Frequency Sensitive Relays
WILMAR™ Protective Relays – 20-000 Series
Function:
81 O
The output contacts of frequency relays are ener-
gized when the frequency exceeds the adjustable set
point. Overfrequency and underfrequency relays are
available in 50, 60 and 400Hz. Combination over/
underfrequency “band pass” relays are also avail-
able. These are energized at rated frequency and de-
energized during overfrequency or underfrequency
conditions. Frequency Differential relays are ener-
gized between the preset frequencies. The pick-up
and drop-out frequency settings are independently
adjustable.
4 1/2
#6 - 32 STUDS
6 PLACES
Operation:
The normally open contacts close, and the normally
closed contacts open, at all frequencies above the set
point. The contacts in the connection diagram, are
shown in the de-energized position (below the trip
set point).
3 13/16
Note:
Dimensions in inches. Multiply values by 25.4 for dimensions in mm.
Part Number
Input Voltage (±10%)
......................
120 VAC, Single Phase
Frequencies Range (adjustable) ...... See Part Number Selection
Differential ........................................ Frequency pick-up to drop-out differential is 1% max
Temperature Range ......................... -40
o
C to +85
o
C
Temperature Drift .............................
±
1% frequency error over temperature range
Voltage Error ....................................
±
1% for input voltage of 120 VAC
±
10%
Contact Ratings ................................ 5 amp resistive at 120 VAC or 28 VDC
Output Contacts ............................... One set N.O., one set N.C.
Notes:
1.
Remove screw for access to trip adjustment.
Tyco Electronics
/ www.tycoelectronics.com / Factory Direct Technical Support: 800-253-4560, ext. 2023 (U.S., Canada, Mexico) or 805-220-2020, ext. 2023 (International)
3.0
1 /2
3
7 /8
3
2
3/4
1/2
3
PART NUMBER SELECTION
11 /64" DIA.
4 MTG. HOLES
120VAC
PRODUCT SPECIFICATIONS
PART NUMBER SELECTION
Sample Part No.
Type:
20 - Frequency
Frequency Range
040 = 40-50 Hz
050 = 50-60 Hz
060 = 60-70 Hz
350 = 350-500 Hz
400 = 400-450 Hz
Mounting Options
X = Flange
blank = Stud
20-050X
20-000 Series
Consult factory for additional models.
41
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