Abstract: A modular surge protector includes a shell, a discharge tube unit, a first varistor unit and a second varistor unit, where the discharge tube unit, the first varistor unit and the second varistor unit are arranged in the shell. The first varistor unit and the second varistor unit are stacked, the discharge tube unit is provided at a same side of each of the first varistor unit and the second varistor unit, a first electrode is led out from the first varistor unit, a second electrode is led out from the second varistor unit, and a third electrode is led out from the discharge tube unit. Three frames are provided for the discharge tubes and the varistors to form the modular design. With the vertical discharge tubes and the horizontal varistors, the modular surge protector has a compact structure and meets the requirements of miniaturization applications.

Abstract: A modular surge protection device (SPD) is provided. The modular SPD includes an overvoltage protection component, and a trip mechanism for disconnecting the SPD, where the overvoltage protection component is provided with a pin electrode; the overvoltage protection component includes a voltage switching element; and the trip mechanism is provided on the voltage switching element. The SPD can ensure no action of the trip mechanism in response to a surge in a high-temperature environment, and does not affect the action time of the trip mechanism in response to an abnormal overcurrent.

Abstract: A box core module, a plug module, and a surge protective device (SPD) are provided. The plug module includes a housing, bottom plates, a plurality of box core modules with an independent tripping mechanism, a first pin electrode, and a second pin electrode. The plurality of box core modules are vertically arranged on a side of the bottom plates in a side-by-side or opposite manner, and the plurality of box core modules are connected by an internal connection electrode to form a series and/or parallel combined line. The combined line is led out through the first pin electrode and the second pin electrode. The plug module is combined with a base. A modularized multi-form assembly-type SPD is provided. Mutual conversion between a high working voltage of the SPD and a large lightning strike through-current is achieved when the same voltage-limiting element is used and an overall tripping mode remains unchanged.

Abstract: A surge protector with an anti-off structure includes a pluggable module and a base. The base includes external terminal connection parts on both sides. The top of the external terminal connection part of the base is provided with a sliding limit device. Both sides of the pluggable module are provided with limit protruding blocks. The sliding limit device includes a hole cover, and the hole cover is slidably connected to the top of the external terminal connection part. When the pluggable module is completely inserted, a part of the hole cover protrudes into the pluggable module installation slot and is clamped with a fixing limit device of the pluggable module to limit the pluggable module from being detached from the base. When the pluggable module is removed, the hole cover is moved toward both sides, such that the hole cover is separated from the fixing limit device.

Abstract: A surge protection device with a high breaking capacity includes a housing with at least two lead-out electrodes, and a voltage limiting device and a thermal tripping mechanism that are installed in the housing. The voltage limiting device includes a voltage limiter, a first electrode and a second electrode that are positioned and installed in an insulating cover. The thermal tripping mechanism includes a fixed assembly, a movable assembly and a thermal trigger device. The fixed assembly and the movable assembly form a plurality of displacement switches arranged in series. The thermal trigger device is disposed in linkage with the movable assembly and includes a metal trigger sheet, a fusible alloy and an energy storage member. One end of the metal trigger sheet is fixed on the movable assembly, and the other end of the metal trigger sheet is fixed on the second electrode through welding by the fusible alloy.

Abstract: A high-voltage direct-current thermal fuse includes one or more fusible components each having two fusible alloy support arms, a fluxing agent, a fusing cavity, two pins, and an insulation block. Two fusible alloy support arms are arranged opposite, and the fusible component is U-shaped. The fusible component and the fluxing agent are sealed within the fusing cavity. The two pins are respectively connected to the two fusible alloy support arms. The insulation block is arranged between the two fusible alloy support arms and separates the two pins. A volume ratio of the fluxing agent to the fusing cavity is approximately 50% or less, preferably, 10%-50%. The number of the one or more fusible components is at least two, and the at least two fusible components are arranged separately. The thermal fuse can avoid the burst and quickly cut off the current, which provides effective thermal protection for a circuit.

Abstract: A high-voltage fusing apparatus includes a current fuse, a temperature fuse, and a current-carrying fuse. The current fuse is connected in series with the temperature fuse, and a series branch of the current fuse and the temperature fuse is connected in parallel with the current-carrying fuse. A resistance value of the current-carrying fuse is less than a resistance value of the current fuse, and a fusing temperature of the current-carrying fuse is lower than a fusing temperature of the temperature fuse. The high-voltage fusing apparatus can cut off a high-voltage circuit quickly, and effectively protect the high-voltage heating circuit from overheating.

Abstract: A thermal cutoff includes a first fusible element, a second fusible element, and a closed cavity bounded by a housing having an open end, a cover plate, and a sealant. The two ends of the first fusible element and the two ends of the second fusible element are connected in parallel to a first electrode and a second electrode, respectively. The first fusible element and the second fusible element are provided in the closed cavity. A direction extending from a closed end to the open end of the housing is defined as a vertical direction. The first fusible element and the second fusible element are vertically arranged. The thermal cutoff has a vertical configuration and thus in its entirety has an elongated shape to meet corresponding application requirements.

Abstract: A thermal cutoff at least includes a current-carrying fusible element having two ends connected to a first electrode and a second electrode. The current-carrying fusible element is provided in a closed cavity bounded by a housing having an opening at one end, a cover plate, and a sealant. The thermal cutoff further includes a first lead wire and a second lead wire each wrapped by an insulating sheath. One end of the first lead wire and one end of the second lead wire are electrically connected to the first electrode and the second electrode. The sealant is filled in the opening of the housing, covers an electrical joint between the first lead wire and a first electrode plate and an end of the first lead wire, and also covers an electrical joint between a second electrode plate and the second lead wire and an end of the second lead wire.

Abstract: A surge protection device with a high breaking capacity includes a housing with at least two lead-out electrodes, and a voltage limiting device and a thermal tripping mechanism that are installed in the housing. The voltage limiting device includes a voltage limiter, a first electrode and a second electrode that are positioned and installed in an insulating cover. The thermal tripping mechanism includes a fixed assembly, a movable assembly and a thermal trigger device. The fixed assembly and the movable assembly form a plurality of displacement switches arranged in series. The thermal trigger device is disposed in linkage with the movable assembly and includes a metal trigger sheet, a fusible alloy and an energy storage member. One end of the metal trigger sheet is fixed on the movable assembly, and the other end of the metal trigger sheet is fixed on the second electrode through welding by the fusible alloy.

Abstract: A high-voltage fusing apparatus includes a current fuse, a temperature fuse, and a current-carrying fuse. The current fuse is connected in series with the temperature fuse, and a series branch of the current fuse and the temperature fuse is connected in parallel with the current-carrying fuse. A resistance value of the current-carrying fuse is less than a resistance value of the current fuse, and a fusing temperature of the current-carrying fuse is lower than a fusing temperature of the temperature fuse. The high-voltage fusing apparatus can cut off a high-voltage circuit quickly, and effectively protect the high-voltage heating circuit from overheating.

Abstract: A thermal cutoff includes a first fusible element, a second fusible element, and a closed cavity bounded by a housing having an open end, a cover plate, and a sealant. The two ends of the first fusible element and the two ends of the second fusible element are connected in parallel to a first electrode and a second electrode, respectively. The first fusible element and the second fusible element are provided in the closed cavity. A direction extending from a closed end to the open end of the housing is defined as a vertical direction. The first fusible element and the second fusible element are vertically arranged. The thermal cutoff has a vertical configuration and thus in its entirety has an elongated shape to meet corresponding application requirements.

Abstract: A thermal cutoff at least includes a current-carrying fusible element having two ends connected to a first electrode and a second electrode. The current-carrying fusible element is provided in a closed cavity bounded by a housing having an opening at one end, a cover plate, and a sealant. The thermal cutoff further includes a first lead wire and a second lead wire each wrapped by an insulating sheath. One end of the first lead wire and one end of the second lead wire are electrically connected to the first electrode and the second electrode. The sealant is filled in the opening of the housing, covers an electrical joint between the first lead wire and a first electrode plate and an end of the first lead wire, and also covers an electrical joint between a second electrode plate and the second lead wire and an end of the second lead wire.

Abstract: A thermally protected metal-oxide varistor is provided, including a disconnecting unit, a first varistor assembly and a second varistor assembly. The first varistor assembly and the second varistor assembly are connected in series through a low-melting-point alloy layer; wherein when the low-melting-point alloy layer is fused, the disconnecting unit acts to cut off the low-melting-point alloy. The two varistors are connected directly through solder joints without any transition connection member. The heat transfer path is reduced to the shortest path, and a faster response is realized compared to conventional products formed by a varistor and a disconnecting unit when abnormal over-current passes. Moreover, the slider functions as a physical separator capable of isolating the two varistors after the solder joints are fused, which further diminishes the risk of fire occurrence caused by the failure of instantly blocking current by the disconnecting unit when the varistor breaks down by over-current.

Abstract: A surge protection device includes: an impedance device, a voltage-limiting surge protector, and a switching surge protector. The impedance device is connected in parallel with the voltage-limiting surge protector. A parallel branch of the impedance device and the voltage-limiting surge protector is connected in series with the switching surge protector to form a discharge channel of a lightning impulse current. A series branch of the impedance device and the switching surge protector forms a discharge channel of a follow current. The surge protection device and system of the present invention can effectively improve the capability to withstand multiple pulses and prevent failure of arc-quenching.

Abstract: A high-voltage direct-current thermal fuse includes one or more fusible components each having two fusible alloy support arms, a fluxing agent, a fusing cavity, two pins, and an insulation block. Two fusible alloy support arms are arranged opposite, and the fusible component is U-shaped. The fusible component and the fluxing agent are sealed within the fusing cavity. The two pins are respectively connected to the two fusible alloy support arms. The insulation block is arranged between the two fusible alloy support arms and separates the two pins. A volume ratio of the fluxing agent to the fusing cavity is approximately 50% or less, preferably, 10%-50%. The number of the one or more fusible components is at least two, and the at least two fusible components are arranged separately. The thermal fuse can avoid the burst and quickly cut off the current, which provides effective thermal protection for a circuit.

Abstract: A high-voltage direct-current thermal fuse including: a fusible component having two fusible alloy support arms parallel to each other; a fluxing agent; a fusing cavity; and two pins. The fusible component and the fluxing agent are sealed within the fusing cavity. The two pins are respectively connected to the two support arms. Technically, the fluxing agent only needs to have contact with the fusible alloy. Practically, the fluxing agent is usually coated over the fusible alloy. The fusible component in the high-voltage direct-current thermal fuse of the present application is a U-shaped structure having two parallel support arms. A high electric field intensity is generated when an arc is being cut off, as a result, the electrons repel each other, and the arc is lengthened, thereby increasing the speed of cutting off the arc.

Abstract: A thermally protected varistor includes a varistor chip, a temperature fuse, and a lead line, wherein the varistor chip includes a first conductive layer and a second conductive layer, and the lead line includes a first lead line, a second lead line, and a third lead line. One end of the first lead line is connected to the first conductive layer, and the other end of the first lead line is led out. A first end of the temperature fuse is led out as the second lead line, and a second end of the temperature fuse is connected to the second conductive layer. One end of the third lead line is connected to the second conductive layer, and the other end of the third lead line is led out. The temperature fuse is an axial temperature fuse and is tightly attached to the varistor chip.

Abstract: A high-voltage fuse includes a temperature fuse device and a high-voltage breaking device that are connected in parallel, wherein the high-voltage breaking device includes a fuse link, and the fuse link is an n-shaped structure with parallel segments at both ends thereof; and a resistance value of the temperature fuse device is lower than a resistance value of the fuse link, and a melting point of the temperature fuse device is lower than a melting point of the fuse link. The high-voltage fuse can realize an over-temperature fusing function. Due to the n-shaped fuse link, the electric arc may be cut off quickly to perform high-voltage breaking and protect the safety of the circuitry.

Abstract: A thermally protected metal-oxide varistor is provided, including a disconnecting unit, a first varistor assembly and a second varistor assembly. The first varistor assembly and the second varistor assembly are connected in series through a low-melting-point alloy layer; wherein when the low-melting-point alloy layer is fused, the disconnecting unit acts to cut off the low-melting-point alloy. The two varistors are connected directly through solder joints without any transition connection member. The heat transfer path is reduced to the shortest path, and a faster response is realized compared to conventional products formed by a varistor and a disconnecting unit when abnormal over-current passes. Moreover, the slider functions as a physical separator capable of isolating the two varistors after the solder joints are fused, which further diminishes the risk of fire occurrence caused by the failure of instantly blocking current by the disconnecting unit when the varistor breaks down by over-current.