Analogue Adjustable Three-Phase Over and Under Voltage Control Relay GK-04F

From the shop's description

Features Voltage control relays are designed to protect devices with sensitive operating voltage from damage caused by mains voltage. Over Voltage : 400V – 460V AC (Adjustable) Under Voltage: 260V – 360V AC (Adjustable) Error Waiting Time : 0,1sec. – 10sec. (Adjustable) Phase Sequence Control Non-Neutral User Guide