Three-phase voltage, asymmetry, and phase-sequence phase-loss relay

Protect motors and other equipment from unstable voltages in the power supply system. Detect overvoltages, undervoltages, voltage asymmetry, phase sequence, and phase loss for three-phase power supplies.

  • Phase loss detection while the motor is operating
  • Widely applies 3-phase 3-wire system (Changed with a DIP switch)
  • Greater resistance to inverter noise
  • Width of 17.5 mm to reduce space required in panels
  • Push-in plus Technology that reduce wiring work
  • UL listed for easy shipping to North America
  • Double-insertion holes for crossover wiring (all terminals)
  • Models added with transistor outputs for superior contact reliability
  • RoHS compliant
Specifications & ordering info

Ordering information

Rated input voltage1

Relay output

Order code

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

Relay: SPDT contact output


Transistor: Open collector


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

Relay: SPDT contact output


Transistor: Open collector


Note: The input range is set with a rotary switch.


Front Cover (Order separately)


Order code







Rated input voltage

Three-phase, three-wire Mode: 200, 220, 230, or 240 VAC

Three-phase, three-wire Mode: 380, 400, 415, or 480 VAC

Input load

Approx. 1.7 VA

Approx. 2.7 VA

Operating value setting range

2% to 30% of rated input voltage

5% to 22% of rated input voltage

The rated input voltage can be switched by using the DIP switches.

Operating value

Operates at 100% of set value.

Asymmetry operating value = Rated input voltage × Asymmetry set value (%)

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

Reset value

2% of operating value (fixed)

Reset method

Automatic reset

Operating time setting range

Overvoltage/ Undervoltage

0.1 to 30 s


0.1 to 30 s

Phase sequence

0.1 s±0.05 s

Phase loss

0.1 s max.

Power ON lock time (LOCK)

1 s/5 s (switched by using the DIP switch)


Power (PWR): Green, Output (OUT): Yellow, Alarm outputs (ALM): Red

Output form

Relay: SPDT contact output

Transistor: Open collector

Output relay ratings

Resistive load

5 A at 250 VAC
5 A at 30 VDC

Inductive load

1 A at 250 VAC
0.2 A at 48 VDC

Minimum load

5 VDC, 10 mA (reference values)

Mechanical life

10 million operations min.

Electrical life

5 A at 250 VAC or 30 VDC: 50,000 operations

3 A at 250 VAC or 30 VDC: 100,000 operations

Transistor output ratings

Contact form

SPST-NO (Open collector)

Rated voltage

24 VDC (maximum voltage: 26.4 VDC)

Maximum current

50 mA DC

Ambient operating temperature

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

Storage temperature

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

Case material

PC, UL 94 V-0


Approx. 100 g

Size in mm (H × W × D)


Input frequency

50/60 Hz

Overload capacity

Continuous 528 V

Repeat accuracy

Operating value

±0.5% full scale (at 25°C and 65% humidity, rated power supply voltage)

Operating time

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

Applicable standards

Conforming standards

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


EN 60947-5-1

Safety standards

UL 60947-5-1 (Listing), Korean Radio Waves Act (Act 10564), CCC (GB 14048.5), LR (Category ENV1.2)2

Degree of protection

Terminals: IP20

1. The power supply voltage is the same as the rated input voltage.

2. Certification is pending for LR.

1. The power supply voltage is the same as the rated input voltage.

2. Certification is pending for LR.

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