1
3 /2
3.0
7
3 /8
4 /2
1
Frequency Sensitive Relays
Function:
WILMAR Protective Relays 20-000 Series 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.
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).
PART NUMBER SELECTION
11
/64" DIA.
4 MTG. HOLES
Note: Dimensions in inches. Multiply values by 25.4 for dimensions in mm.
120VAC
PRODUCT SPECIFICATIONS
PART NUMBER SELECTION
Part Number 20-000 Series
Sample Part No. 20-050X
Type:
Input Voltage (10%) ......................
120 VAC, Single Phase
20 - Frequency
Frequencies Range (adjustable) ...... See Part Number Selection
Frequency Range
040 = 40-50 Hz
Differential ........................................ Frequency pick-up to drop-out differential is 1% max
050 = 50-60 Hz
o o
Temperature Range .........................
-40 C to +85 C
060 = 60-70 Hz
350 = 350-500 Hz
Temperature Drift ............................. 1% frequency error over temperature range
400 = 400-450 Hz
Voltage Error .................................... 1% for input voltage of 120 VAC 10%
Mounting Options
X = Flange
Contact Ratings ................................
5 amp resistive at 120 VAC or 28 VDC
blank = Stud
Output Contacts ............................... One set N.O., one set N.C.
Consult factory for additional models.
Notes:
1. Remove screw for access to trip adjustment.
41
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)
#6 - 32 STUDS
6 PLACES
13
3 /16
3
2 /4
1
3 /2