U.1.13
Date Code 20090715 User’s Guide SEL-421 Relay
Introduction and Specifications
Specifications
Specifications
U.User’s Guide
General
AC Current Inputs (Secondary Circuits)
Note: Current transformers are Measurement Category II.
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
Nominal Frequency: 50/60 Hz
Range: 30–120 Hz
Burden: <120 VA
48/125 Vdc or 120 Vac
Range: 38–140 Vdc <35W or 85–140 Vac
Nominal Frequency: 50/60 Hz
Range: 30–120 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
Note: EA certified relays do not have MOV protected standard
output contacts.
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 µs, 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.
Auxiliary Trip/Close Pushbuttons (Select Models Only)
Resistive DC or AC Outputs with Arc Suppression Disabled:
Make: 30 A
Carry: 6 A continuous carry
1 s Rating: 50 A
MOV Protection: 250 Vac/330 Vdc/130 J
Courtesy of NationalSwitchgear.com
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