3.500 B.C. 7 3 /8 3 Voltage Sensitive Relays Function: WILMAR Protective Relays 250 Series, Over/Undervoltage 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. Single Phase Three Phase Note: Dimensions in inches. Multiply values by 25.4 for dimensions in mm. Contact Arrangements NC - Open at nominal voltage. Closed at Overvoltage and Undervoltage NO - Closed at nominal voltage. Open at Overvoltage and Undervoltage PRODUCT SPECIFICATIONS PART NUMBER SELECTION Sample Part No. 250X Part Number 250 Series Nominal Voltage ............................... See Part Number Selection Model: L-L Volts Undervoltage Trip ............................ 70-100% of nominal voltage, screwdriver adjustable 250X = 120 VAC, 1 Phase, 50-400 Hz 251X = 120/208 VAC, 3 Phase, 4 Wire, 50-400 Hz Overvoltage Trip ............................... 100-125% of nominal voltage, screwdriver adjustable 252X = 115 VAC, 3 Phase, 3 Wire, 50-400 Hz Pick-Up to Drop-Out Differential ..... 3% maximum 253X* = 230 VAC, 3 Phase, 3 Wire, 50-400 Hz 254X* = 380 VAC, 3 Phase, 3 Wire, 50-400 Hz Contact Ratings ................................ 5 amp resistive at 120 VAC or 28 VDC 255X*= 460 VAC, 3 Phase, 3 Wire, 50-400 Hz Contact Form .................................... One set N.O., one set N.C. 256X* = 575 VAC, 3 Phase, 3 Wire, 50-400 Hz Mounting Operating Temperature Range ........ -20C to +85C Blank = Stud X = Flange Notes: 1. Remove screws for access the overvoltage or undervoltage trip adjustments. Clockwise rotation * Enclosure heigth is 3.835 of the adjustment potentiometer will raise the trip point. Consult factory for additional models. 25 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) 2 13 /64 DIA. 4 MTG. HOLES 2.750 B.C. 3.500