html{display:none} FC Fault Counters | Schweitzer Engineering Laboratories


Fault Counters

Fault Counters (FCs) are designed to assist in locating recurrent momentary faults. Momentary faults are produced by tree boughs being blown into power lines, damaged or contaminated insulators, voltage surges, or insulation breakdown that clears upon power interruption of automatic reclosers.

FCs are line-powered from the alternating electric field surrounding the conductor. The FC counts and stores up to ten fault occurrences. The face of the FC is designed in the pattern of an analog clock face and uses a reflective red "hour hand" pointer to indicate the number of faults the FC has recorded. The stored count is erased without removing the FC from the line with a Fault Counter Reset Tool (FCRT).

The FC is easily and quickly installed using a single hot stick. The UV-stabilized housing and stainless steel clamping mechanism make it suitable for use in harsh outdoor environments.

Test and Reset Tools for Fault Indicators

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Count the number of temporary and permanent faults on sections of line with problems caused by defective insulators, tree branches, etc.

Clock-style face with a reflective red pointer counts up to ten faults.

Manually reset with a hot-stick-mounted tool.

Single hot stick installation.

Prevent false tripping during recloser operations with the inrush restraint feature.

Power SourceElectric Field
Nominal Trip Ratings50 to 1200 A
Trip Tolerance±10%
System Voltage Range
5 kV to 20 kV
Maximum Fault Current25 kA for 10 Cycles
Trip Response Time1 ms
Inrush Restraint Response Time300 ms
Outer Diameter Clamping Range0.25" to 1.6" (Please Specify Clamping Diameter or Range When Ordering)
Housing MaterialUV-Stabilized Polycarbonate Resin
Clamp MaterialRubber-Sleeved Stainless Steel
Temperature Range–40° to +85°C
Approximate Weight430 g (0.95 lbs)


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