U.1.11
Date Code 20020501 User’s Guide SEL-421/SEL-421-1 Relay
Introduction and Specifications
Specifications
UUser’s Guide
Specifications
General Specifications
AC Current Inputs (Secondary Circuits)
5 A nominal 15 A continuous,
linear to 100 A symmetrical
500 A for 1 second,
1250 A for 1 cycle
Burden: 0.27 VA @ 5 A
2.51 VA @ 15 A
1 A nominal 3 A continuous,
linear to 20 A symmetrical
100 A for 1 second,
250 A for 1 cycle
Burden: 0.13 VA @ 1 A;
1.31 VA @ 3 A
AC Voltage Inputs
300 V
L-N
continuous (connect any voltage up to 300 Vac)
600 Vac for 10 seconds
Burden: 0.03 VA @ 67 V
0.06 VA @ 120 V
0.8 VA @ 300 V
Power Supply
125/250 Vdc or 120/230 Vac
Range: 85–300 Vdc <35 W or 85–264 Vac
(30 Hz–120 Hz)
Burden: <120 VA
48/125 Vdc or 120 Vac
Range: 38–140 Vdc <35W or 85–140 Vac
(30 Hz–120 Hz)
Burden: <120 VA
24/48 Vdc
Range: 18–60 Vdc
Burden: <35 W
Control Outputs
Standard:
Make: 30 A
Carry: 6 A continuous carry at 70°C
4 A continuous carry at 85°C
1s Rating: 50 A
MOV Protection
(maximum voltage): 250 Vac/330 Vdc
Pickup/Dropout Time: 6 ms, resistive load
Update Rate: 1/8 cycle
Break Capacity (10000 operations):
48 Vdc 0.50 A L/R = 40 ms
125 Vdc 0.30 A L/R = 40 ms
250 Vdc 0.20 A L/R = 40 ms
Cyclic Capacity (2.5 cycle/second):
48 Vdc 0.50 A L/R = 40 ms
125 Vdc 0.30 A L/R = 40 ms
250 Vdc 0.20 A L/R = 40 ms
Hybrid (high current interrupting):
Make: 30 A
Carry: 6 A continuous carry at 70°C
4 A continuous carry at 85°C
1s Rating: 50 A
MOV Protection
(maximum voltage): 330 Vdc
Pickup/Dropout Time: 6 ms, resistive load
Update Rate: 1/8 cycle
Break Capacity (10000 operations):
48 Vdc 10.0 A L/R = 40 ms
125 Vdc 10.0 A L/R = 40 ms
250 Vdc 10.0 A L/R = 20 ms
Cyclic Capacity (4 cycles in 1 second, followed by 2 minutes idle for
thermal dissipation)
48 Vdc 10.0 A L/R = 40 ms
125 Vdc 10.0 A L/R = 40 ms
250 Vdc 10.0 A L/R = 20 ms
Note: Do not use hybrid control outputs to switch ac control signals.
These outputs are polarity dependent.
Fast Hybrid (high-speed high current interrupting):
Make: 30 A
Carry: 6 A continuous carry at 70°C
4 A continuous carry at 85°C
1 s Rating: 50 A
MOV Protection
(maximum voltage): 250 Vac/330 Vdc
Pickup Time: 10 ms, resistive load
Dropout Time: 8 ms, resistive load
Update Rate: 1/8 cycle
Break Capacity (10000 operations):
48 Vdc 10.0 A L/R = 40 ms
125 Vdc 10.0 A L/R = 40 ms
250 Vdc 10.0 A L/R = 20 ms
Cyclic Capacity (4 cycles in 1 second, followed by 2 minutes idle for
thermal dissipation)
48 Vdc 10.0 A L/R = 40 ms
125 Vdc 10.0 A L/R = 40 ms
250 Vdc 10.0 A L/R = 20 ms
Note: Per IEC 60255-23 (1994), using the simplified method of
assessment.
Note: Make rating per IEEE C37.90-1989.
Control Inputs
Range: 15–265 Vdc
Accuracy: ±5% plus ±3 Vdc
Maximum Voltage: 300 Vdc
Sampling Rate: 1/16 cycle
Typical Burden: 0.24 W @ 125 Vdc
Frequency and Rotation
System Frequency: 50/60 Hz
Phase Rotation: ABC or ACB
Frequency tracking range: 40–65 Hz
Communications Ports
EIA-232: 1 Front & 3 Rear
Serial Data Speed: 300–57600 bps
Communications Card Slot for optional
SEL-2701 Ethernet Processor
Time Inputs
IRIG Input
Input: Demodulated IRIG-B time code
Nominal Voltage: 5 Vdc +10%
Maximum Voltage: 8 Vdc
Input Impedance: 333 Ohms
Isolation: 500 Vdc
1k PPS Input
Input: Demodulated IRIG-B and 1k PPS
Nominal Voltage: 5 Vdc +10%
Maximum Voltage: 8 Vdc
Input Impedance: 500 Ohms
Operating Temperature
–40° to +85°C (–40° to +185°F)
Note: LCD contrast impaired for temperatures
below –20° and above +70°C
Humidity
5% to 95% without condensation
Weight (Maximum)
3U Rack Unit: 17.5 lbs (8.0 kg)
4U Rack Unit: 21.5 lbs (9.8 kg)
5U Rack Unit: 25.5 lbs (11.6 kg)
Type Tests
Electromagnetic Compatibility (EMC)
Electromagnetic
Emissions: EN 50263: 1999
Emissions: IEC 60255-25 (2000)
Electromagnetic Compatibility Immunity
Conducted RF Immunity: ENV 50141: 1993,
10 V rms
Digital Radio
Telephone RF: ENV 50204: 1995, 10 V/m at 900 MHz
and 1.89 GHz
Electrostatic Discharge: IEC 60255-22-2 (1996),
Levels 1, 2, 3, 4
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