Frequency Sensitive Relays
WILMAR™ Protective Relays – 25-000 Series
Function:
81 O/U
•
ANSI/IEEE C37.90-1978
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 above the preset frequency. The pick-up and
drop-out frequency settings are independently ad-
justable.
4
1
/
2
3
13
/
16
#6 - 32 STUDS
6 PLACES
Operation:
The normally open contacts close, and the normally
closed contacts open, at nominal frequency. The
contacts are de-energize at underfrequency,
overfrequency or no input voltage.
3.0
2
3
/
4
1
/
2
Note:
Dimensions in inches. Multiply values by 25.4 for dimensions in mm.
3
1
/
2
Part Number
Input Voltage (±10%)
......................
120 VAC
Frequency Range (adjustable) ........ See Part Number Selection
Trip Points ........................................ Screwdriver adjustable
Temperature Range ......................... -20
o
C to +85
o
C
Temperature Drift .............................
±
1% frequency error over temperature range
Voltage Drift .....................................
±
1% frequency error input voltage variation of
±
10%
Contact Ratings ................................ 5 Amp resistive at 120 VAC or 28VDC
Output Contacts ............................... One set N.O., One set N.C.
Notes:
1.
The contacts are shown in the de-energized position.
2.
Remove screws for access to the underfrequency and overfrequency trip adjustments.
3.
Clockwise rotation of the adjustment potentiometer will raise the frequency trip points.
3
7
/
8
3
PART NUMBER SELECTION
/ DIA.
4 MTG. HOLES
11 64
"
PRODUCT SPECIFICATIONS
PART NUMBER SELECTION
Sample Part No.
25-050X
Type:
25 - Over/Underfrequency
Frequency Range
Under
050 =
40-50 Hz
060 =
50- 60 Hz
400 =
350- 400 Hz
Mounting Options
X = Flange
blank = Stud
Consult factory for additional models.
25-000 Series
Over
50-60 Hz
60-70Hz
400-450Hz
42
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)
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