Citel

Compagnie Industrielle De Tubes Et Lampes Electriques Citel

Michel Cantagrel

Overvoltage-protection device, applicable in particular to the low-voltage mains, comprising, between the two lines ( ) of the mains, a gas-discharge arrestor ( ), a varistor ( ) and a thermal-fuse element ( ) task with ensuring the thermal disconnection of the device . It includes, in parallel with the varistor ( ), a resistor ( ) causing, after the short-circuiting of the gas-discharge arrestor ( ), the heating of the thermal-fuse element ( ) so as to trigger the thermal disconnection of the device.

Overvoltage-protection device

The device relates to a gas lightning arrester comprising a tight enclosure and at least two electrodes (2a, 2b). In the enclosure is placed a powdery mineral addition agent. This addition agent is a mixture of elementary or mixed metal oxides globally corresponding to the general formula Al X.sub.a Y.sub.b O.sub.c, in which formula X and Y respectively represent at least one alkaline or alkaline-earth metal, a is between 0.02 and 1.5, b is between 0 and 0.25 and c has the necessary value to comply with the valency rules. Can be used for the protection of the telephone lines.

Growing community of inventors

Houilles, France

Michel Cantagrel