The invention relates to a device for interrupting an electrical current circuit, more particularly a device of this kind that can safely perform a disconnection in a current range up to 100 kA. The device comprises a pyrotechnic switch (PTS) and a safety fuse, wherein the PTS and the safety fuse are connected in series and wherein the PTS can be actively triggered. The PTS is preferably triggered as a result of a current flowing in the current circuit only if the current measured in the current circuit has exceeded a particular value for a particular period of time (filtering time of the PTS).

A high breaking capacity chip fuse including a bottom insulative layer, a first intermediate insulative layer, a second intermediate insulative layer, and a top insulative layer disposed in a stacked arrangement in the aforementioned order, a fusible element disposed between the first and second intermediate insulative layers and extending between electrically conductive first and second terminals at opposing longitudinal ends of the bottom insulative layer, the first intermediate insulative layer, the second intermediate insulative layer, and the top insulative layer, wherein the first and second intermediate insulative layers are formed of porous ceramic.

Disclosed is a circuit protection device including a case, a negative temperature coefficient thermistor which is accommodated in the case and includes a resistant heating element, a pair of electrodes installed on both sides of the resistant heating element, and a first lead wire and a second lead wire withdrawn from the pair of electrodes, respectively, and a thermal fuse which is accommodated in the case and includes a thermal fuse body and a third lead wire and a fourth lead wire connected to both ends of the thermal fuse body, respectively. Here, the second lead wire and the third lead wire are connected to each other in the case.

A power fuse for protecting an electrical load subject to transient load current cycling events in a direct current electrical power system is provided. The power fuse includes at least one fuse element assembly that includes an elongated planar substrate, a plurality of fusible weak spots, and a conductor. The weak spots are formed on the substrate and are longitudinally spaced from one another on the substrate. The conductor is separately provided from the substrate and the weak spots. The conductor includes a solid elongated strip of metal having no stamped weak spot openings therein and therefore avoiding thermal-mechanical fatigue strain in the conductor when subjected to the transient load current cycling events. The solid elongated strip of metal includes coplanar connector sections that are mounted to respective ones of the weak spots and obliquely extending sections bent out of plane of the connector sections to extend above the substrate.

A surface-mount type micro fuse has a fusible element provided in a housing. The fusible element has a fusible body and two intermediary portions connected to both ends of the fusing portion. Two gaps are formed respectively between the fusible body and the intermediary portions. When the fusible element is blown out due to the transient abnormal current, the gaps between the intermediary portions cause a large distance instantaneously to prevent the arc. Then effectively ensure the safety of the use of the overall circuit.

A surface-mount type micro fuse has a fusible element provided in a housing. The fusible element has a fusible body and two intermediary portions connected to both ends of the fusing portion. Two gaps are formed respectively between the fusible body and the intermediary portions. When the fusible element is blown out due to the transient abnormal current, the gaps between the intermediary portions cause a large distance instantaneously to prevent the arc. Then effectively ensure the safety of the use of the overall circuit.

A solderless surface mount fuse including a base having a floor and a plurality of adjoining sidewalls defining a cavity, a fuse element including a separation portion spanning between two electrode portions, the separation portion and the electrode portions formed of a contiguous piece of material, the separation portion suspended within the cavity below top edges of the sidewalls of the base, and a cap having a ceiling and a plurality of adjoining sidewalls, the cap fitting over the base and the fuse element with bottom edges of the sidewalls of the cap disposed below the top edges of the sidewalls of the base, wherein the cavity of the base contains a fuse filler that completely surrounds the separation portion.

A solderless surface mount fuse including a base having a floor and a plurality of adjoining sidewalls defining a cavity, a fuse element including a separation portion spanning between two electrode portions, the separation portion and the electrode portions formed of a contiguous piece of material, the separation portion suspended within the cavity below top edges of the sidewalls of the base, and a cap having a ceiling and a plurality of adjoining sidewalls, the cap fitting over the base and the fuse element with bottom edges of the sidewalls of the cap disposed below the top edges of the sidewalls of the base, wherein the cavity of the base contains a fuse filler that completely surrounds the separation portion.

An example interruption switch includes a casing surrounding a contact unit, defining a current path through the switch, which has two connection contacts, a separation region and a sabot. A current supplied to the contact unit may be interrupted via the one of the connection contacts and discharged via the other connection contact. At least one chamber in the switch, delimited by the separation region, is substantially filled with a vaporizable medium in contact with the separation region. The separation region is separable into at least two parts through the supplied current when a threshold amperage is exceeded. An electric arc forming between the two parts at least partially vaporizes the vaporizable medium, and a gas pressure to which the sabot is exposed forms. The sabot moves, in the casing, from a starting to an end position, achieving an insulation spacing between the connection contacts.

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.