Slim-line three-phase voltage, asymmetry and phase-sequence phase-loss protection

K8DS-PZ monitors undervoltages, overvoltages, voltage asymmetry, phase sequence and phase loss for 3-phases, 3-wire monitoring in one unit.

  • Worldwide power specifications supported by one unit
  • Front rotary switches allow for easy and accurate configuration
  • Reset method: automatic
  • LED indicators: Power (Green), Relay output (Yellow), Alarm output (Red)
  • Robust operating temperature: -20 to 60 ⁰C

  • 17.5 mm (w) body
  • Greater resistance to inverter noise
  • World-wide power specifications supported by one unit

Specifications & ordering info

Ordering information

Rated input

Order code

3-phase 3-wire mode

200, 220, 230, 240 VAC


3-phase 3-wire mode

380, 400, 415, 480 VAC



Ambient operating temperature

-20 to 60°C (with no condensation or icing)

Storage temperature

-25 to 65°C (with no condensation or icing)


2,000 m max.

Input frequency

50/60 Hz (AC power supply)

Output relays
(1 × SPDT, normally closed operation)

Resistive load

5 A at 250 VAC or at 30 VDC

Maximum contact voltage

250 VAC or 30 VDC

Maximum contact current

5 A

Maximum switching capacity

1,250 VA, 150 W

Mechanical life

10,000,000 operations

Electrical life

50,000 operations at 5 A, 250 VAC

Degree of protection

Terminal section: IP20

Case material

PC UL94 V-0


Approx. 65 g

Rated input voltage


3-phase, 3-wire mode: 200, 220, 230, 240 VAC


3-phase, 3-wire mode: 380, 400, 415, 480 VAC

Operation (overvoltage or undervoltage)

Operating value setting range

Overvoltage/undervoltage: 2% to 30% of rated input voltage

Operating value

100% operation at set value

Asymmetry operation (ASY.)

Operating value setting range

Asymmetry rate: 5% to 22%

Operating value

100% operation at set value

Asymmetry operating value = rated input voltage x asymmetry set value [%]

The asymmetry operation will function when the difference between the highest and lowest voltage phases equals or exceeds the asymmetry operating value

Reset (HYS.)


5% of operating value (fixed)

Resetting method

Automatic reset

Operating time (T)


0.1 to 30 s


0.1 to 30 s

Phase-sequence, phase-loss

0.1 s ±0.05 s, 0.1 s max.

Power ON lock (LOCK)

1 s ±0.5 s

Overload capacity

Continuous input: 500 V

Repeat accuracy

Operating value

±0.5% full scale (at 25°C and an ambient humidity of 65% at the rated power supply voltage, 50/60 Hz sine wave input)

Operating time

±50 ms (at 25°C and 65% humidity, rated power supply voltage)


Power (PWR): Green, Relay output (RY): Yellow LED, Alarm output: Red LED

Applicable standards

Conforming standards

EN 60947-5-1
Installation environment (pollution level 2, installation category III)


EN 60947-5-1

Safety standards

UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: C22.2 No.14

Size in mm (H × W × D)

80 × 17.5 × 74

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