html{display:none} SEL-2401 Satellite-Synchronized Clock | Schweitzer Engineering Laboratories


Satellite-Synchronized Clock

Compact, precision-time device for limited space and high-accuracy timing to ±100 nanoseconds.

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Precise Time for Recloser Control—Install in harsh environments, including outdoor recloser control enclosures or other locations requiring a small size and tough construction. The SEL-2401 Satellite-Synchronized Clock provides accurate operation from –40° to +80°C (–40° to +176°F) and is compliant with IEEE C37.90 and IEC 60255.

Accurate Time Synchronization—Synchronize field installations by using a GPS time source and a demodulated IRIG-B output. The SEL-2401 provides ±100 ns timing accuracy for IEEE C37.118 control function extensions for synchrophasors as well as event correlation and reporting.

Timing for Small Substations—Install with relays and digital fault recorders inside small substations. Synchronize up to 20 devices from one IRIG-B output. The SEL-2401 is FCC Part 15, Class A emissions-certified for industrial sites.

Accurate Time Synchronization—Provide timing signals to phasor measurement units (PMUs) as part of a synchronized phasor measurement and control (synchrophasor) system.


    1. 1

      Antenna connection (TNC)

    2. 2

      IRIG-B out (BNC)

    3. 3

      Power supply: 9–30 Vdc

    4. 4

      Alarm and control contact

    1. 1

      Serial port (female DB-9)

    2. 2

      Configuration switches



IRIG-B000 Extended Time Code:
IEEE 1344 extensions of year, leap second, daylight-saving time, UTC offset, and parity bit

High Accuracy:
± 100 ns

Substation Hardened:
–40° to +80°C

Fast Troubleshooting:
Align multiple event reports to an exact time

Minimum Software Version

Latest Firmware Versions

There are no firmware versions available for this product.

Product Revision Firmware ID Date Available Serial Number
SEL-2401 R300-V0 SEL-2401-R300-V0-Z003002-D20190725 12/31/19 ~1193650001
SEL-2401 R300-V0 SEL-2401-R300-V0-Z003002-D20190725 4/30/20 ~1201210001
SEL-2401 R200-V0 SEL-2401-R200-V0-Z003002-D20130627 3/13/20 ~1200730001
SEL-2401 R200-V0 SEL-2401-R200-V0-Z003002-D20130627 8/5/13 ~1132170001
SEL-2401 R112-V1 SEL-2401-R112-V1-Z003002-D20190604 6/8/19 < ~1132170001

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

Minimum Software Version