A-4 Appendix A Date Code 20000421
SEL-251, -2, -3 Instruction Manual
Firmware
Part/Revision No.
Description of Firmware
SEL-251 Firmware, Revision 4 Main Board Configuration
SEL-151-R550 151 50 Hz 1 A
SEL-151-R500 151 60 Hz 1 A
SEL-151-R451 151 50 Hz 5 A
SEL-151-R405 151 60 Hz 5 A
SEL-151-R450 151 50 Hz 5 A
SEL-151-R404 151 60 Hz 5 A
The following table shows firmware that does not precisely match this manual. An explanation
of the differences between firmware versions is in the heading for each group of firmware in the
table.
Firmware
Part/Revision No.
Description of Firmware
SEL-251 Firmware, Revision 4 Main Board Configuration
- added TRIP bit to Relay Word
- expanded DATC setting range
- 1 or 2 stop bit communications protocol options
(previously just 2 stop bits available)
SEL-151-R403 151 60 Hz 5 A
SEL-151-R402 151 60 Hz 5 A
SEL-151-R401 151 60 Hz 5 A
SEL-151-R400 151 60 Hz 5 A
To find the firmware revision number in your relay, obtain an event report (which identifies the
firmware) using the EVENT command. This is an FID number with the Part/Revision number in
bold:
FID=SEL-151-R405-V656rplr-D921102
For a detailed explanation of the Firmware Identification Number (FID) refer to Section 4:
Event Reporting.
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