Function:

42

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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.

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.

Frequency Sensitive Relays

PRODUCT SPECIFICATIONS

Sample Part No.

25-050X

Type:

25 - Over/Underfrequency

Frequency Range

Under

Over

050 =

40-50 Hz

50-60 Hz

060 =

50- 60 Hz

60-70Hz

400 =

350- 400 Hz

400-450Hz

Mounting Options

X = Flange

blank = Stud

Consult factory for additional models.

PART NUMBER SELECTION

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.

PART NUMBER SELECTION

Part Number

Input Voltage (

±10%) ......................

Frequency Range (adjustable) ........

Trip Points ........................................

Temperature Range .........................

Temperature Drift .............................

Voltage Drift .....................................

Contact Ratings ................................

Output Contacts ...............................

25-000 Series

120 VAC

See Part Number Selection

Screwdriver adjustable

± 1% frequency error over temperature range

± 1% frequency error input voltage variation of ± 10%

5 Amp resistive at 120 VAC or 28VDC

One set N.O., One set N.C.

11

4 MTG. HOLES

#6 - 32 STUDS

6 PLACES

2

3

3

81 O/U

WILMAR™ Protective Relays – 25-000 Series