Abstract: A bushing wherein the voltage stress across the surface of the bushing is alleviated by placement of a layer of insulating material in direct contact with the surface. The insulating material is preferably a high-voltage type, heat-shrinkable, halogen-free polyolefin, and is preferably fully shrunk to conform to the contours of the outer surface of the bushing.

Abstract: An interrupter actuator comprising a frame, a pivot lever mounted on the frame for pivotal movement relative thereto about a first axis and between first and second positions, an operating lever mounted on the pivot lever for pivotal movement relative thereto about a second axis spaced from the first axis, and the operating lever being moveable between an open position and a closed position, and a linkage for opening an interrupter in response to movement of the operating lever when the pivot lever moves to the second position, for opening the interrupter in response to movement of the operating lever to the open position when the pivot lever is in the first position, and for closing the interrupter in response to movement of the operating lever to the closed position when the pivot lever is in the first position.

Abstract: A manually actuable load break switch actuated having a base mounted on one end of a vacuum actuated switch, an operating lever pivotally mounted on the base and operatively connected to open and close the vacuum switch, a toggle mechanism connected to the end of the operating lever, the toggle member including a compression spring for biasing the operating lever to the closed position, a manually actuated handle pivotally mounted on said base for tripping the toggle mechanism by movement from one side of the toggle mechanism to the other, spring means operable connecting the handle to the toggle mechanism, and a lock pin biased into engagement with the end of the lever to lock the lever in the switch open position.

Abstract: A direct acting undervoltage release device utilizes stored spring energy to trip a circuit breaker when the control voltage reduces to a critical level (the "undervoltage"). The device includes a solenoid that senses the undervoltage, and a charging motor that automatically resets the device after a tripping operation (provided the control voltage recovers to its normal level). The direct acting feature is achieved by providing a chargable trip spring and a trip pin in the circuit breaker which directly drives the latch bar of the breaker to trip the breaker.

Abstract: A current limiting circuit interrupter includes two parallel pivoting contact arms carrying contacts at the ends thereof. The upper contact arm is pivoted upon a carriage which is in turn pivotally mounted upon a mechanism frame. A latch rod is movably secured in arcuate slots in the sides of the mechanism frame. When the circuit interrupter is in the closed circuit position, a pair of springs connected between the latch rod and the carriage urges the latch rod against a reaction surface of the upper contact arm to provide contact closing pressure. Upon occurrence of severe overload current conditions, the upper contact arm pivots upon the carriage, moving the latch rod within the arcuate slots to release the contact closing pressure, allowing the springs to move the latch rod against a latching surface of the upper contact arm to latch the upper contact arm in the open circuit position.

Abstract: A circuit interrupter includes two parallel pivoting contact arms, the lower of which is connected to a stationary conductor member using a clinch-type contact. The contact arm has an axle member rigidly attached thereto which is supported by a bearing member attached to the conductor. In one embodiment, the bearing member comprises a pair of bifurcated arms which are clamped about each end of the axle member. In an alternative embodiment, the conductor member lies generally parallel to the lower contact arm and is slotted to form a pair of elongated conductor arms, each of which supports a journal bearing member. One end of the axle is extended through each journal bearing.

Abstract: A current limiting circuit breaker includes two parallel pivoting contact arms carrying contacts at the ends thereof. The upper arm is double pivoted and is operated by a mechanism between open and closed positions. A magnetic drive slot motor device surrounds the lower arm and operates during extreme overcurrent conditions to draw the lower arm down and aid in rapidly separating the contacts. An arm positioning assembly is spring loaded to bias the lower arm toward a closed circuit position and provide contact closing force, the upper limit of travel being set by a rod extending through the end of the lower contact arm to abut against the slot motor.