GPRS Outdoor Alarm Controller S250; Three-Phase Power Line Protection; NC/NO/EOL Dry Contact; Remote Relay Output. Remote ... ,10A), 8 digital inputs (Dry contact, Lightning protection, Electrostatic protection, Over current protection), 3-Phase AC Power Opto isolated inputs to ... AsiaGSMalarm GPRS Outdoor Alarm Controller S250,Three-Phase Power Line Protection,NC/NO/EOL Dry Contact,Remote Relay Output