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SEL Technical Support

Pullman, WA, USA

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Latest Firmware Versions

There are no firmware versions available for this product.

Product Revision Firmware ID Date Available Serial Number
SEL-421-2 R131 SEL-421-2-R131-V0-Z100011-D20130627 7/10/13 1131910001
SEL-421-3 R131 SEL-421-3-R131-V0-Z100011-D20130627 7/10/13 1131910001
SEL-421-4 R327-V0 SEL-421-4-R327-V0-Z028014-D20200229 4/11/20 ~1201020001
SEL-421-5 R327-V0 SEL-421-5-R327-V0-Z028014-D20200229 4/11/20 ~1201020001
SEL-421-7 R406-V1 SEL-421-7-R406-V1-Z104002-D20191210 12/14/19 ~1193470001

The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.

Minimum QuickSet Version

Minimum QuickSet Version