Abstract: A head-worn device comprises a housing with an insulating housing wall and is housing a conducting element (24; 31) having at least one end embedded into the housing wall, and a component (22; 30) being arranged adjacent to the conducting element (24; 31). The component (22; 30) and the conducting element (24; 31) are being separated by a partitioning element (26; 28; 40) provided as an insulator. The partitioning element (26; 28; 40) is having a shape increasing the travelling distance for a spark between the conducting element (24; 31) and the component (22; 30) by at least 40%, and a thickness and a Dielectric Strength sufficient to resist 3 kV without breaking down.

Abstract: A protection element wherein variations in fusing characteristics are improved by making the amount of a flux applied on a fusible conductor uniform. The protection element includes: an insulating substrate; a heating element laminated on the insulating substrate and covered with an insulating member; first and second electrodes, formed at both ends of the insulating substrate; an internal heating-element electrode laminated on the insulating member so as to be superposed above the heating element; and a fusible conductor whose ends are connected to the first and second electrodes, and center portion of which is connected to the internal heating-element electrode. To both ends of the heating element, there are connected heating element electrodes to connect a power supply to generate heat by passing electric current through the heating element. In the fusible conductor, a depression portion opened upward is formed at a position to be superposed above the heating element.

Abstract: A circuit protection device includes a conductive layer which is connected to first and second terminals. A spring is electrically connected to the first and second terminals. When an over-voltage or over-temperature condition occurs within a charging circuit, one or more heat generating resistive elements melts material associated with one or more of the ends of the spring thereby releasing the spring to create an open circuit.

Abstract: Disclosed is a fuse resistor representing superior manufacturing efficiency and assembling reliability. The fuse resistor includes a resistor, a thermal fuse that is disconnected by heat generated from the resistor, and a case receiving the resistor and the thermal fuse therein and having a space section for transferring radiant heat of the resistor to the thermal fuse. Fillers are not required so that the manufacturing process is simplified. Since the assembling process is completed by covering a body of the case with a cap after the resistor and the thermal fuse have been inserted into the body, the manufacturing efficiency is improved.

Abstract: A MOV includes a MOV body, a first lead, a thermal cut-off fuse, a second lead and a silver electrode area. The MOV of the present invention employs the silver electrode area formed on and electrically coupled to the MOV body, thus the MOV has a lower inductance, which accordingly, enables the MOV to have a high and sound thermal conductivity. Hence, the MOV can fleetly and perfectly transfer heat to the thermal cut-off fuse in case of over-voltages, thus enabling the thermal cut-off fuse to cut off the power more quickly.

Abstract: A secondary battery of the present invention a heat-sensitive element which varies in resistance value due to change of temperature is not placed on a path through which a charge or discharge current flows into or out of a storage battery. Accordingly, when a main switch element generates heat due to an overcurrent, a change in resistance value of the heat-sensitive element resulting from the heat will allow an auxiliary switch to be turned ON, thereby causing first and second auxiliary fuses to be blown. The charge or discharge current causes no power consumption at the heat-sensitive element, thereby providing high efficiency. The heat-sensitive element can be reduced in current capacity for use and it is suitable for compact design.

Abstract: A dual element fuse includes a first conductive fuse coupler portion and an overload fusing assembly coupled to the first conductive fuse coupler portion. The overload fusing assembly includes a barrel having a flange at one end thereof, a trigger received within said barrel and positioned in a pre-operated position by a fusing alloy, and a conductive coil surrounding the barrel predominately in an area adjacent the flange. The conductive coil is connected between the first conductive fuse coupler portion and the flange, thereby concentrating heat generated in the conductive coil toward the flange.

Abstract: A fuse apparatus (1) is provided for selectively interrupting a load current (Ia) flowing between a pair of associated conductor leads. The fuse apparatus includes at least two spaced apart electrically conductive contact elements (5) operatively connected with the associated conductor leads. A fuse element (7) is connected to the contact elements (5) using an electrically conductive connection material (9) to allow the current (Ia) to flow between the pair of associated conductor leads. The connection material (9) is adapted to electrically disconnect the fuse element (7) from the contact elements (5) when the current (Ia) exceeds a predetermined current intensity. The connection material (9) has an intrinsic electrical transition resistance characteristic whereby the material develops a temperature in proportion to an intensity of the current. The connection material melts as the current increases to separate the fuse element from the contact elements.

Abstract: Circuit protection device having a PTC element in series with a fusible element. The device includes a PTC element having first and second electrodes in electrical contact with the PTC element. An insulating layer is disposed on the first and second electrodes. Portions of the insulating layer are removed to form first and second contact points. A first conductive layer is in electrical contact with the first electrode and wraps around the PTC element. A portion of the first conductive layer forms a fusible element. A second conductive layer is in electrical contact with the second electrode. The wrap-around configuration of the device allows for an electrical connection to be made to both electrodes from the same side of the electrical device. The wrap-around configuration also permits current to flow in series through the PTC element and the fusible element for added protection from overcurrent conditions.

Abstract: In a positive temperature coefficient thermistor, a terminal holding member is provided between an outer casing and an elastic terminal electrically connected to the semiconductor ceramic element. The terminal holding member is formed of a thermoplastic resin having a low softening point. Consequently, when an abnormally large amount of heat is generated in the semiconductor ceramic element, the terminal holding member melts and deforms, causing the semiconductor ceramic element to be separated and thereby electrically disconnected from the terminal.

Abstract: Electrical devices with a PTC element including a polymer having conductive particles dispersed therein and at least one metallized ceramic electrode. The devices are made by dispersing conductive particles into a polymer to form a polymer PTC composition. The metallized ceramic electrodes include a ceramic substrate having a conductive layer deposited on its surface. The metallized ceramic electrodes are brought into contact with the PTC element, and heated while applying pressure to form a laminate. The laminate is then diced into a plurality of PTC electrical circuit protection devices.

Abstract: A surge protector includes a housing having therein a wire wound resistor and a fuse separated by a partition wall. In one embodiment for use with high density information transmission, the resistor is of very low value and preferably is 5.6 ohms. The leads from the resistor and fuse are glued in position. The resistor wire is wound about a mandrel and is widely spaced to prevent arcing between adjacent coils of the resistor. A high temperature coating covers the resistor coils and mandrel effectively immobilizing the coils from movement in response to a magnetic field generated when high voltage is applied to the resistor. A cover closes the housing and conceals the components. The housing is empty of potting material.

Abstract: A back-up safety device is shown for use with a power controller to prevent damage to circuits with which the controller is used in the event that the controller malfunctions. The safety device has performance characteristics which conforms to selected circuit breaker time-current curves so that it does not interfere with normal operation of the controller. The safety device is surface mountable on the same substrate on which the controller is disposed.