RS PRO Phase Monitoring Relays RS PRO is proud to present a complete range of phase monitoring relays designed for 3 phase systems. Each monitor relay is packed with excellent features to ensure effective protection against all types of low voltage faults. These compact high-quality monitoring devices offer over-voltage and under-voltage protection, protect against voltage phase sequence, phase loss, and phase asymmetry. Key Features Phase Failure Relays Compatible with 3 or 4 wire application Switchable by a dip switch Selectable supply voltage Adjustable under and over voltage set points Selectable ON/OFF time delays LED Indication Compact housing Compact width: 17.5 mm Multi-Voltage: Three Phase 3 Wire @ 208-480 VAC or Three Phase 4 Wire @ 120-277 VAC Can be configured for 3 Phase 3 Wire or 3 Phase 4 Wire system Protection against Phase loss, Phase Sequence, Phase Asymmetry, Under Voltage & Over Voltage Selectable Under Voltage / Over Voltage, Asymmetry and Phase Sequence LED Indication for all Faults & for change in dip switch settings during runtime for better security Adjustable ON/OFF Time Delay in seconds minutes 1 C/O Configuration Connection for supply voltage and relay is illustrated on the side of the device. 208-480 VAC, UV/OV, Phase Loss, Phase Sequence, Phase Asymmetry Monitoring, 1 C/O = RS stock no: 223-7791 415 VAC (3P, 3W) / 240 VAC (3P, 4W), UV/OV, Phase Loss, Selectable Phase Sequence, Phase Asymmetry, 1C/O = RS stock no: 223-7792 415 VAC (3P, 3W) / 240 VAC (3P, 4W), UV/OV, Selectable Phase Sequence & Phase Asymmetry, ON Delay and OFF Delay (in sec/min), 1C/O = RS stock no: 223-7794 415 VAC (3P, 3W), Phase loss Monitoring, 1 C/O = RS stock no: 223-7795 Switchgear Control Gear Machine Control Mains Distribution Systems