Standard Feature
Model Option
Common features are not listed in this comparison. For more information, visit the product pages.
| Features | SEL-551 SEL-551C | SEL-851 |
|---|---|---|
| Display/Front Panel | ||
| Graphical LCD Display | ||
| Local/Remote Control | ||
| Trip/Close Breaker Control | ||
| 8 Programable LEDs | ||
| USB-C Communications Port | ||
| CT/PT Inputs | ||
| 1 A/5 A Software-Selectable Current Inputs | ||
| 3 Voltage Inputs: VA, VB, VC | ||
| Applications | ||
| Breaker Failure Protection | ƒ | |
| Underfrequency Load Shedding | ||
| Undervoltage Load Shedding | ||
| Loss-of-Potential Logic | ||
| Protection Elements | ||
| 50AF/50NAF Arc-Flash Detection Instantaneous Overcurrent | ||
| 27/59 Over-/Undervoltage | ||
| 32 Directional Power | ||
| 55 Power Factor | ||
| 60 Loss-of-Potential | ||
| 81O/81U Over-/Underfrequency | ||
| Second-Harmonic Blocking | ||
| Instrumentation and Control | ||
| Arc-Flash Detection Inputs | ||
| Load/Signal Profile Recorder | ||
| Software-Invertible Polarities | ||
| Built-In Web Server | ||
| Harmonic Metering | ||
| RMS Metering | ||
| Configuration Software | acSELerator QuickSet SEL-5030 Software | SEL Grid Configurator Software |
| Programmable Digital Inputs (24–250 Vdc/Vac) | ||
| Universal Power Supply (24–250 Vdc/110–240 Vac) | ||
| Communications Ports and Protocols | ||
| USB-C Port (Front) | ||
| Setting-Selectable EIA-232/EIA-485 Port (Rear) | ||
| Single 10/100BASE-T Ethernet Port (Rear) | ||
| Dual 10/100BASE-T Ethernet Ports (Rear) | ||
| Modbus RTU and Modbus TCP/IP | ||
| IEC 61850 Edition 2 | ||
| DNP3 Level 2 (Serial and LAN/WAN) | ||
| Simple Network Time Protocol | ||