In example implementations, a printhead die is provided. The printhead die includes a substrate, a chamber layer formed on the substrate, a plurality of printing fluid ejection chambers coupled to opposite sides of the chamber layer and along a length of the chamber layer, and a top hat layer formed on the chamber layer and the plurality of printing fluid ejection chambers. The chamber layer includes a void to store printing fluid. The top hat layer includes an initial unsupported top hat layer portion over the void, wherein the initial unsupported top hat layer portion comprises a first end that is narrower than a second end.

A probe card device includes a wiring board provided with a plurality of contacts, a probe head having a probe holder and a plurality of conductive probes arranged on the probe holder, respectively, and a circuit protection assembly including an insulation plate, a plurality of through holes and a plurality of self-resetting fusing elements. The insulation plate is sandwiched between the wiring board and the probe head. The through holes are respectively formed on the insulation plate and arranged in an array form. The self-resetting fusing elements are respectively disposed within the through holes. Each of the self-resetting fusing elements is electrically connected to one of the contacts and one of the conductive probes for reversibly breaking down electric currents from the wiring board to the conductive probe.

A power supply control device is to be installed in a vehicle. The power supply control device controls power supply via a semiconductor switch and a fuse by turning the semiconductor switch ON or OFF. The semiconductor switch and the fuse are mounted on a circuit board. In the fuse, two long plate-shaped terminals are arranged in a row. The fusing portion and a part of the two terminals are covered with a housing having heat resistance. The two terminals are disposed in a current path of a current flowing through the semiconductor switch. The current flows through the fusing portion. If the temperature of the fusing portion exceeds a predetermined temperature, the fusing portion is fused.

It is aimed to provide a fuse element capable of interrupting an electrical circuit while suppressing the formation of carbide when an abnormal current is generated. A fuse element 10 is provided with an insulating base material 3 and a conductor layer 1 provided on a surface of the base material 3. The conductor layer 1 is physically ruptured at a temperature lower than a temperature, at which the conductor layer 1 is fused and cut, when the conductor layer 1 is energized and generates heat.

A wire harness includes: a flexible printed circuit board; a chip fuse mounted on the flexible printed circuit board; a plate member having a flat plate-shaped plate body having a frame shape, and a cylindrical peripheral wall protruding from the plate body in a thickness direction of the plate body; and a potting agent, in which the plate body is fixed to the flexible printed circuit board so as to surround the chip fuse by the peripheral wall, and the potting agent is charged in a space portion surrounded by the peripheral wall and covers the chip fuse.

An overvoltage protection apparatus with failure protection is provided. The overvoltage protection apparatus may include a first set of one or more overvoltage protection components connected between a powered line and a return line, a thermal switch in thermal communication with the first set of one or more overvoltage protection components, and an electromechanical switch coupled to the thermal switch. The electromechanical switch may be configured to trigger a circuit breaker for the powered line when actuated. When the thermal switch is exposed to a temperature corresponding to the heat generated by the at least one overvoltage protection component and the temperature exceeds a threshold temperature, the thermal switch may actuate the electromechanical switch to create a short circuit such that the short circuit triggers the circuit breaker to interrupt power supplied by the powered line.