Model: W-OP4

The W-OP4 Phase Protection Relay is a digital electronic instrument designed for AC voltage monitoring and protection in 3 phase 4 wire and 3 phase 3 wire system. Used in application such as main failure, phase unbalance, under and over voltage. When the measured voltage moves outside the set-point limit, the relay will de-energize after the time delay, it operates automatically and shut down your motor before any damage is done. The relay will automatically reset to energize when the input voltage is raised past the set-point plus the hysteresis value,

Approved standard :CE Mark
Power consumption :2 VA
Input voltage :220, 440, 460 VAC (Requirement)
380, 400 or 415 VAC 3Ø (Selectable)
System frequency :50/60 Hz.
Accuracy :± 0.5% of normal voltage
Display :7-segment Red LED Letter 0.39” (9.90mm)
Over voltage (OV) :Adjustable from 10% to
20% (Requirement 10-25%)
Under voltage (UV) :Adjustable from 2% to 20% (Requirement 2-25%)
Unbalance voltage (UB) :Adjustable from 2% to 20% (Requirement 2-25%)
Differential (Hysteresis):Preset at 1%
Delay off :UV and UB Adjustable 0-5 sec.
OV preset at 2 sec.
Relay Output 
Output type :2-pole change over (DPDT)
Contact rating :5A at 250VAC
Operations :Mechanical :2 x 107
timesElectrical :1 x 105
Relay reset :Automatic
Operating temperature:-10°C to +55°C
Storage temperature :-10°C to +70°C
Ambient humidity :Max 85%RH
Mounting :DIN rail 35mm
Housing :ABS UL94V-0
Protection class :IP20
Wire fixing :Screw terminal block (3.5mm2
self lifting)
Indicator :LED 3mm
Dimension in mm :55 x 76 x 106
Weight :303 g

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