This relay from OMRON monitors voltage asymmetry, phase sequence and phase loss for 3-phase 3-wire or 4-wire power supplies, in one unit.

• Worldwide power specifications
• Phase sequence, phase loss: operation reaction time 0.1s maximum
• Asymmetry: operation time setting from 0.1 to 30s
• Reset method: automatic
• Power ON lock: 1s or 5s

3-phase asymmetry, phase-sequence, phase-loss relay