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 energized 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 available. These are energized at rated frequency and deenergized during overfrequency or underfrequency conditions. Frequency Differential relays are energized above the preset frequency. The pick-up and drop-out frequency settings are independently adjustable. #6 - 32 STUDS 6 PLACES 4 1/ 2 3 13/16 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. 37 1 /2 3.0 3 /8 2 3 /4 1 /2 3 PART NUMBER SELECTION 11 / 64" DIA. 4 MTG. HOLES Note: Dimensions in inches. Multiply values by 25.4 for dimensions in mm. PRODUCT SPECIFICATIONS Part Number 25-000 Series Input Voltage (±10%) ...................... 120 VAC Frequency Range (adjustable) ........ See Part Number Selection Trip Points ........................................ Screwdriver adjustable Temperature Range ......................... -20oC to +85oC Temperature Drift ............................. ± 1% frequency error over temperature range Voltage Drift ..................................... ± 1% frequency error input voltage variation of ± 10% 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 Over 50-60 Hz 60-70Hz 400-450Hz Contact Ratings ................................ 5 Amp resistive at 120 VAC or 28VDC Output Contacts ............................... One set N.O., One set N.C. Consult factory for additional models. 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. 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)