256X

Voltage Sensitive Relays WILMAR™ Protective Relays – 250 Series, Over/Undervoltage Function: 27/59 • ANSI/IEEE C37.90-1978 The 250 series relays provide combined Overvoltage 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 . .C. 0B .75 2 00 3.5 / D IA. 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