Abstract: Access to the arc chutes of a contactor is provided by mounting the arc chutes along with insulating plates on the top surface of a frame which supports the parts of the contactor. A track is formed as a pair of grooves in a top surface of the frame. The arc chutes have projections on each side which fit into the grooves of the track so that the arc chute may stand on the top surface of the frame of the contactor. Insulating plates are mounted in sockets made into the top surface of the frame and provide electrical insulation for the arc chutes.

Abstract: An assembly supporting a plug-on switch unit on a mounting pan pivotally supported within a unit enclosure of an electrical control center and movable between a first position in which the plug-on jaws of the switch unit are connected to respective bus bars within the motor control center and a second position in which the plug-on jaws are spaced away from the bus bars. The assembly includes a handle operator movable between a first position indicating that the switch unit is in an "OFF" condition and a second position indicating that the switch unit is in an "ON" condition. Interlock features are provided to prevent movement of the mounting pan from its first position to its second position unless the handle operator is in its first position and also to prevent removal of the unit enclosure from the motor control center unless the mounting pan is in its second position.

Abstract: An apparatus is disclosed for mounting an auxiliary contact external to an electromagnetically operated electrical contactor so that the auxiliary contact may be operated by a carrier of the contactor. The apparatus comprises: a wall of the auxiliary contact; at least one rib projecting from the wall of the auxiliary contact, the at least one rib arranged to be matingly inserted into at least one slot in an external side of the contactor so that the rib attaches the auxiliary contact to the contactor; and, a flexible lever formed from a portion of the wall, and the lever locks into a mating structure when the rib attaches the auxiliary contact to the contactor in order to lock the auxiliary contact in position on the external side of the contactor.

Abstract: The invention provides an interlock mechanism between an electromagnetic contactor and a hand operated isolation switch which both prevents operation of the isolation switch when the contactor is in the contact closed position, and also limits the force which may be applied to the contactor by an operator through operation of a hand lever. The invention provides a door interlock mechanism for an enclosure where the enclosure has a door, an isolation switch is mounted inside the enclosure, an operating handle for operating the isolation switch is mounted on the exterior of the enclosure, an electromechanical device is mounted inside the enclosure, the electromechanical device has a movable armature, and the armature has a first armature position and a second armature position. A flag attached to the armature has a first flag position when the armature is in the first armature position, and has a second flag position when the armature is in the second armature position.

Abstract: A switching AC voltage regulator including a transformer, two solid state AC switches, and sensing means controlling the switches to produce the desired output voltage. The two switches conduct alternately and are switched at a rate much higher than the frequency of the regulated AC voltage. When the first switch is activated, the transformer is shorted out, causing the output of the transformer to equal the input. When the second switch is activated, normal transformer action occurs, creating an output voltage either higher or lower than the input, depending on the transformer arrangement. The duty cycle of the switches is varied to provide precise control of the output voltage.

Abstract: A modular switch-fuse unit is provided which can be engaged via terminals 26 with a busbar supply system. The unit is divided into a switch compartment 14 and a fuse compartment 16, the latter having an access door 36 which is normally blocked by operating handle 38 when in the "on" position. Handle 38 is provided with a semi-concealed latch 64 allowing access to the fuses 32 when live.

Abstract: The disclosure depicts a novel pushbutton switch mechanism having a pair of pushbutton switches with electrical contacts and an interlock mechanism between the switches. The interlock mechanism comprises; a shoulder on each of the pushbutton switches, an interlock plunger for contacting the shoulders of the pushbutton switches, and a return spring in contact with the interlock plunger for retaining the plunger in a predetermined position. A plunger support and a plunger guide in the pushbutton switch mechanism for defining an area in which the interlock plunger is contained. When one of the pushbutton switches is depressed, the interlock plunger contacts the shoulder of the other pushbutton switch thereby preventing the other pushbutton switch from being depressed simultaneously.

Abstract: An electric receptacle for trade size outlet boxes having a ground fault circuit interrupting mechanism incorporated therein. A receptacle housing includes contact jaws seated therein to receive the plug of a conductor leading to a load, electronic components to detect a ground fault and grounded neutral condition on the load side of the receptacle, plus a coil and trip mechanism to open the receptacle circuit on occurrence of a ground fault or grounded neutral condition. The complete receptacle assembly is approximately the same depth as conventional household receptacles which do not have ground fault circuit interrupting means included therein. Means to periodically test the ground fault interrupting mechanism is also included in the receptacle assembly, as well as means to indicate the circuit has been interrupted and means to reset.

Abstract: A magnetic latch for a clapper type contactor having an electromechanical system comprising an operating coil, a coil core, a magnet frame, and an armature includes a magnetic latch plate. The magnetic latch plate includes a stop portion having a pair of ears mounted on a pivoted contact arm. The stop portion of the latch abuts against the magnet frame before energization of the coil so that a flux path includes the core, the magnet frame, the magnetic latch, the armature and the air gap between the armature and core of the coil.