A surge arrester is described, comprising a first and a second electric terminals (1, 2) for connection to live and guard/neutral conductors of an electric system, between which a protection member (3) is connected, provided with a voltage electrode and with a protective electrode equipped with respective electrical connectors (1a, 3a) electrically connected to said electric terminals (1, 2), a disconnector electrically arranged between said protection member (3) and said second electric terminal (2) comprising a metal lamina (4) failing in the presence of short-circuit currents exceeding a preset threshold, said failing generating plasma, and an intercepting slider (6), mounted elastically biased and sliding in a sliding and guiding chamber crossed by said lamina (4), displacement of said interception slider (6) being prevented by said lamina (4) and being allowed by the failing of said lamina (4), and further comprising an arc extinguishing chamber (CI) provided with a divergent duct (10) and a respective inlet portion (10a) defined by end portions of a pair of divergent conductors (11a, 11b), wherein said inlet portion (10a) is arranged in fluidic communication with said sliding and guiding chamber and has an opening facing a pressure wave front generated by said displacement of the interception slider (6) acting as a plunger.

A switch module with a built-in structure of anti-surge and dual disconnection mainly comprises an overcurrent protection switch having plates and insulating elements for anti-surge and dual disconnection structure ingeniously built inside a heat-resisting housing. The switch module has a first connecting point and a second connecting point for operation. When overvoltage occurs, temperature of at least one metal oxide varistor would instantly rise up to a degree higher than the melting point thereof, melting at least one thermo-sensitive piece, loosening at least one spring element, displacing a pushing element and thus forcing the connecting points detaching from each other to turn off the switch and stop supplying electricity power; meanwhile, insulating elements would isolate conductive components such as thermo-sensitive pieces, spring elements and plates to further ensure a complete disconnection and more of electricity safety.

Disclosed is an SMD micro mixed fuse with a thermal fuse function that stably operates at high voltage surges and can interrupt electrical current at a predetermined temperature. The SMD micro mixed fuse includes: a fuse substrate provided with a first electrode and a second electrode; a variator layer formed on a front surface of the fuse substrate; a first contact terminal and a second contact terminal respectively arranged at a first side and a second side of a front surface of the varistor layer and respectively connected to the first electrode and the second electrode; at least one thermal fuse that is arranged on the front surface of the variator layer, is not connected to the first and second contact terminals, but is connected to the fuse substrate; and a fusible element that is wire-bonded to the first and second contact terminals and is not connected to the thermal fuse.

A high-voltage direct-current thermal fuse, includes a high-voltage low-current thermal fuse connected to a high-voltage direct-current circuit. The high-voltage low-current thermal fuse includes a casing, fusible alloy wires, and two leads extending out of the casing. The fusible alloy wires are connected between the two leads. One of the leads is sequentially sleeved with an arc extinguishing sleeve and a spring. One end of the arc extinguishing sleeve is in contact with the fusible alloy wires; and the other end of the arc extinguishing sleeve is in contact with the spring. One end of the spring is connected to the internal end face of the casing; and the spring is in a compressed state. The high-voltage direct-current thermal fuse further includes a conventional thermal fuse connected in parallel to the high-voltage low-current thermal fuse; or further includes a current fuse connected in series with the high-voltage low-current thermal fuse.

A surge absorber module includes a conductive bracket with an end fixed to a main body and electrically connected to a pin, and the other end electrically connected to a surge absorbing member through a hot melt member, and an elastic member with an end elastically abutting the main body and the other end elastically abutting the conductive bracket. The conductive bracket is elastically abutted by the elastic member to move horizontally in an accommodating space and disconnect the electrically connected surge absorbing member.

A fire protection device for small electrical devices provided with a housing. The fire protection device includes a bursting capsule featuring a hollow space that is completely enclosed and delimited by a vessel wall, wherein a liquid is disposed in the hollow space. The liquid breaks the vessel wall at a predetermined trigger temperature due to thermal expansion thereby causing the bursting capsule to rupture. When the vessel wall ruptures and releases the liquid it has a fire preventing effect and/or a fire extinguishing effect.

Disclosed is a fuse resistor provided on an electrical circuit to protect the electrical circuit and elements. The fuse resistor includes a substrate on which first and second resistive terminals and fuse terminals are formed, first and second resistive elements surface-mounted on the first and second resistive terminals and dividing applied current or voltage, and a temperature fuse surface-mounted on the fuse terminals and broken by heat generated from the first and second resistive elements. If overcurrent or overvoltage is applied, the first and second resistive elements generate heat and the temperature fuse is broken by the generated heat.

A device for protecting an electrical installation including an insulating body electrically defining an internal housing, the protective device including, within the internal housing: an active component of a device for protecting an electrical installation; a disconnection system for disconnecting the active component moveable between a contact position corresponding to a connected state of the active component and an open position corresponding to a disconnected state of the active component; a disconnection indicator, where the disconnection indicator is secured in movement to the disconnection system and the disconnection indicator and the insulating body are arranged to have a first configuration, which corresponds to the contact position, and a second configuration, which corresponds to the open position, the relative positioning of the disconnection indicator with respect to the insulating body in the first configuration being visually distinct from the outside of the insulating body from the relative positioning of the disconnection indicator with respect to the insulating body in the second configuration.

A fire protection device for small electrical devices provided with a housing. The fire protection device includes a bursting capsule featuring a hollow space that is completely enclosed and delimited by a vessel wall, wherein a liquid is disposed in the hollow space. The liquid breaks the vessel wall at a predetermined trigger temperature due to thermal expansion thereby causing the bursting capsule to rupture. When the vessel wall ruptures and releases the liquid it has a fire preventing effect and/or a fire extinguishing effect.

A disconnection device for electrically disconnecting an electrical appliance from an electrode pair having an electrically isolating holder between the electrode pair. The holder has an electrically conductive substance disconnectable from the electrode pair under gravity forces.