An electric cut-off safety device for the power circuits of an electric bipolar vehicle is capable of cutting off two poles. An electric vehicle can include such an electric cut-off safety device.

The invention relates to a fuse holder comprising two housing elements which, once assembled, together form a tube in which a fuse is accommodated. The first housing element includes a base extending longitudinally along the direction of assembly of the two housing elements with each other. A seal is placed on the base mainly in a plane perpendicular to the direction of assembly. During assembly, the second housing element is brought to at least partially cover the base to sandwich the seal between the two housing elements. A rim extends around the base in the direction of assembly in order to protect the seal until the two housing elements are assembled together.

A fusible link includes a power supply portion provided on a connection terminal that connects to a battery terminal, a circuit terminal that connects to a circuit, a power-supply side upstanding portion standing in an out-of-plane direction of a terminal mounting surface from an edge substantially parallel to an extending direction of the battery terminal out of an outer circumferential edge near the power supply portion of the connection terminal, a circuit-side upstanding portion standing in the same direction as the power-supply side upstanding portion from an edge substantially parallel to the extending direction out of an outer circumferential edge of the circuit terminal, and a bridge portion extending between the power-supply side upstanding portion and the circuit-side upstanding portion. The power-supply side upstanding portion, the circuit-side upstanding portion, and the bridge portion function as a fuse element that fuses when a current greater than a threshold value flows.

Device for protecting an electrical circuit fed by an alternating current, comprising a housing and a fuse element disposed in the housing. The housing comprises a first portion and a second portion which are mobile in relation to one another, and elastic means suitable for causing the first portion to bear against the second portion and causing the housing to be set in a closed state.

The invention relates to a fuse holder comprising two housing elements which, once assembled, together form a tube in which a support for a fuse is accommodated. Each of the two housing elements comprises a contact for establishing an electrical contact with a terminal of a fuse housed in the support, when the support is installed between the assembled housing elements. The support may comprise means to ensure the correct position of each contact in its respective housing element. The support may also comprise means to ensure the correct orientation of the fuse in the support. The support may also comprise means for retaining a seal ensuring sealing between the two housing elements.

A short-circuit shutdown switch is disclosed having a load current path and a cutting plunger. The load current path has a separating member with a first predetermined cutting zone, a second predetermined cutting zone, and a central section positioned between the first predetermined cutting zone and the second predetermined cutting zone. The cutting plunger is positioned to cut the first predetermined cutting zone and the second predetermined cutting zone.

A hold-down release apparatus includes a housing, a reciprocating retention member, a release member, bias member(s), and a fuse wire. The retention member moves between retention and release positions and is biased toward the release position. With the retention member in the release position, the release member can move out of the housing; with the retention member in the retention position, the retention member obstructs the release member from moving out of the housing. The fuse wire obstructs movement of the retention member to the release position and holds the retention member in the retention position against the bias force. With an actuation current flowing through the fuse wire, the bias force breaks the fuse wire, allowing the retention member to move to the release position in response to the bias force, and the release member to move out of the housing.

A fuse element (10) includes a low-melting-point metal layer (11), a high-melting-point metal layer (12) laminated on at least one surface of the low-melting-point metal layer (11), and an intermediate layer (13) disposed between the low-melting-point metal layer (11) and the high-melting-point metal layer (12), in which the high-melting-point metal layer (12) and the intermediate layer (13) are layers formed of a metal which is melted by a molten material of the low-melting-point metal layer (11), and the intermediate layer (13) has a higher ionization tendency than an ionization tendency of the high-melting-point metal layer (12).

The invention relates to a triggered fuse for low-voltage applications for protecting devices that can be connected to a power supply system, in particular surge protection devices, consisting of at least one fusible conductor which is located between two contacts and is arranged in a housing, and also consisting of a trigger device for controlled disconnection of the fusible conductor in the event of malfunctions or overload states of the respective connected device, wherein an arc quenching medium is introduced into the housing. By way of example, an arc quenching medium-free region is formed in the housing such that the at least one fusible conductor is exposed, and a mechanical disconnection element can be introduced into the arc quenching medium-free region via an access point in the housing in order to mechanically destroy the at least one fusible conductor depending on the trigger device, and independently of its melting integral.

A protection device comprises a substrate, a fusible element and a heating element. The substrate comprises a first electrode and a second electrode on its surface. The fusible element is disposed on the substrate and connects to the first electrode and the second electrode at two ends. The fusible element comprises a first metal layer and a second metal layer disposed on the first metal layer. The second metal layer has a lower melting point than that of the first metal layer. The heating element is disposed on the substrate. In the event of over-voltage or over-temperature, the heating element heats up to melt and blow the fusible element. The second metal layer is 40-95% of the fusible element in thickness.