Abstract: An integrated protection unit is an electronic trip circuit breaker which includes basic overcurrent protection facility along with selective electrical accessories. A molded plastic accessory access cover secured to the integrated protection unit cover protects the accessory components contained within the integrated protection unit cover from the environment. A combined overcurrent trip actuator and multiple accessory unit can be field-installed within the integrated protection unit. The combined actuator-accessory unit includes electronic control circuitry for the accessories along with mechanical trip and reset interface components. Additionally, a bell alarm signal unit can be incorporated within the trip actuator and multiple accessory unit enclosure.

Abstract: This luminaire comprises a metal housing surrounding an internal space and having a mouth at the front side of the housing. Within the housing is a double-ended lamp comprising a tube of transparent material and terminals at opposite ends of the tube. Also within the housing is a pair of sockets, each comprising contact structure for receiving one of the terminals and a ceramic support for supporting said contact structure. A ceramic reflector partially surrounds the tube. This ceramic reflector and the ceramic supports of the sockets constitute portions of a single integral ceramic piece that is adapted to be inserted through said mouth into said internal space as a single unit during assembly of the luminaire.

Abstract: A discharge lamp luminaire is disclosed having improved mounting means for electrical circuit components employed in the lamp ballasting circuitry. The improvement is attributable to a particular mounting bracket securing the electrical circuit component or components in place. A street lighting luminaire having such mount construction is also disclosed.

Abstract: A digital circuit interrupter includes a microprocessor programmed for tailored overcurrent protection to power systems. A communication link permits the over-current set points to be selectively set within the microprocessor memory from a remote location. The over-current trip parameters are then derived by an algorithm which resides in the microprocessor memory.

Abstract: A metal halide lamp having a vacuum shroud is disclosed. The vacuum shroud substantially eliminates the detrimental catephoresis effects of operating a metal halide lamp from a low frequency alternating current (A.C.) source or direct current (D.C.) sources, reduces the sodium migration losses typically experienced with a metal halide lamp, reduces the photoelectrons contribution to sodium losses for the metal halide lamp, reduces the detrimental effects of the hydrogen and water that may be within the general confines of such a metal halide lamp, and provides a containment function for an inner envelope that may be operated at a relatively high pressure and possibly experience rupturing to cause the dislodgment of the ruptured material to possibly fracture a glass member confining the metal halide lamp.

Abstract: A molded case circuit breaker movable contact arm electrically connects with the circuit breaker load terminal without requiring a flexible electrical conducting braid. The contact arm is pivotally arranged within a contact arm support to which the load terminal lug is attached. The contact arm pivot pin is supported on a pair of parallel support posts extending from the contact arm support and a pair of bifurcated shunt plates are positioned on the pivot pin, one on each side of the contact arm to promote good electric transport between the contact arm and the support posts during short circuit conditions without interfering with the rotational movement of the contact arm.

Abstract: This ballast system for a gaseous discharge lamp comprises a reactor coil and core structure forming a magnetic circuit for flux developed by power-frequency current through the coil during lamp operation. The core comprises a leg surrounded by the reactor coil, two yokes at opposite ends of the leg, and flux-return structure connected between the two yokes radially outside the coil. For developing a high-voltage, high-frequency pulse for initiating lamp operation, there is provided an ignitor coil surrounding the flux-return structure and the reactor coil and inductively coupled to the reactor coil with respect to high-frequency pulse components.

Abstract: A compact current limiting circuit breaker with an electronic trip unit arranged within the circuit breaker cover and current transformers in the circuit breaker case incorporates reinforcement ribs in the cover to provide added strength. The cover also includes line terminal plugs that removably attach to the cover for preventing inadvertent access to the circuit breaker line terminals when the circuit breaker is energized. Protrusions formed on the bottom surface of the circuit breaker cover under the trip unit provide further strength while cooperating with flexible pads on the top of the current transformers to automatically compensate for manufacturing tolerances.

Abstract: A multiplexed transmission scheme that reduces the complexity of the normal electrical wiring harness of a vehicle is disclosed. The system directly routes electrical excitation to motorize devices and multiplexes the control of the motorized devices along with the control of lighting devices by means of an optical transmission scheme having a high intensity light source as its source of light energy. Various devices are disclosed that interface with a control buss, light busses, and power buss all related to the multiplexed system. Further disclosed are related optical devices that allow the operator of a vehicle to provide commands to the multiplexed transmission scheme so as to provide control of all of the operator selected electrical devices of the vehicle.

Abstract: An electric busway system consists of a plurality of planar bus bars insulated from each other and bolted together for good mechanical strength and for efficient thermal conductivity. The bus bars are additionally perforated to promote convective air current flow through the perforations when the bus bars are mounted in the horizontal plane.

Abstract: This headlamp for a motor vehicle comprises a lens that has a front surface that slopes backwardly from bottom to top of the lens. In localized regions of the lens, there are spread flutes, each comprising alternating ridges and grooves on the back surface of the lens. The individual ridges extend in a direction between the top and bottom of the lens and are characterized by having the form of a segment of an inverted, base-up cone. The individual grooves extend in a direction between the top and bottom of the lens and are characterized by having the form of a segment of an upright, base-down cone. The coniform configuration of the individual ridges and grooves serves to lift the edges of the light beam passing therethrough and thereby compensate for the tendency of the beam to droop at its edges as a result of the backward slope of the front surface of the lens.

Abstract: For converting a lamp with a screw-type base into a lamp with a bi-pin base, there is provided a cup-shaped adapter of electrical insulating material comprising a tubular body containing a bore that has internal threads threadedly receiving the external threads on the usual metal shell of the screw-type base. The adapter further comprises an end wall extending across the bore at one end of the tubular body and carrying two conductive pins extending through the end wall in laterally-spaced relation. First conductor within the adapter connected to one pin has a free end that engages the usual coniform end of the metal shell when the base is threaded into said bore, thereby establishing an electrical connection between the metal shell and said one pin. Second conductor connected to the other pin establishes an electrical connection between the usual eyelet of the base and the other pin when the base is threaded into said bore.

Abstract: A combined arc gas controller-line terminal plug is used within molded case circuit breaker covers to direct the flow of arc gases that occur during intense overcurrent circuit interruption. The plugs simultaneously prevent access to the line terminal lugs while controlling the egress of the arc gases. Moreover, the plugs are removable for connection with and disconnection from an associated electrical power distribution system.

Abstract: Circuits, and methods of using the same, are disclosed for controlling the power supplied to a discharge lamp of the type having a closed inductive loop, such as the resonant ballast circuit for a fluorescent lamp or the inductive ballast loop of a high pressure sodium lamp, wherein the closed inductive loop is operated by an electrical power supply having a d-c input stage and an output power controlled by the switching frequency of a switch means within the power supply itself whereby current flows to the closed inductive loop when the switch means is conductive and no current flows from the power supply to the closed loop when the switch means is non-conductive.

Abstract: A universal circuit breaker interlock arrangement allows two circuit breakers to be interlocked such that only one of the circuit breakers is on at one time. The circuit breakers can be interlocked, per se, or when used with an electrical motor operator or with a manual rotary operator. The slidably mounted interlock arrangement also allows interlock function between two electric switches as well as between an electric switch.

Abstract: The output terminals of a three-phase, wye-connected AC source, whose voltage varies over a wide dynamic range, are connected to a pair of DC voltage buses through a pair of oppositely poled, half-wave rectifier networks and a pair of switches. Taps uniformly positioned on the phase windings are brought out through another half-wave rectifier network directly to one bus, and the source neutral is connected directly to the other bus through a diode. A control circuit, operating in response to the DC voltage appearing across the buses, opens and closes the switches to selectively switch the rectifier networks and diode in and out so as to limit the DC voltage to a predetermined, compressed dynamic range.