K8DS-PH1

Overview of Omron K8DS-PH1

The Omron K8DS-PH1 is a compact phase-sequence and phase-loss monitoring relay designed for 3-phase 3-wire AC power systems with voltage inputs ranging from 200 to 480 VAC. It provides reliable detection to prevent equipment damage caused by phase loss or incorrect phase sequence. The relay features one SPDT contact output and is mounted on a DIN rail with screw terminals for secure wiring.

Key Features of Omron K8DS-PH1

• Monitors phase sequence and phase loss in 3-phase 3-wire systems
• Input voltage range: 200 to 480 VAC (3-wire)
• Output: One SPDT relay contact (NC operation)
• Rated load: 5 A at 250 VAC or 30 VDC (resistive load)
• Maximum switching capacity: 1,250 VA and 150 W
• Operating time: Phase sequence 0.1 seconds ±0.05 s, phase loss max 0.1 s
• Automatic reset after fault clearance
• Indicators: Green power LED and yellow relay operation LED
• Mounting: DIN rail mount
• Dimensions: 17.5 × 80 × 74 mm (W × D × H)
• Operating temperature: -20 to 60 °C (no icing or condensation)
• Terminal connection: Screw terminals
• Degree of protection: Terminals IP20
• Mechanical life: 10 million operations minimum
• Electrical life: 50,000 operations at 5 A resistive load
• Applicable standards: EN 60947-5-1, UL 508, CSA C22.2 No.14

Technical Specifications

Applications / Use Case

The K8DS-PH1 relay protects three-phase motors and equipment from damage caused by phase loss or incorrect phase sequence, commonly used in industrial motor control panels, pumps, compressors, and HVAC systems. It enhances operational safety and prevents costly equipment failures.