... Dry contact, Lightning protection, Electrostatic protection, Over current protection), 3-Phase AC Power Opto isolated inputs to detect the Electricity A, B, C ... 3 phase status. It allows you to monitor and control ... 3,CS 4.Size: 20mm*31mm*70mm (LXWXH)Net Weight: 2.50KgSkype: AsiaGSMalarm GPRS Outdoor Alarm Controller S250,Three-Phase Power ...