SR — Secondary/Low-Voltage Reset
Sales and Ordering Information
Please contact Customer Service at
SEL Lake Zurich, Illinois at +1.847.362.8304
or by email at CSR@eosmfg.com
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Secondary Reset (SR) Fault Indicators are installed in transformers where secondary voltage is available. SRs are line powered. To operate correctly, the SR's spring clamp must be in contact with a grounded cable shield or semicon, and the low voltage lead must be connected to the secondary.
Upon occurrence of a fault, the display shows a reflective red target which remains until the secondary voltage is restored, and meets the SR's minimum voltage requirement, at which time the SR will automatically reset and the display will show a reflective white target.
The SR's circuitry is epoxy-encapsulated within a UV-stabilized polycarbonate housing. Additionally, the hermetically-sealed display and stainless-steel spring clamp make SRs suitable for harsh underground environments. SRs provide reliable, economical fault location in areas where secondary low voltage is the only source of available energy.
Line-powered arm and reset eliminate the need for a battery.
The secondary voltage supplies the necessary arm and reset requirements in applications where there is insufficient load current to use a SR product.
Available for single- and three-phase applications.
Choose from BEACON® LED, target, and combination displays, depending on your application and operating practices.
Reset restraint option prevents undesired reset from backfeed voltage. Please consult SEL.
| Power Source |
Secondary voltage |
| Secondary Voltage |
110 to 460 Vac |
| Nominal Trip Ratings |
50 to 1000 A |
| Trip Tolerance |
±10% |
| Reset Time* |
Approximately 30 seconds at 120 Vac |
| Maximum Fault |
Current 25 kA for 10 cycles |
| Trip Response Time |
1 ms |
| Outer Diameter Clamping Range |
0.75" to 1.6" (please specify clamping diameter or range when ordering) |
| Housing Material |
UV-stabilized polycarbonate resin |
| Clamp Material |
Stainless steel |
| Temperature Range |
—40° to +85°C |
| * Product may vary depending on configuration |
 Tamperproof Bolt Display
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 BEACON Bolt® Display
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 Standard "V" Display
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 Three-Phase "3" Display
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 Large "L" Display
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 RadioRANGER® Remote Fault Reader Display
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Installation Instructions