The low voltage series surge protective device, (SPD) is a two-pair (four wire) module implementing three-stage hybrid technology. It is ideally suited for low voltage signal line protection in industrial environments. This SPD addresses overvoltage transients with gas tubes and silicon avalanche diodes. In addition, overcurrents are mitigated with self resettable PTC fuses which increase resistance several orders of magnitude when overcurrents are above normal levels.
