Abstract: An actuator for another tool includes a housing that is either modular and attachable to the tool or may be incorporated into the another tool. Within the housing is a biasing member that may be retained in a compressed condition by a retainer. A trigger holding the retainer, the trigger having a trigger head anchorable to the housing, a separation neck having a helical groove therein and a trigger body, the body being connected to the retainer, the trigger being defeatable on command.

Abstract: Terminal blocks including integral safety relays having independently testable contacts are disclosed. An example apparatus includes a terminal block body couplable to an electronics cabinet or mounting rail. The terminal block body includes a first slot to receive a first circuit and a second slot to receive a second circuit. The apparatus includes a first contact and a second contact that are externally accessible when the terminal block body is coupled to the electronics cabinet or the mounting rail. The apparatus includes a first switch and a second switch to selectively couple the first contact and the second contact and a test point coupled between the first switch and the second switch. The test point is to enable the first switch and the second switch to be independently testable to verify operability when the terminal block body is coupled to the electronics cabinet or the mounting rail.

Abstract: A disconnector for electric power equipment filled with dielectric liquid, especially transformers, applicable in protecting the operation of electric power equipment. The disconnector contains at least two cylindrical current-limiting fuses situated inside a tank, and each fuse is electrically connected with external phase power supply and through fixed contacts and moving contacts of the disconnector with the active part of the piece of electric power equipment. The disconnector is characterized in that the current-limiting fuses are placed in a common housing, in which a slide with a pilot is situated, and to the slide there are inseparably fixed moving contacts, which move together with the slide when the slide makes a to-and-fro motion. The to-and-fro motion takes place as a result of the operation of a tripping device situated in the current-limiting fuses and of the compression or stretching of springs fixed to the pilot and to a fixing disk.

Abstract: A fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and switchable contacts for connecting the fuse to circuitry. A tripping mechanism is provided to disconnect the switchable contacts when predetermined circuit conditions occur.

Abstract: A fuse block for cabinet mounting provides a shaft that may exit a side of the cabinet to be received by a handle mounted on that side. A finger attached to the inner cabinet door provides for an interlock by engaging with a bolt communicating with the shaft preventing inadvertent opening of the cabinet when the fuse block is connected to power and/or connecting the fuse block to power when the cabinet door is open.

Abstract: A bridge switch consists of a fusible link between two balanced electrical loads connected in parallel. This fusible link stops a movable member from completing a secondary circuit. When that fusible link is destroyed the movable member is allowed to close the electrical contact(s) that will cause power to go to a secondary circuit. When one side of the parallel circuit to which the bridge switch is connected fails causing current to flow through the fusible link at a rate high enough to destroy that link allowing the movable member to activate the secondary circuit and/ or removing power from the primary circuit. More than one bridge switch may be employed in the total circuit where the second bridge switch is connected across two elements of the secondary circuit with the movable member restoring power to the primary parallel circuit without removing it from the secondary parallel circuit. This would then create a third parallel circuit.

Abstract: In the representative embodiments of the several methods and apparatus of the invention disclosed herein, a movable detonating member is arranged to be selectively impelled against an impact-responsive detonator on a well bore perforator having one or more explosive devices. The movable detonating member is initially restrained from moving in relation of the tool body by a heat-responsive material which, in one embodiment, is operative to release the detonating member when an electrical heater on the tool is initiated from the surface for melting the bonding material or, in another embodiment, releases the detonating member when the material melted by elevated well bore temperatures.

Abstract: In the representative embodiments of the several methods and apparatus of the invention disclosed herein, a movable detonating member is arranged to be selectively impelled against an impact-responsive detonator on a well tool having one or more explosive devices. The movable detonating member is initially restrained from moving in relation of the tool body by a heat-responsive material which, in one embodiment, is operative to release the detonating member when an electrical heater on the tool is initiated from the surface for melting the bonding material or, in another embodiment, releases the detonating member when the material is melted by elevated well bore temperatures.

Abstract: A filament switching device is arranged to be mounted within the screw base of a conventional, dual-filament, incandescent light bulb. The device has a frame which branches around the evacuation tube of the bulb thereby allowing sufficient room for switching components within the device and yet avoiding interference with the evacuation tube of the bulb. Mounted within the frame of the switching device is a fixed contact and a cantilevered contact. The cantilevered contact can swing in a direction transverse to the evacuation tube to make electrical contact with the fixed contact. The cantilevered contact is held separated from the fixed contact by a fusible conductor. Upon failure of one of the filaments in the bulb a surge of current flows through the fusible conductor, parting it and allowing the cantilevered contact to swing into electrical contact with the fixed contact. This swing of the cantilevered contact substitutes the failed filament with the other filament.

Abstract: A remotely actuable switch includes a housing defining a cavity having first and second thermally separated chambers, each enclosing a pair of spaced electrical contacts and each having an associated heating element. An electrically conductive fusible element occupies one of the chambers and electrically bridges the spaced contacts therein. To activate the switch the first heating element is activated to melt the fusible element, allowing a Lorentz force resulting from an applied external magnetic field and from current passing between the bridged contacts to expel the melted fusible material from the first chamber into the second chamber. A helical passage may be used as an alternative to a cavity with discrete chambers.