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Omron K8DS-PH1 3 Phase Monitoring Relay

Omron K8DS-PH1 3 Phase Monitoring Relay

3-pahse, 3-wire 200 to 480 VAC, SPDT



• Lineup includes a 17.5-mm slim, compact model.

• Greater resistance to inverter noise.

• Distinguishes between correct phases, phase sequence, and phase loss when power is turned ON.

• Supports phase loss detection when the motor is operating.

• Output status can be monitored using LED indicator.

• Ideal to prevent reverse operation of motors.



Input voltage range 200 to 480 VAC
Input frequency 50/60 Hz (no presumed range)
Overload capacity Continuous 500 V
Phase loss detection level 80%±10% of rated input
Calculation Formula
= 1 - ((Highest phase-to-phase voltage - Lowest phase-to-phase voltage)/
Average three-phase phase-to-phase voltage)
Conforming standards EN 60947-5-1
Installation environment (pollution level 2, installation category III)
EMC EN 60947-5-1
Safety standards UL 508 (Recognition), Korean Radio Waves Act (Act 10564),
CSA: C22.2 No.14, CCC: GB/T 14048.5
Insulation resistance 20 MΩ min.
Between external terminals and case
Between input terminals and output terminals
Dielectric strength 2,000 VAC for one minute
Between external terminals and case
Between input terminals and output terminals
Noise immunity 1,500 V power supply terminal common/normal mode
Square-wave noise of ±1 μs/100 ns pulse width with 1-ns rise time
Vibration resistance Frequency: 10 to 55 Hz, 0.35-mm single amplitude
10 sweeps of 5 min each in X,Y, and Z directions
Shock resistance 100 m/s2, 3 times each in 6 directions along 3 axes
Degree of protection Terminals: IP20
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