Schweitzer Engineering Laboratories SEL-351-6 User Manual (English)

Questions and Answers:

S
Sean HernandezAug 9, 2025
What to do if Schweitzer Engineering Laboratories SEL-351-6 Relays don't respond to faults?
- T
  Tanya JacksonAug 9, 2025
  If your Schweitzer Engineering Laboratories Relays don't respond to faults, several factors could be at play. First, verify that the relay settings are correct. Next, check the test source settings. Inspect the CT or PT input wiring for any errors. Ensure the analog input cable between the transformer secondary and the main board is securely connected and not defective. Finally, identify any self-test failures that may have occurred.
S
samuel54Aug 14, 2025
What to do if Schweitzer Engineering Laboratories SEL-351-6 Relays don't respond to commands from device connected to serial port?
- S
  Sherri LeAug 15, 2025
  If the Schweitzer Engineering Laboratories Relays do not respond to commands from a device connected to the serial port, ensure the communications device is properly connected to the relay. Also, verify that the baud rate and communication parameters are correctly configured on both the relay and the communications device. If the relay serial port has received an XOFF, type Q to send an XON and restart communications.
J
jessica61Aug 21, 2025
Why Schweitzer Engineering Laboratories Relays meter command does not respond as expected?
- A
  Andrea LuceroAug 21, 2025
  If the Schweitzer Engineering Laboratories Relays meter command does not respond as expected, first check the global settings, specifically PTCONN, VSCONN, NFREQ, and PHROT, to ensure they are correctly configured. Next, review the group settings CTR, CTRN, PTR, or PTRN. Finally, verify that the relay analog inputs are correctly connected.
B
Brenda EstesAug 27, 2025
What to do if cannot see characters on Relay LCD screen of Schweitzer Engineering Laboratories?
- N
  Nicholas VelazquezAug 27, 2025
  If you cannot see characters on the LCD screen of your Schweitzer Engineering Laboratories Relays, the relay may be deenergized. Check to see if the ALARM contact is closed. If the relay is energized, the LCD contrast may be out of adjustment. Follow the steps in the manual to adjust the contrast.
G
glassjohnSep 1, 2025
Why are all front-panel LEDs dark on my Schweitzer Engineering Laboratories SEL-351-6 Relays?
- K
  Karen RoachSep 1, 2025
  If all the front-panel LEDs on your Schweitzer Engineering Laboratories Relays are dark, it could be due to a couple of reasons. First, check the power supply to ensure input power is present and the fuse is not blown. Alternatively, it could indicate a self-test failure, so identify any self-test failures.

Schweitzer Engineering Laboratories SEL-351-6 Specifications

General

Current Rating	5 A
Frequency	50/60 Hz
Inputs	Analog and Digital
Ethernet Ports	2
Type	Protective Relay
Protocols	DNP3, Modbus
Protection Functions	Overcurrent, Voltage, Frequency, Directional
Operating Temperature	-40°C to +85°C
Mounting	Panel
Communication Ports	RS232, RS485, Ethernet
Digital Inputs	8