Voltage Sensitive Relays
Function:
WILMAR™ Protective Relays – WUVT/WOVT Series
27/59
• ANSI/IEEE C37.90-1978
• UL file No. E58048
• CSA file No. LR61158
TERMINAL STRIPS
#6 - 32 SCREWS
Undervoltage Models - The relay is energized at
normal voltage, N.C. contacts will open and N.O.
contacts will close. The relay will de-energize when
the voltage drops and remains below the U/V set
point for the duration of the set time delay.
3.0
Overvoltage Models - The relay is de-energized at
normal voltages, N.C. contacts are closed and N.O.
contacts are open. The relay will energize, when the
voltage rises and remains above the O/V set point for
the duration of the set time delay.
Single Phase
Three Phase
13
/
64
"
DIA.
PART NUMBER SELECTION
4 MTG. HOLES
Sample Part No.
Type:
WUVT-1-120
Note: Dimensions in inches. Multiply values by 25.4 for dimensions in mm.
WUVT - Undervoltage
WOVT- Overvoltage
No. Phases
PRODUCT SPECIFICATIONS
Part Number
WUVT/WOVT
1 = Single
3 = Three (line to line)
Line Voltage VAC
Nominal Voltage ...............................
Phase ................................................
Line Frequency .................................
Pick-up to Drop-out Differential ......
Drop-out Point (u/v models) ...........
Pick-Up Point (o/v models) .............
Output Contacts ...............................
Contact Ratings ................................
Operating Temperature Range ........
Power Consumption ........................
Time Delay ........................................
Voltage Reset ...................................
100 VAC to 575 VAC
Single or Three
100
115
240
380
416
440
460
480
525
575
50-400 Hz
120
1% typical
150
200
70-100% of nominal voltage, screwdriver adjustable
100-125% of nominal voltage, screwdriver adjustable
One set N.O, One set N.C.
208
220
230
Options:
5 amp resistive at 120 VAC or 28 VDC
-40°C to +70°C
Blank - Standard
A = 2 Form A Contacts
B = 2 Form B Contacts
H = 125VDC 3A Contacts
P = Transient Protection
3 VA maximum
0.5 to 20 seconds, screwdriver adjustable
The reset is automatic when voltage returns to normal.
Transient Protection - All voltage relays will withstand
momentary voltage surges of twice the nominal rated
input voltage (standard).
Notes:
1. Remove black screws for access to the voltage and time delay adjustment potentiometer.
2. Clockwise rotation of the voltage adjust potentiometer will raise the voltage trip point.
3. Clockwise rotation of the time adjust potentiometer will increase the time delay (Pick-up
time for O/V models, drop-out time for U/V models).
4. The adjustments are single turn potentiometers, use a small screwdriver and do not force
beyond the limit stops.
Option "P" provides additional transient protection
which complies with the requirements of ANSI/IEEE
C37.90-1978
5. On U/V models, when the voltage falls to approximately 33% of nominal or below, the relay
will drop out in 0.150 to 0 .300 seconds, regardless of the time delay setting.
Consult factory for additional models.
2 1
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