... , MODBUS-RTU protocol, realize remote communication;4.Four digital inputs to monitor and control the switch state;5 ... phase inputDisplaySingle row four bits LCD/ LED Display Frequency40-60Hz, 0.2 class accuracy Digital Input4 digital inputs ,passive dry contact ... Ω2kv/50Hz/1minOperating ConditionEnvironment Temperature: -10-55°C , No corrosive gas environmentStorage ConditionAmbient Temperature: -20-75 ...