GPRS Outdoor Alarm Controller S250; Three-Phase Power Line Protection; NC/NO/EOL Dry Contact; Remote Relay ... Dry contact, Lightning protection, Electrostatic protection, Over current protection), 3-Phase AC Power Opto isolated inputs to detect the Electricity A ... Net Weight: 2.50KgSkype: AsiaGSMalarm GPRS Outdoor Alarm Controller S250,Three-Phase Power Line Protection,NC/NO/EOL Dry Contact,Remote Relay ...