended. The link takes advantage of optimal latch location substantially centered in the control unit to minimize twisting of the unit within the cabinet when removal is attempted without releasing the latch.

Abstract: Cradle assembly comprises a breaker-engaging frame slidably coupled to an enclosure-engaging frame. The enclosure will have a rear wall provided with forwardly extending stationary terminals. The breaker will have rearwardly facing terminals aligned for engaging the stationary terminals. The rear wall of the enclosure is fixed relative to the side walls of the enclosure. The enclosure-engaging frame of the cradle assembly engages the side walls as the breaker is mounted to the breaker-engaging frame. The cradle assembly facilitates moving the breaker between a connected and disconnected position. In the connected position, the breaker terminals are engaged with the enclosure stationary terminals. In the disconnected position, the breaker terminals are disengaged and spaced from the stationary terminals.

Abstract: In a data processing device, when exchanging a plug-in package with another without breaking the power to be supplied to the data processing device, a package removing lever is equipped with a locking piece. The lever does not move and the package hence cannot be removed, until the locking piece is released. In response to the release operation of the locking piece, a switch is activated to break off the power supply for the package. After the package is mounted perfectly, the power for the package is switched on by the action of the locking piece, thus preventing any misoperation when removing the package.

Abstract: In a data processing device, when exchanging a plug-in package with another without breaking off the power to be supplied to the data processing device, a package removing lever is equipped with a locking piece. The lever does not move and the package hence cannot be removed, until the locking piece is released. In response to the release operation of the locking piece, a switch is activated to break off the power supply for the package. After the package is mounted perfectly, the power for the package is switched on by the action of the locking piece, thus preventing any misoperation when removing the package.

Abstract: A circuit breaker assembly is equipped with a pre-tripping device comprising a fixed cam securedly united to a connecting base, which cooperates with a rocker and a transmission lever when the circuit breaker is drawn-in and drawn-out from the connecting base. The profile of the fixed cam is chosen to actuate the transmission lever and impose tripping of the circuit breaker, during draw-in or draw-out travel, whereas the transmission lever is in the inactive position after the circuit breaker is drawn-in or drawn-out, in which the latter can be opened or closed normally.

Abstract: The sliding mechanism (50) of a drawout type switchgear has a first slide arm (5) which is slidably supported by the upper and lower support rails (3A, 3B) and a second slide arm (7) which is slidably supported by the first slide arm (5). The second slide arm (7) is interlocked with the first slide arm (5) by a lock plate (12) when the first slide arm (5) is sliding from a connected position to a final drawout position of the first slide arm (5). When the first slide arm (5) reaches the final drawout position of the first slide arm (5), the interlocked second slide arm (7) is released by rotation of the lock plate (12).

Abstract: A circuit board injector/ejector device for use with a circuit board to be accommodated in a rack housed in an enclosure comprises a body adapted to be secured to a front plate secured to the circuit board and a lever pivotally mounted on the body. The device is adapted to assist in providing the force necessary to effect a multiplicity of pin and socket connections at the rear of the circuit board when the circuit board is introduced into a rack and to assist in providing the force necessary to effect disconnection of the multiplicity of pin and socket connections at the rear of the circuit board when the circuit board is withdrawn from the rack.

Abstract: A Faraday shield minimizes the leakage of electromagnetic interference (EMI) and radio frequency interference (RFI) of a maximum frequency and corresponding wavelength that emanates from electronic components contained within the shield. The top and bottom each contain apertures that are dimensioned to effectively block the escape of EMI and RFI from the shield and to permit the flow of air to dissipate heat without generating acoustic noise. The thickness of the top of the shield is at least one half of the diagonal length across the largest of the apertures located in the top. The length of the longest aperture side is less than one fourth of the wavelength of the maximum frequency of EMI and RFI contained by the shield. Corresponding relationships exist between the apertures located in the shield bottom and its thickness.