An anti-surge structure built in switches includes three metal-oxide varistors disposed in an insulating body in stair-like arrangement. The metal-oxide varistors further has an insulating band surrounding a middle metal-oxide varistor and defining four isolated insulating areas within the insulating body, so as to avoid high voltage flashover and to protect the structure from external impacts. With the stair-like arrangement, each metal-oxide varistor has a connecting area for both ends of a metal strap to be welded thereon by low-temperature solder paste. When the low-temperature solder paste are melted by heat, a compressed spring element thereof is ejected to displace a pushing element thereof and to further detach two connecting points of the structure, so as to break a circuit connected by the structure.

An anti-surge structure built in switches includes three metal-oxide varistors disposed in an insulating body in stair-like arrangement. The metal-oxide varistors further has an insulating band surrounding a middle metal-oxide varistor and defining four isolated insulating areas within the insulating body, so as to avoid high voltage flashover and to protect the structure from external impacts. With the stair-like arrangement, each metal-oxide varistor has a connecting area for both ends of a metal strap to be welded thereon by low-temperature solder paste. When the low-temperature solder paste are melted by heat, a compressed spring element thereof is ejected to displace a pushing element thereof and to further detach two connecting points of the structure, so as to break a circuit connected by the structure.

An anti-surge structure built in switches includes three metal-oxide varistors disposed in an insulating body in stair-like arrangement. The metal-oxide varistors further has an insulating band surrounding a middle metal-oxide varistor and defining four isolated insulating areas within the insulating body, so as to avoid high voltage flashover and to protect the structure from external impacts. With the stair-like arrangement, each metal-oxide varistor has a connecting area for both ends of a metal strap to be welded thereon by low-temperature solder paste. When the low-temperature solder paste are melted by heat, a compressed spring element thereof is ejected to displace a pushing element thereof and to further detach two connecting points of the structure, so as to break a circuit connected by the structure.

An anti-surge structure built in switches includes three metal-oxide varistors disposed in an insulating body in stair-like arrangement. The metal-oxide varistors further has an insulating band surrounding a middle metal-oxide varistor and defining four isolated insulating areas within the insulating body, so as to avoid high voltage flashover and to protect the structure from external impacts. With the stair-like arrangement, each metal-oxide varistor has a connecting area for both ends of a metal strap to be welded thereon by low-temperature solder paste. When the low-temperature solder paste are melted by heat, a compressed spring element thereof is ejected to displace a pushing element thereof and to further detach two connecting points of the structure, so as to break a circuit connected by the structure.

Exemplary embodiments include a device for connecting and disconnecting a high-voltage circuit. The device includes a first main terminal and a second main terminal, a first intermediate terminal connected to the first main terminal by a first impedance, a first arc quenching chamber arranged between the first intermediate terminal and the first main terminal, a second intermediate terminal connected to the first intermediate terminal by a second impedance, the first intermediate terminal being connected in series between the first main terminal and the second intermediate terminal, a second arc quenching chamber arranged between the first intermediate terminal and the second intermediate terminal, and a mobile armature making it possible to connect, in the disconnection direction, the second main terminal on the one hand and, on the other hand and in succession, the first main terminal, the first intermediate terminal and the second intermediate terminal.

Exemplary embodiments include a device for connecting and disconnecting a high-voltage circuit. The device includes a first main terminal and a second main terminal, a first intermediate terminal connected to the first main terminal by a first impedance, a first arc quenching chamber arranged between the first intermediate terminal and the first main terminal, a second intermediate terminal connected to the first intermediate terminal by a second impedance, the first intermediate terminal being connected in series between the first main terminal and the second intermediate terminal, a second arc quenching chamber arranged between the first intermediate terminal and the second intermediate terminal, and a mobile armature making it possible to connect, in the disconnection direction, the second main terminal on the one hand and, on the other hand and in succession, the first main terminal, the first intermediate terminal and the second intermediate terminal.