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General| Model | SEL-421 |
|---|---|
| Frequency | 50/60 Hz |
| Application | Protection, Automation, and Control |
| Functions | Overcurrent, overvoltage, undervoltage, frequency |
| Inputs | Digital, Analog |
| Outputs | Digital |
| Communications | Ethernet, Serial |
| Mounting | Panel |
| AC Input Voltage | 120/240 Vac |
| Digital Inputs | Configurable |
| Digital Outputs | Multiple, configurable |
| Serial Ports | Multiple, RS-232/RS-485 |
| Ethernet Ports | Multiple, 10/100Base-T |
| Protocols | IEC 61850, DNP3, Modbus |
| Operating Temperature | -40°C to +85°C |
| Category | Protection Relay |
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