Provided is an improved overvoltage protection element. The overvoltage protection devices comprises at least one ESD protection couple comprising discharge electrodes in a plane, a gap insulator between the discharge electrodes, an overvoltage protection element parallel to the planar discharge electrodes wherein the overvoltage protection element comprises a conductor and an secondary material. The overvoltage protection element also comprises a primary insulator layer between the discharge electrodes and overvoltage protection element.

A voltage dependent resistor includes a ceramic body and an electrically conductive structure for external connection. The ceramic body has two opposite surfaces and a side surface connecting the two opposite surfaces, and at least one of the two opposite surfaces is formed with at least one protrusion at a position adjacent to the side surface. As the protrusion makes the opposite surfaces of the ceramic body non-planar, the voltage dependent resistor is capable of suppressing the occurrence of flashover firelight during surge impact, so that its capability of withstanding surge impact is enhanced and its lifespan is prolonged. In addition, such structural arrangement is capable of preventing ceramic plates from adhering with each other when they are stacked with each other during the sintering stage of a green compact, thereby simplifying the post-processing procedures and minimizing the defect rate.

The invention relates to an overvoltage protection device with varistors, wherein a first varistor and a second varistor are connected in series, wherein the first varistor has a thermal disconnector, wherein the first varistor has a lower operating voltage than the second varistor, and wherein the first varistor has a lower energy absorption capacity than the second varistor, with the first varistor heating up more in the event of an overload and thereby causing the thermal disconnector to disconnect.

Devices for protecting a plurality of conductors against a power surge. One device includes a first electrode positioned on a first surface of the device, a second electrode positioned on the first surface of the device, and a floating electrode positioned on a second surface of the device. The first electrode is configured to receive a surge current from a first conductor. The surge current travels through the device from the first electrode to the floating electrode and from the floating electrode to the second electrode

An overvoltage protection device module includes an electrically conductive first electrode, an electrically conductive housing electrode, and a varistor member formed of a varistor material and electrically connected between the first electrode and the housing electrode. The housing electrode includes a housing end wall and a housing side wall collectively defining a housing cavity, and first and second housing members joined together at a joint. The first housing member forms a first portion of the housing side wall and the second housing member forms a second portion of the housing side wall. The varistor member is disposed in the housing cavity.

Embodiments of the disclosure provide an electrical power surge arresting apparatus. Specifically, the surge arresting apparatus may be implemented within a port of an electrical power cord. In some embodiments, the surge arresting power cable comprises a plurality of conductive plates that may be attached to the hot, neutral, and ground leads of the electrical power cord. A plurality of Metal Oxide Varistors (MOV) may be positioned between the plurality of conductive plates. The plurality of conductive plates may be directly coupled to or comprise a plurality of conductive clips that may be configured to directly couple to a surge protected electronic device. Accordingly, there are no leads between the surge protecting device and the surge protected electronic device. The surge arresting device may further comprise one or more capacitors serving as a low-pass filter.

A monitoring arrangement for electrical equipment includes a first sensor for sensing a surface creeping current on a creeping path-lengthening electrically insulating housing of the equipment. A monitoring system includes electrical equipment, the monitoring arrangement, a communication device for transmitting data to a central server device, and a central server device configured to receive and evaluate the data.

A surge protective device (SPD) module includes a printed circuit board (PCB), a first electrode, a second electrode, and a varistor electrically connected between the first and second electrodes. The SPD module forms a housing assembly defining a chamber containing the varistor. The PCB forms a portion of the housing assembly.

A device for dissipating a surge includes at least three metal oxide varistors (MOVs). Each of the MOVs may be positioned adjacent to each other. Each of the MOVs may have two contact surfaces. Contact surfaces of adjacent MOVs are electrically connected together. The at least three MOVs include a first outer MOV, a second outer MOV, and at least one inner MOV positioned between the first outer MOV and the second outer MOV. The first outer MOV and the second outer MOV have a greater voltage at a given current than at least one of the at least one inner MOV. The device further includes a first connector electrically coupled to at least one of the at least three MOVs. The device further includes a second connector electrically coupled to at least another of the at least three MOVs.

The present invention relates to an electrostatic discharge protection device containing a first insulating substrate and a second insulating substrate; a first opposing electrode and a second opposing electrode which two are disposed between the first insulating substrate and the second insulating substrate; external electrodes connected to the first opposing electrode and the second opposing electrode; and a discharge inducing section disposed apart from the front end of the first opposing electrode and the front end of the second opposing electrode.