The Omron K8DS-PH1 is a DIN-rail-mounted monitoring relay that detects 3-phase phase sequence errors and phase loss conditions. Operating across a wide voltage range of 200–480V AC (50/60Hz), this device helps protect motors and equipment from rotation errors and phase imbalance by triggering an output relay when faults are detected. A compact, reliable solution for industrial automation panels.

Brand: Omron
Model: K8DS-PH1
Type: Phase Sequence & Loss Monitoring Relay
Input Voltage Range: 200–480V AC (L1/L2/L3)
Frequency: 50/60 Hz
Power Consumption: 2.7 VA
Output Relay: SPDT (1 changeover contact)
Output Rating: 5 A at 250V AC / 30V DC
Response Time:

• Phase loss: 0.1–1s

• Phase sequence: ~0.1s
  Indicators: LED status indicators for Power, Phase Status, and Output Relay
  Mounting Type: DIN rail (35 mm standard rail)
  Terminals: Screw-type terminals
  Enclosure Rating: IP20 (housing), IP40 (front panel)
  Certifications: CE, UL, CSA, TÜV, EAC
  Standards Compliance: EN60947-5-1
  Dimensions: 22.5 mm (W) × 100 mm (H) × 90 mm (D)
  Made in: China (Omron Japan OEM)
  Applications:

• Phase monitoring for 3-phase motors

• Motor protection in control panels

• Industrial automation, HVAC, conveyors, pumps

The K8DS-PH1 ensures proper motor rotation and electrical safety, providing critical protection in systems where phase sequence and presence are vital to reliable operation.

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