1 3 /2 3 2 /4 Current Sensitive Relays Function: 50/51 WILMAR Protective Relays WC1 & WCT1 Series, Overcurrent ANSI/IEEE C37.90-1978 TERMINAL STRIPS UL file No. E58048 6 - 32 SCREWS CSA file No. LR61158 Current sensitive relays are available for single and three phase applications. Voltage controlled overcurrent relays protect generators against fault currents below the full rated value, when the fault produces a voltage drop as in the case of short circuits or grounds. Phase balance relays are avail- 3.0 able to sense and control unbalanced current flow in three phase systems. Current differential relays operate when the differential between two currents exceeds preset values. Over/under current phase- band relays are also available. See next page for WCT can dimensions Typical Curves (WC1 Series) 8 6 11 /64 DIA. 4 MTG. HOLES 4 Note: Dimensions in inches. Multiply values by 25.4 for dimensions in mm. 2 PART NUMBER SELECTION Time Delay 0 0 0.1 0.2 0.3 0.4 Standard Time Delay (WC1 Series) Pick-Up Time Delay A fixed inverse time delay is incorporated in all overcurrent relays and is represented by the typical curves shown. Adjustable Time Delay (WCT1 Series) The time delay is field adjustable. The standard time delay can be increased by any value between 0.5 and 20 seconds. PRODUCT SPECIFICATIONS PART NUMBER SELECTION Part Number WC1 & WCT1 Sample Part No. WCT1-48DC-5-B Line Current ..................................... Type: Single Phase, AC current, 50-400 Hz Direct or from CT WC1 = Per Time Curves Control Voltage ................................ See Part Number Selection WCT1 = Adjustable Time Delay Control Voltage (+/- 15%) Trip Point .......................................... Screwdriver adjustable. Adjustment range in 26 DC accordance with ordering information. 48 DC 125 DC Pick-Up to Drop-Out Differential ..... Approximately 0.1 amp. 120 AC 230 AC Overcurrent Allowance .................... Maximum of 500% for 0.25 seconds 380 AC 460 AC Surge Withstand Capabiliy .............. In compliance with C37.90B ANSI/IEEE Trip Adjustment Range o o 1 = .2 amp - 1 amp Operating Temperature .................... -40 C to +70 C 5 = 1 amp to 5 amp Temperature Drift ............................05% 10 = 2 amp to 10 amp Other Options Burden .............................................. Current input: 1.2 VA, Control voltage: 2.5 VA A = Two normally open contacts B = Two normally closed contacts Contact Ratings ................................ One set, N.O., One set N.C. 5 amp resistive at 120 VAC or 28 VDC See next pages for 3-phase types and consult factory for Notes: additional models. 1. Remove black screws for access to the current pick-up and the time delay adjustment. 2. Clockwise rotation of the pick-up adjustment will raise the current trip point. 3. Clockwise rotation of the time delay adjustment, (Type WCT1 only) will increase the time delay. 33 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) 1 3 /2 7 3 /81 4 /2 4.0 4.0 7 4 /8 11 /64 DIA. 4 MTG. HOLES Current Sensitive Relays WILMAR Protective Relays WC3 & WCT3 Series, Overcurrent Function: 50/51 ANSI/IEEE C37.90-1978 TERMINAL STRIPS UL file No. E58048 6 - 32 SCREWS CSA file No. LR61158 Current sensitive relays are available for single and three phase applications. Voltage controlled overcurrent relays protect generators against fault currents below the full rated value, when the fault produces a voltage drop as in the case of short 3.0 circuits or grounds. Phase balance relays are available to sense and control unbalanced current flow in three phase systems. Current differential relays operate when the differential between two currents exceeds preset values. Over/under current phase-band relays are also available. Typical Curves (WC3 Series) See previous page for WC can 8 dimensions 6 4 Note: Dimensions in inches. Multiply values by 25.4 for dimensions in mm. 2 Time Delay PART NUMBER SELECTION 0 Standard Time Delay (WC3 Series) 0 0.1 0.2 0.3 0.4 A fixed inverse time delay is incorporated in all Pick-Up Time Delay overcurrent relays and is represented by the typical curves shown. Adjustable Time Delay (WCT3 Series) The time delay is field adjustable. The standard time delay can be increased by any value between 0.5 and 20 seconds. PRODUCT SPECIFICATIONS PART NUMBER SELECTION Part Number WC3 & WCT3 Sample Part No. WCT3-48DC-5A Type: Line Current ..................................... Three Phase, AC current, 50-400 Hz Direct or from CT WC3 = Per Time Curves Control Voltage ................................ See Part Number Selection WCT3 = Adjustable Time Delay Control Voltage (+/- 15%) Trip Point .......................................... Screwdriver adjustable. Adjustment range in 26 DC accordance with ordering information. 48 DC 125 DC Pick-Up to Drop-Out Differential ..... Approximately 0.1 amp 120 AC 230 AC Overcurrent Allowance .................... Maximum of 500% for 0.25 seconds 380 AC 460 AC Surge Withstand Capabiliy .............. In compliance with the requirements of ANSI/IEEE Trip Adjustment Range o o 1 = .2 amp to 1 amp Operating Temperature .................... -40 C to +70 C 5 = 1 amp to 5 amp o Temperature Drift ............................. 0.05%/ C 10 = 2 amp to 10 amp Other Options Burden .............................................. Current input: 1.2 VA, Control voltage: 2.5 VA A = Two normally open contacts B = Two normally closed contacts Contact Ratings ................................ One set, N.O., One set N.C. 5 amp resistive at 120 VAC or 28VDC See previous page for 1-phase models and consult factory Notes: for additional models. 1. Remove black screws for access to the current pick-up and the time delay adjustment. 2. Clockwise rotation of the pick-up adjustment will raise the current trip point. 3. Clockwise rotation of the time delay adjustment, (Type WCT3 only) will increase the time delay. 34 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) 7 3 /8 21 4 /32