A redundant fault protection architecture for a DC electrical system with a hybrid relay sensing current on a DC rail as primary protection, and a pyrofuse, either self-triggering or externally triggered, as secondary protection. The pyrofuse is set to trigger after a delay to enable the hybrid relay to clear the fault (overcurrent). If the hybrid relay fails to clear the fault within a certain time duration, the pyrofuse subsequently is triggered and clears the fault.

The invention relates to a protection ensemble, comprising a circuit breaker, and a surge protector device, wherein the circuit breaker and the surge protector device have an interface, wherein the surge protector device comprises a monitoring device and, upon recognizing a fault condition by the monitoring device, the circuit breaker can be tripped by means of the interface.

The invention relates to a protection ensemble, comprising a circuit breaker, and a surge protector device, wherein the circuit breaker and the surge protector device have an interface, wherein the surge protector device comprises a monitoring device and, upon recognizing a fault condition by the monitoring device, the circuit breaker can be tripped by means of the interface.

Various embodiments include a fuse electrically connecting two connection regions comprising: a heat sink; a set of layers arranged on a surface of the heat sink, the set of layers including an electrically insulating layer arranged on the heat sink and an electrically conductive conductor layer arranged on a side of the insulation layer facing away from the heat sink; and an electrical connecting path between the connection regions. The surface of the heat sink defines two material cutouts. A portion of the heat sink arranged between the material cutouts forms a bridge element. The set of layers is disposed on the bridge element.

A fuse board including a metal plate, a connection portion connected to a cell, a fuse portion connecting the metal plate to the connection portion, and an insulating resin film bonded to the fuse portion, wherein a wiring pattern of the fuse portion has a bent portion, and the insulating resin film has a rectangular sheet-like shape that covers one surface of the fuse portion.

A fuse board including a metal plate, a connection portion connected to a cell, a fuse portion connecting the metal plate to the connection portion, and an insulating resin film bonded to the fuse portion, wherein a wiring pattern of the fuse portion has a bent portion, and the insulating resin film has a rectangular sheet-like shape that covers one surface of the fuse portion.

A method of making printed circuit board vias using a double drilling and plating method is disclosed. A first hole is drilled in a core, the first hole having a first diameter. The first hole is filled and/or plated with an electrically conductive material. A circuit pattern may be formed on one or two conductive layers of the core. A multilayer structure may then be formed including a plurality of cores that also include pre-drilled and plated via holes, wherein at least some of the pre-drilled and plated via holes are aligned with the first hole. A second hole is then drilled within the first hole and the aligned pre-drilled and plated holes, the second hole having a second diameter where the second diameter is smaller than the first diameter. A conductive material is then plated to an inner surface of the second hole.

A subsea-replaceable fuse assembly has at least one fuse and a wet-mateable fuse connector element. The connector element is arranged to connect the fuse assembly to a subsea electrical load requiring protection of the fuse. The fuse connector element has conductor elements that are electrically connected to the fuse. A corresponding method of protecting a subsea electrical load includes connecting a fuse to the load underwater in a wet-mating operation effected between connector elements that are electrically connected, respectively, to the fuse and to the load.

Provided is a fuse device used for high rating and high current applications excellent in impact resistance at the time of current interruption, and capable of preventing falling off of the case. The fuse device includes: a base member; a cover member fitted to the base member and covering a surface of the base member; and a fuse element mounted on the surface of the base member; wherein one of the base member and the cover member is provided with a side wall intersecting with the plane of the surface of the base member and including an opening formed therein, and the other of the base member and the cover member is provided with a fitting projection projecting outward from a plane intersecting with the plane of the surface of the base member and fitted into the opening of the side wall.

The disclosed concept relates generally to overlay composite fuse elements, materials for their construction that include copper and silver metals, and methods of production and fabrication using metal stamping and ultrasonic welding processes. In certain embodiments, a composite overlay fuse element includes a composite metal material 37 constructed of silver and copper metals, which includes a plurality of strain absorbing bend features 39 constructed of copper metal, and a plurality of arc interrupting weak spot features 43 constructed of a silver metal portion and a copper metal portion. The silver and copper metal portions on each of the plurality of arc interrupting weak spot features 43 are connected by a weld joint surface 45 that is structured to form an overlay of the silver and copper metal portions.