Current Sensitive Relays
WILMAR™ Protective Relays – WC1 & WCT1 Series, Overcurrent
T ERMINAL STRIPS #6 - 32 SCREWS
Function: 50/51
• ANSI/IEEE C37.90-1978
• UL file No. E58048 • 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 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 phaseband relays are also available.
3.0
23 3 1 /4 /2
31 3 7 /2 /8
See next page for WCT can dimensions
8
Typical Curves (WC1 Series)
6
11 /64" DIA. 4 MTG. HOLES
Note: Dimensions in inches. Multiply values by 25.4 for dimensions in mm.
4
2
Time Delay
0
PART NUMBER SELECTION
0 0.1 0.2 0.3 0.4
Standard Time Delay (WC1 Series) 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.
Pick-Up Time Delay
PRODUCT SPECIFICATIONS
PART NUMBER SELECTION
Sample Part No. WCT1-48DC-5-B Type: WC1 = Per Time Curves WCT1 = Adjustable Time Delay Control Voltage (+/- 15%) 26 DC 48 DC 125 DC 120 AC 230 AC 380 AC 460 AC Trip Adjustment Range 1 = .2 amp - 1 amp 5 = 1 amp to 5 amp 10 = 2 amp to 10 amp Other Options A = Two normally open contacts B = Two normally closed contacts See next pages for 3-phase types and consult factory for additional models.
Part Number
WC1 & WCT1
Line Current ..................................... Single Phase, AC current, 50-400 Hz Direct or from CT Control Voltage ................................ See Part Number Selection Trip Point .......................................... Screwdriver adjustable. Adjustment range in accordance with ordering information. Pick-Up to Drop-Out Differential ..... Approximately 0.1 amp. Overcurrent Allowance .................... Maximum of 500% for 0.25 seconds Surge Withstand Capabiliy .............. In compliance with C37.90B ANSI/IEEE Operating Temperature .................... -40oC to +70oC Temperature Drift ............................. ± .05% Burden .............................................. Current input: 1.2 VA, Control voltage: 2.5 VA Contact Ratings ................................ One set, N.O., One set N.C. 5 amp resistive at 120 VAC or 28 VDC
Notes: 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.
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)
33
Current Sensitive Relays
WILMAR™ Protective Relays – WC3 & WCT3 Series, Overcurrent
TERMINAL STRIPS #6 - 32 SCREWS
Function: 50/51
• ANSI/IEEE C37.90-1978
• UL file No. E58048 • 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 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.
3.0
4.0
1 1/ 64 " D IA. 4 MTG. HOLES Note: Dimensions in inches. Multiply values by 25.4 for dimensions in mm. Time Delay
Part Number
Line Current ..................................... Three Phase, AC current, 50-400 Hz Direct or from CT Control Voltage ................................ See Part Number Selection Trip Point .......................................... Screwdriver adjustable. Adjustment range in accordance with ordering information. Pick-Up to Drop-Out Differential ..... Approximately 0.1 amp Overcurrent Allowance .................... Maximum of 500% for 0.25 seconds Surge Withstand Capabiliy .............. In compliance with the requirements of ANSI/IEEE Operating Temperature .................... -40oC to +70oC Temperature Drift ............................. ± 0.05%/oC Burden .............................................. Current input: 1.2 VA, Control voltage: 2.5 VA Contact Ratings ................................ One set, N.O., One set N.C. 5 amp resistive at 120 VAC or 28VDC
Notes: 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)
4.0 1 /2 4 7 /8 4
3
7 /8
4
21 /
32
See previous page for WC can dimensions
Typical Curves (WC3 Series)
8
6
4
2
PART NUMBER SELECTION
0 0 0.1 0.2 0.3 0.4
Standard Time Delay (WC3 Series) A fixed inverse time delay is incorporated in all 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.
Pick-Up Time Delay
PRODUCT SPECIFICATIONS
PART NUMBER SELECTION
Sample Part No. WCT3-48DC-5A Type: WC3 = Per Time Curves WCT3 = Adjustable Time Delay Control Voltage (+/- 15%) 26 DC 48 DC 125 DC 120 AC 230 AC 380 AC 460 AC Trip Adjustment Range 1 = .2 amp to 1 amp 5 = 1 amp to 5 amp 10 = 2 amp to 10 amp Other Options A = Two normally open contacts B = Two normally closed contacts See previous page for 1-phase models and consult factory for additional models.
WC3 & WCT3
