1.15
Date Code 20171021 Instruction Manual SEL-421 Relay
Introduction and Specifications
Specifications
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
1 s Rating: 50 A
MOV Protection
(Maximum Voltage): 330Vdc
Pickup/Dropout Time: 6 ms, resistive load
Update Rate: 1/8 cycle
Breaking Capacity (10,000 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.
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: 0 s, resistive load
Dropout Time: 8 ms, resistive load
Update Rate: 1/8 cycle
Breaking Capacity (10,000 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 C37.90-2005.
Note: Per IEC 61810-2:2005.
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
Breaking Capacity (1000 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
High Interrupt DC Outputs With Arc Suppression Enabled
Make: 30 A
Carry: 6 A continuous carry
1 s Rating: 50 A
MOV Protection: 330 Vdc/130 J
Breaking Capacity (10,000 Operations):
48 Vdc 10 A L/R = 40 ms
125 Vdc 10 A L/R = 40 ms
250 Vdc 10 A L/R = 20 ms
Breaker Open/Closed LEDs:
250 Vdc: on for 150–300 Vdc; 192–288 Vac
125 Vdc: on for 80–150 Vdc; 96–144 Vac
48 Vdc: on for 30–60 Vdc;
24 Vdc: on for 15–30 Vdc
Note: With nominal control voltage applied, each LED draws 8 mA (max.).
Jumpers may be set to 125 Vdc for 110 Vdc input and set to 250 Vdc for
220 Vdc input.
Control Inputs
Direct Coupled (For Use With DC Signals)
INT1, INT5, and INT6
Interface Boards: 8 inputs with no shared terminals
Range: 15–265 Vdc, independently adjustable
Accuracy: ±5% ±3 Vdc
Maximum Voltage: 300 Vdc
Sampling Rate: 2 kHz
Typical Burden: 0.24 W @ 125 Vdc
Optoisolated (Use With AC or DC Signals)
Main Board: 5 inputs with no shared terminals
2 inputs with shared terminals
INT2, INT7, and INT8
Interface Boards: 8 inputs with no shared terminals
INT3 and INT4 Interface
Boards:
6 inputs with no shared terminals
18 inputs with shared terminals
(2 groups of 9 inputs with each group
sharing one terminal)
Voltage Options: 24 V standard
48, 110, 125, 220, 250 V level sensitive
DC Thresholds (Dropout Thresholds Indicate Level-Sensitive Option)
24 Vdc: Pickup 19.2–30.0 Vdc
48 Vdc: Pickup 38.4–60.0 Vdc;
Dropout <28.8 Vdc
110 Vdc: Pickup 88.0–132.0 Vdc;
Dropout <66.0 Vdc
125 Vdc: Pickup 105–150 Vdc;
Dropout <75 Vdc
220 Vdc: Pickup 176–264 Vdc;
Dropout <132 Vdc
250 Vdc: Pickup 200–300 Vdc;
Dropout <150 Vdc
AC Thresholds (Ratings Met Only When Recommended Control Input
Settings Are Used—see Table 2.1 on page 2.6)
24 Vac: Pickup 16.4–30.0 Vac rms
48 Vac: Pickup 32.8–60.0 Vac rms;
Dropout <20.3 Vac rms
110 Vac: Pickup 75.1–132.0 Vac rms;
Dropout <46.6 Vac rms
125 Vac: Pickup 89.6–150.0 Vac rms;
Dropout <53.0 Vac rms
220 Vac: Pickup 150.3–264 Vac rms;
Dropout <93.2 Vac rms
250 Vac: Pickup 170.6–300 Vac rms;
Dropout <106 Vac rms
Current Drawn: <5 mA at nominal voltage
<8 mA for 110 V option
Sampling Rate: 2 kHz
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