Abstract: An apparatus and method for temperature-dependent transient blocking employing a transient blocking unit (TBU) that uses at least one depletion mode n-channel device interconnected with at least one depletion mode p-channel device. The interconnection is performed such that a transient alters a bias voltage Vp of the p-channel device and a bias voltage Vn of the n-channel device in concert to effectuate their mutual switch off to block the transient. The apparatus has a temperature control unit that is in communication with the TBU and adjusts at least one of the bias voltages Vp, Vn in response to a sensed temperature Ts, thereby enabling the apparatus to also respond to over-temperature. In some embodiments the p-channel device is replaced with a positive temperature coefficient thermistor (PTC). The temperature control unit can use any suitable circuit element, including, among other a PTC, resistor, negative temperature coefficient element, positive temperature coefficient element, transistor, diode.

Abstract: A display includes a casing, a terminal module, and a light source. The terminal module is mounted on an exterior of the casing, and includes a terminal unit. The light source is mounted on the casing and the terminal module, and serves to illuminate the terminal unit of the terminal module.

Abstract: The present invention relates to a method of manufacturing surge arrestors, the method including stacking varistors; and forming a coating of composite material on the stack. Between these steps, also included is placing a bead of flexible, adhesive, and dielectric material on the previously formed stack in register with the various interfaces between each pair of adjacent varistors.

Abstract: The invention relates to a surge voltage protector (1) which comprises a discharge current path with at least one varistor block (4a, 4b, 4c). In order to prevent the varistor blocks (4a, 4b, 4c) from bursting when an inner error is produced and an electric arc connected thereto is created, a coating (9, 9a, 9b, 9c) is applied in the region of the outer covering area of at least one varistor block (4a, 4b, 4c), said coating being made of a substance which triggers an electric flashover when a critical temperature of the varistor blocks (4a, 4b, 4c) is exceeded.

Abstract: Disclosed is a module (10) having pins (16-24) connected to respective conductor tower strips (46, 48, 50, 52). Pairs (46, 50 and 48, 52) of the conductor tower strips are spring biased toward each other to capture therebetween respective PTC current limiting elements (64, 70). A spring member 60 is connected to a ground pin (24) at one end, and to an overvoltage sensitive assembly at the other end, via a soldered heat transfer member (92). The overvoltage sensitive assembly includes overvoltage semiconductor devices (76, 77, 79) soldered thereto. When an overvoltage condition is sensed, the heat generated by the devices melts the solder between the heat transfer member (92) and the spring member (60), whereby lateral arms (90) of the spring member (60) move and engage the conductor tower strips (50, 52). The tip and ring pins (16, 18) of the module (10) are not only shorted together, but are shorted to ground.

Abstract: A suppression device for an electronic appliance having a plug-in device which has at least one plug-in element and is designed for attachment to a housing of the electronic appliance, with a capacitor having at least two capacitor plates being provided in order to improve the electromagnetic sensitivity. In a simple and low-cost suppression measure for electronic appliances, which is also suitable for mass production, the capacitor is arranged outside the housing of the electronic appliance and is electrically connected firstly to a plug-in element of the plug-in device and secondly to the potential of the electrically conductive housing.

Abstract: A safety device for monitoring heat in electrical installations includes a first connecting element in thermal relationship with an electrical connection to be monitored, a second element designed to be connected to ground, and an electrical connecting structure that connects the two elements and can adopt two states, one an insulating state in normal operating conditions and the other an interrupting state wherein there is contact and hence grounding of the first element with the second when a critical temperature is reached. The electrical connecting structure may include a fusible ring that releases a piston, or an insulative thermoretractable sheet that retracts.

Abstract: A heating element and a process for conducting the operating heat of a semiconductor switch to a heating cell which is triggered by the semiconductor switch via first and second heat and current conducting material strips and a frame terminal with an interposed heat-conducting insulating film. The semiconductor switch is provided with a cooling fin and is applied directly to a surface of the first heat and current conducting material strip.

Abstract: The invention is directed to a surge arrestor having a middle electrode and at least one outer electrode, in which an electrically conductive spring clip is secured to the middle electrode and exerts a spring power on the outer electrode; in which an electrical component part that is non-conductive at the trigger voltage of the surge arrestor and generates heat given a flow of current is arranged between the spring clip and the outer electrode; in which the spring clip lies against an electrically conductive contact element that is secured to a spacer element using a fusible mass and that is spaced from the outer electrode; and in which, when the fusible mass melts, the contact element is pressed against the outer electrode by the spring clip. The trigger mechanism has the advantage that it reacts very quickly and thereby reduces the formation of sparks and the fire hazard as well.

Abstract: The invention relates to a protective device for an electric consumer. A residual-current circuit-breaker is located in an electrical supply line between a mains connection and a switch device of the consumer. Said residual-current circuit-breaker has a detection device for recognizing a residual current and a first interrupter for interrupting the supply of electricity from the mains connection to the switch device in accordance with a switching signal from a detection device. If an electrical energy storage device is provided in the switching device, a second interrupter is provided, this second interrupter being controlled by the residual-current circuit-breaker.

Abstract: A surge protector includes a coaxial through-section having a through inner conductor and a through outer conductor, a stub having a stub inner conductor, a stub outer conductor, a first end and a second end. The stub is coupled to the coaxial through-section, wherein the stub inner conductor is conductively coupled to the through inner conductor at the first end of the stub, and the stub outer conductor is conductively coupled to the through outer conductor at the first end of the stub. The stub inner conductor is substantially hollow and having at least one helical aperture disposed therein. A charge elimination device conductively coupled between the stub inner conductor and a grounding device, and a radio frequency short circuit bypass is electrically coupled between the stub inner conductor and the stub outer conductor. A DC injection port is also conductively coupled between the stub inner conductor and the stub outer conductor.

Abstract: The invention is directed to a surge arrestor having a middle electrode and at least one outer electrode, in which an electrically conductive spring clip is secured to the middle electrode and exerts a spring power on the outer electrode; in which an electrical component part that is non-conductive at the trigger voltage of the surge arrestor and generates heat given a flow of current is arranged between the spring clip and the outer electrode; in which the spring clip lies against an electrically conductive contract element that is secured to a spacer element using a fusible mass and that is spaced from the outer electrode; and in which, when the fusible mass melts, the contract element is pressed against the outer electrode by the spring clip. The trigger mechanism has the advantage that it reacts very quickly and thereby reduces the formation of sparks and the fire hazard as well.

Abstract: A surge suppressor conducts heat from a surge protection component (SSC) through a heat conductive element, such as a copper pad, on a printed circuit board, to at least one thermal fuse to cause the thermal fuse to open when the resistance of the SSC begins to decrease, resulting in an increase of heat generated by the SSC.

Abstract: In the fabrication of a surge protector device which utilizes breakdown phenomena of a resistive film, a case which fixes metal bars in it, makes electrical contacts with the metal bars and contains oxidizing and refractory agents, a cap, metal bars and oxidizing and refractory agents are prepared in advance. In the fabrication process of the surge protector device using these elements, a step to control the force applied to the cap, the metal bars and the case so that the force applied to the interface between the resistive films and the mechanical contacts which form electrodes to the metal bars can be controlled. Automation process to fabricate the surge protector device will be realized and efficient fabrication of the precise surge protector device will be also realized. A surge protector device whose breakdown voltage is precisely controlled will be realized reproducibly.

Abstract: A surge protector having a failsafe mechanism including at least one overvoltage protection element, at least one arm assembly, at least one ground element, at least one resilient member, and at least one protrusion. The at least one resilient member is electrically connected to the at least one ground element and the at least one protrusion is generally positioned between the at least one resilient member and the at least one arm assembly. The at least one protrusion is in thermal contact with the at least one resilient member, prevents the at least one resilient member from electrically contacting the at least one arm assembly during normal operation, and is spaced away from the at least one arm assembly.

Abstract: A fuse and filter arrangement having to a polymer fuse apparatus that provides bypass fuse protection. A polymer bypass fuse includes of an electrical conductor wherein a portion of the conductor is surrounded by an internal electrode, which is then surrounded by a layer of polymeric positive temperature coefficient (PTC) material, which is then surrounded by a conductive material similar to that of the internal electrode. The fuse and filter arrangement includes a plurality of in-line and bypass fuses combined with a differential and common mode filter, which itself consists of a plurality of common ground conductive plates maintaining first and second electrode plates between the various conductive plates, all of which are surrounded by a material having predetermined electrical characteristics to provide fail safe filter and circuit protection.

Abstract: A high voltage transient surge suppression system which provides an improved fusing to greatly reduce or eliminate the chance of secondary combustion during an excess power situation. The invention discloses a fuse link system which places one or more fuse links between a first electrical potential and a second electrical potential, and which uses air to insulate or isolate electrical potentials so that products of combustion from an excess power surge do not form a conductive path between electrical potentials on a printed circuit board.

Abstract: Power system overvoltage protection is primarily accomplished by the application of Metal Oxide Varistors (MOVs). MOV voltage limiting capability may be enhanced by the application of power electronics. For instance, capacitor voltage suppression may be accomplished using a DVS system during switching to reduce inrush transient overvoltages or to remove trapped charges. This is achieved by dynamically changing the arrester characteristics. The DVS approach involves integrating an MOV block with anti-parallel thyristor pairs. A single DVS unit may be used to reduce inrush transient overvoltages when energizing. When de-energizing, the trapped charge is suppressed by sequentially bypassing several units. EMTP-based simulations demonstrate the overvoltage reduction may be reasonably accomplished.

Abstract: A voltage suppression device for suppressing voltage surges in an electrical circuit, comprised of a voltage sensitive element having a predetermined voltage rating, the voltage sensitive element increasing in temperature as voltage applied across the voltage sensitive element exceeds the voltage rating. Terminals are provided for electrically connecting the voltage sensitive element between a power line of an electrical circuit and a ground or neutral line of the electrical circuit. A normally closed, thermal switch is electrically connected in series with the voltage sensitive element between the power line and the voltage sensitive element, the thermal switch being thermally coupled to the voltage sensitive element wherein the thermal switch moves from a normally closed position to an open position to form a gap between the thermal switch and the voltage sensitive element when the temperature of the voltage sensitive element reaches a level indicating an over-voltage condition.

Abstract: In order to give an external short-circuit device of a surge voltage protector a current carrying capacity that is as large as possible, a device is made up of a two-armed flexible short-circuit clip whose contact regions are arranged axially to end electrodes. The contact region is formed by two brackets that release a center region of the respective end electrode, and that stand opposite an edge region. An insulating spacer is arranged between a common base of the contact brackets and the edge region of the respective.

Abstract: A coaxial surge protector includes a housing in which is situated a transmission line in the form of a two-sided printed circuit board. The surge protector includes input and output signal connectors mounted on a housing and connected to the transmission line, and a gas discharge tube electrically coupled between the transmission line and circuit ground. A thermally activated shunt assembly is thermally coupled to the gas discharge tube and senses when the gas discharge tube is in an overheating condition. Upon such condition, the shunt assembly provides an electrically conductive shunt in parallel with the gas discharge tube to divert current flowing through the gas discharge tube to flow through the shunt assembly to ground in order to minimize further overheating of the gas discharge tube.

Abstract: A surge arrester includes a mounting bracket, a surge arresting element, an electrically conductive connector, and a fault disconnector. The mounting bracket forms a bracket cup. The surge arresting element is arranged to conduct in the presence of a surge. The electrically conductive connector is electrically coupled to the surge arresting element and forms a connector cup. The electrically conductive connector is received by the mounting bracket so that the bracket cup is received in the connector cup. The fault disconnector is arranged to disconnect the surge arresting element from an electrical line in the event of a fault, and the fault disconnector is housed within the housing formed by the connector cup and the bracket cup.

Abstract: A redundant electric fuse circuit is provided that includes a plurality of fuses coupled in series and each having a fuse control device operable for generating a current through each fuse sufficient to blow the fuse. A first fuse control signal is activated to generate a sufficient current through one of the fuses to blow the fuse. A second fuse control signal is activated to generate a sufficient current through the other fuse to blow that fuse. The electric fuse circuit provides redundancy thereby increasing the yield of integrated circuits by reducing the probability that a defective fuse (i.e., a fuse that reforms after blowing) will cause a fatal defect in the integrated circuit.

Abstract: A circuit for protection of communication lines, including tip and ring lines, each having a protected side and an unprotected side; first and second overcurrent devices connected in series with the unprotected side of the tip and ring lines line; a grounded over-voltage clamping device connected to both the tip line and the ring line at a point intermediate the protected side and the unprotected side, the clamping device being connected to ground; and first and polymer PTC elements connected, respectively, in series with the protected side of the tip and ring lines.

Abstract: A surge protector assembly may be provided with three terminals, a gas discharge tube having a first conductive end and a second conductive end opposite the first conductive end, a pair of metal oxide varistors conductively connected to the ends of the gas discharge tube, and a pair of bracket arms associated with the ends of the gas discharge tube. The bracket arms are movable between a steady-state position in which they cause the first and second terminals to be conductively separated from the third terminal and a shorting position in which they cause the first and second terminals to be conductively connected to the third terminal. The bracket arms are spaced from the ends of the gas discharge tube by a first distance when they are in their steady-state positions and by a second distance when they are in their shorting positions, with the first distance being greater than the second distance, and the bracket arms are spring-biased towards their shorting positions.

Abstract: A protective device for excess current utilizes a fuse that incorporates a printed circuit board. The printed circuit board has a trace on one side which is of a desired width, length, and thickness of material for opening if excess current for a selected duration of time is reached. The printed circuit board is mounted in an insulated housing. The lower side of the substrate may also have a conductive layer connected to the housing or ground. The printed circuit board and overvoltage protector may be tailored for impedance matching. An excess voltage protector may be incorporated with the printed circuit board for conducting to ground if excessive voltage is encountered. The housing has two terminals which are connected to the printed circuit board and voltage protector. These terminals may be conventional coaxial cable connectors.

Abstract: A surge suppressor conducts heat from a surge protection component (SSC) through a heat conductive element, such as a copper pad, on a printed circuit board, to at least one thermal fuse to cause the thermal fuse to open when the resistance of the SSC begins to decrease, resulting in an increase of heat generated by the SSC.

Abstract: A layer of thermal fusible material is placed on one surface of a metal oxide varistor (MOV) to monitor the heating of the MOV due to applied voltage spikes. The thermal fusible material is part of the electrical circuit which includes the MOV and melts at a predetermined temperature. In the presence of a severe or a number of voltage spikes the MOV heats up and the heat transferred to the thermal fusible material causes it to open the electrical circuit to the MOV to prevent overheating and thermal runaway. In another form, the MOV is separated into two halves and the thermal fusible material layer is placed between the ends of the MOV halves.

Abstract: A metal oxide varistor module, and variations thereof for use in surge protectors and the like combining internally a thermally activated disconnect means and an excessive current disconnect means, such that when the module is subject to excessive overvoltage or overcurrent conditions, the connection is interrupted from the phase to neutral, phase to ground and any other combination of voltage or current before the metal oxide varistor device is physically damaged, ruptured or cracked.

Abstract: A thermal overload mechanism for providing protection to tip and ring conductors in a telecommunications system in the event of a power cross occurrence of telephone lines with power lines. The thermal overload mechanism includes a clip having front and rear spring members dimensioned for seating about a spacer element. The spacer element includes one or more recesses defined therein for accommodating securement of solid state devices. The recesses formed in the spacer elements contain a breachable membrane or wall which is breakable in the event the membrane temperature exceeds a predetermined temperature such as a temperature occurring in the event of a power cross situation. A contact configured for seating within the recess between the membrane and solid state device is provided for maintaining electrical contact with the tip and ring wires.

Abstract: An integrated electrical overload protection device and method of formation which functions as a thermal fuse. The device is integrated directly on the underlying structural or foundational material of an electrical circuit which experiences the electrical overstress. The device can be formed according to standard semiconductor process steps when formed on a semiconductor substrate. The device, or fuse, includes a first and second contact area separated by a gap area. A least a portion of the upper surfaces of the contact areas are covered with a wettable material such as gold. A solder bump, or bridge, is applied which spans the contact areas and provides an closed electrical connection. Upon application of an overload condition across the bridge material, a rise in temperature causes the solder material to melt. The solder flows onto the wettable areas and is drawn out of the gap area to thereby disrupt the electrical connection between the contact areas.

Abstract: The device comprises a three-pole lightning arrester, switch means having conductive blades, trigger means having a trigger fuse piece which is thermally connected to the lightning arrester, and conductor means which define input and output line terminals and a ground terminal. The conductor means provide links between the input terminals and the output terminals, between the line electrodes of the lightning arrester and the input terminals, and between a ground electrode of the lightning arrester and the ground terminal. The trigger piece maintains the blades in their first position until a heating limit temperature above which the piece melts and enables the blades to be resiliently returned to their second position. The trigger piece is made up of a recessed central body bearing against the lightning arrester, and of blade-retaining members positioned on either side of the central body so as to secure the blades to the trigger piece.

Abstract: A method for determining the extent of a transient's ability to cause MOV over heating and subsequent explosion by microprocessor analysis of an AC voltage input waveform with respect to a stored perfect sine wave. The microprocessor also calculates the RMS value of the applied voltage waveform and compares it to stored limits to determine if it could cause over heating of the MOV. In either case, the microprocessor will generate an out-of-range signal to a disconnect device to take the MOV, and also the load, if desired, off line until normal line voltage is restored.

Abstract: An AC power distribution system employs a method (900) and apparatus (400) for surge protecting an electrical load connected thereto. The apparatus is coupleable to at least three conductors of the AC power distribution system. A first circuit path (305) of the apparatus electrically couples a first conductor of the AC power distribution system to a second conductor of the AC power distribution system. The first circuit path includes a first thermal protector (337) electrically in series with and operably thermally coupled to a first surge protection device (331). A second circuit path (307) of the apparatus electrically couples the first conductor of the AC power distribution system to a third conductor of the AC power distribution system. The second circuit path includes a second thermal protector (339) electrically in series with and operably thermally coupled to a second surge protection device (333).

Abstract: A safeguard feature prevents supply of voltage to an electrical device in the event a protective element is no longer reliably connected in a circuit arrangement for protecting a susceptible component from inadmissible voltage values. The protective element in the circuit arrangement is often conveniently provided in the form of a suppressor diode, which is connected in parallel with the susceptible component to be protected, and which experiences breakdown in case of excessive voltage, thereby causing a short-circuit in the power supply. In the event of such protective response, the suppressor diode may heat up considerably, and that the solder used for electrical and mechanical attachment may liquefy or evaporate. As a result the suppressor diode may become completely or partially unsoldered, so that a reliable protection of the susceptible component is no longer ensured by the shorting of the circuit thereacross.

Abstract: An apparatus for providing independent over-current protection to a plurality of electrical devices and a transient-voltage suppression system employing the apparatus. In one embodiment, the apparatus includes a non-conductive body having a plurality of bores extending through the body from a first portion to a second portion of the body, a plurality of fusible elements corresponding to and disposed within the plurality of bores, each of the fusible elements having a first terminal proximate to the first portion of the body and a second terminal proximate to the second portion, and a common electrode coupled to the first terminal of each of the plurality of fusible elements. The common electrode is couplable to a source of electrical power and the second terminals of each of the plurality of fusible elements are couplable to an electrical device, such as a metal oxide varistor in a transient-voltage suppression system.

Abstract: A printed circuit board assembly comprising a printed circuit board having a plurality of conductive traces deposited on a surface thereof to define a plurality of electrical circuit geometries. A plurality of thin film fuses are deposited on the printed circuit board, each fuse providing circuit protection to one of the plurality of conductive traces.

Abstract: The electrical apparatus, which is designed in particular as a surge arrestor (3), has a dielectric housing (8) which can be loaded with high voltage as well as an apparatus for optical indication of a fault state caused by a fault current. The indicating apparatus is designed as an information carrier (9) which covers at least a portion of the outer surface of the dielectric housing (8). This information carrier (9) emits an optically detectable signal when heated to a limiting temperature which is above a permissible operating temperature of the apparatus. The information carrier (9) is advantageously designed as a thermocolor. A faulty apparatus can then be identified by the maintenance personnel for a system containing the electrical apparatus, in a simple and reliable manner by means of a color change.

Abstract: A fuse assembly comprising a fuse element and a fuse cavity are formed integrally with the body of a Metal Oxide Varistor (MOV). Melting of the fuse element forms fused material which flows into the fuse cavity. The molten material electrically joins the metalization films on each side of the MOV which causes the MOV to fail shorted before the MOV can overheat and fracture from over voltage caused by excessive transient voltages. The fuse element has the current carrying capability to allow a resultant current to flow which will cause the primary circuit protection device (fuse or circuit breaker) to open. This provides protection against a violent fracture of the MOV and a MOV that can no longer function because it has opened and is undetected.

Abstract: A network interface device (NID) provides an electrical interface between a cable and a local network (e.g., a number of telephones) of a telecommunications system. According to one embodiment of the present invention, high voltage/current electrical isolation is provided by conventional 5-pin plug-in protector that get inserted within the modular NID to form electrical connections, via a printed wiring board, with both cable-side and network-side interfaces. The plug-in protectors are inserted into a bath of gel that gets displaced and surrounds the seams of the protector, forming a water-resistant seal that inhibits moisture from entering the protector and adversely affecting protector operations. As such, NIDs of the present invention can be configured with plug-in protectors for outdoor applications, even though, under conventional NID specifications, plug-in protectors are limited to indoor applications and special potted protectors are required for outdoor use.

Abstract: An overvoltage protection plug is provided, including at least one voltage-limiting component with an associated fuse element and a fail-safe device (6). The fuse element trips the fail-safe device (6) in the event of thermal overheating. The fail-safe device can optionally be upgraded with visual fail-safe signaling, wherein the voltage-limiting component is arranged with the associated fuse element and the fail-safe device (6) as an enclosed unit on a first printed circuit board (3) to which, optionally, the visual fail-safe signaling, which is arranged on a separate, second printed circuit board (10), can be assigned.

Abstract: A novel current-limiting line protector for a communications circuit is disclosed, and includes a first and second incoming conductive member, a one piece roll-formed conductive member conductively coupled to each incoming conductive member, a ground member, an S-shaped spring in slidable contact with the ground member, and a first and second diode and solder member combination conductively coupled to the first and second incoming conductive members and disposed between the spring and the incoming conductive members. Each diode and solder member combination maintains the spring and the respective incoming conductive member in spaced, non-conducting relation while each solder member remains substantially intact.

Abstract: A backup gap type over-voltage protector and thermal protector for a two element gas discharge tube. The gas discharge tube is mounted with its electrodes between opposing fingers of a clip of electrically conductive material. One of the clip fingers contacts the tube electrode that is to be grounded and the other finger is spaced from the other tube electrode that receives the voltage by a piece of thermally meltable, electrically insulating material having at least one hole that is located under the finger. Upon failure of the gas discharge tube, an over-voltage applied to the electrode jumps the gap formed by the hole in the insulating piece back to the clip finger and is conducted to ground. Upon thermal overload of the gas discharge tube, the insulating piece melts and brings the clip finger into contact with the tube electrode receiving the voltage and connects it and the voltage line to ground.

Abstract: A layer of thermal fusible material is placed on one surface of a metal oxide varistor (MOV) to monitor the heating of the MOV due to applied voltage spikes. The thermal fusible material is part of the electrical circuit which includes the MOV and melts at a predetermined temperature. In the presence of a severe or a number of voltage spikes the MOV heats up and the heat transferred to the thermal fusible material causes it to open the electrical circuit to the MOV to prevent overheating and thermal runaway. In another form, the MOV is separated into two halves and the thermal fusible material layer is placed between the ends of the MOV halves.

Abstract: Disclosed is a protector device designed for insertion in connecting blocks. The device includes a ground connector which has a detent on one end for receiving a ground bar from the connecting block. The other end of the connector contacts the ground electrode of a voltage surge protector element when the ground bar is inserted without any forces supplied by the housing.

Abstract: A device for line card lightning and power fault protection includes a heat generating fusible resistive element connected to two electrical terminals using a controlled-melting temperature solder. The resistive element has enough thermal mass to withstand low level overcurrent conditions. The electrical terminal configuration and material are designed to thermally isolate the resistor. A spring tensioning device is included to aid in circuit disconnect when sufficient overcurrent exists to melt the resistor-to-terminal solder. The entire assembly is housed in a high temperature insulating plastic enclosure which permits installation using surface mount technology.

Abstract: A system for registering a malfunction in telecommunications equipment comprises a protective device including a terminal connector pin and a ground pin connected to ground. The system also includes a housing member for housing the protective device, the housing member including a conductive member attached thereto. A main failsafe switch connects the terminal connector pin to ground through the ground pin in the event of an overvoltage, while an alarm switch connects the conductive member attached to the housing member to ground in the event of the overvoltage. An overvoltage sensitive member contacts both the main failsafe switch and the alarm switch, and retracts both the main failsafe switch and the alarm switch while in a normal operating state of the telecommunications equipment. The overvoltage sensitive member releases both switches in the event of the overvoltage.

Abstract: A surge suppressing device includes a voltage-dependent resistor having an opening formed therethrough. A pair of preformed pads formed of an electrically conductive material is located adjacent a first and second side respectively of the voltage-dependent resistor proximate the opening. The electrically conductive material flows through the opening creating an electrical short between the first and second sides when the voltage-dependent resistor is heated in response to excessive leakage current flowing therethrough.

Abstract: An arrester assembly which retains all the components thereof in an assembled condition is disclosed. The arrester assembly can be handled as an individual subassembly for use in a line protector. The arrester assembly includes a cup which has a base, at least one wall, and an open end. A sleeve is retained within the cup by an interference fit between the outside of the sleeve and the inside surface of the cup. An arrester element having a first face and a second face is retained within the sleeve with the first face in conductive contact with the base of the cup. A solder contact in the form of an elongated beam is positioned within the sleeve in abutting contact with the second face of the arrester element. The beam includes engaging structures which are forced past an inner ridge on an internal surface of the sleeve for retaining the beam in position in the sleeve.

Abstract: A building entrance protector which incorporates the functions of a splice tray and a protector module comprising factory wired fusible link circuits which are insulated from all other wiring. Quick connect terminal strips and a protector receptacle block speed installation and maintenance.