Overvoltage protection device

Details Overvoltage protection device Overvoltage protection device

H - Electricity

02

H

317/12.9

H02H 9/04 (2006.01) H02H 3/05 (2006.01) H02H 9/06 (2006.01)

Patent

CA 1200276

OVERVOLTAGE PROTECTION DEVICE Abstract of the Disclosure An overvoltage protection device, for protecting communications equipment against hazardous voltages due to lightning or power surges, comprises a primary protector, for example a gas tube device, and a back-up protector connected in parallel. The back up protector includes a semiconductor pn junction, and is preferably a pair of diodes back-to-back. The back-up protector has a breakdown voltage slightly higher than that of the primary protector and is arranged to fail short-circuit once it has operated so as to provide an indication that the primary protector failed to operate. - i -

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