Voltage Sensitive Relays
WILMAR™ Protective Relays – 250 Series, Over/Undervoltage
Function:
27/59
•
ANSI/IEEE C37.90-1978
The 250 series relays provide combined Overvolt-
age and Undervoltage protection in a single
compact unit.
6 -32 STUDS (6)
Models are available for single phase or three
phase applications, and are suitable for either 50
Hz, 60 Hz, or 400 Hz operation. The trip point is
adjustable.
A transistorized circuit provides a sharp and
accurate response at the preset tripping voltage;
unaffected by temperature or frequency variations.
2
Single
Phase
Note:
Dimensions in inches. Multiply values by 25.4 for dimensions in mm.
Part Number
Nominal Voltage ...............................
Undervoltage Trip ............................
Overvoltage Trip ...............................
Pick-Up to Drop-Out Differential .....
Contact Ratings ................................
Contact Form ....................................
Operating Temperature Range ........
Notes:
1. Remove screws for access the overvoltage or undervoltage trip adjustments. Clockwise rotation
of the adjustment potentiometer will raise the trip 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)
3.5
00
3
7
/
8
3
B.C
.
.
B.C
50
2.7
00
3.5
/ DIA.
4 MTG. HOLES
13 64
"
Three
Phase
Contact Arrangements
NC - Open at nominal voltage. Closed at
Overvoltage and Undervoltage
N O - Closed at nominal voltage. Open at
Overvoltage and Undervoltage
PRODUCT SPECIFICATIONS
PART NUMBER SELECTION
Sample Part No.
250X
250 Series
See Part Number Selection
70-100% of nominal voltage, screwdriver adjustable
100-125% of nominal voltage, screwdriver adjustable
3% maximum
5 amp resistive at 120 VAC or 28 VDC
One set N.O., one set N.C.
-20°C to +85°C
Model: L-L Volts
250X = 120 VAC, 1 Phase, 50-400 Hz
251X = 120/208 VAC, 3 Phase, 4 Wire, 50-400 Hz
252X = 115 VAC, 3 Phase, 3 Wire, 50-400 Hz
253X* = 230 VAC, 3 Phase, 3 Wire, 50-400 Hz
254X* = 380 VAC, 3 Phase, 3 Wire, 50-400 Hz
255X*= 460 VAC, 3 Phase, 3 Wire, 50-400 Hz
256X* = 575 VAC, 3 Phase, 3 Wire, 50-400 Hz
Mounting
Blank = Stud
X = Flange
*
Enclosure heigth is 3.835"
Consult factory for additional models.
25
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