Frequency Sensitive Relays
WILMAR™ Protective Relays – 20-050-19 Series (Voltage/Frequency)
Function:
27/81
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ANSI/IEEE C37.90-1978
#6 - 32 STUDS
6 PLACES
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UL file No. E58048
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CSA file No. LR61158
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
Note:
Dimensions in inches. Multiply values by 25.4 for dimensions in mm.
Part Number
Nominal Voltage (±20%)
.................
120 VAC, Single Phase
Nonimal Frequency .......................... 60 Hz.
Voltage Adjustment Range (PU) ..... 85 to 120 VAC
Frequency Adjustment Range (PU) . 45 to 60 Hz
Output Contacts ............................... One set N.O., one set N.C.
Contact Ratings ................................ 5 amp resistive at 120 VAC or 28 VDC
Notes:
1.
Remove black screws for access to the voltage and frequency and the time adjustments.
2.
Clockwise rotation of the voltage adjustment potentiometer will raise the voltage trip point.
3.
Clockwise rotation of the frequency adjustment will raise the frequency time point.
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
2
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3
2
3 /4
1 /2
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PART NUMBER SELECTION
11 /64" DIA.
4 MTG. HOLES
PRODUCT SPECIFICATIONS
PART NUMBER SELECTION
Sample Part No.20-050-19X
Type:
20-050-19 = Voltage/Frequency
Mounting Options
Blank = stud
X = Flange
Options:
P = Surge Suppression
20-050-19 Series
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