CRD — Current Reset
Sales and Ordering Information
Please contact Customer Service at
SEL Lake Zurich, Illinois at +1.847.362.8304
or by email at csrlz@selinc.com
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CRD-Current Reset Fault Indicators are used for fault location on overhead power distribution systems. CRDs are powered by the load current present around the conductor. They indicate a faulted-line condition by showing a large, red reflective target (8-square-centimeters). CRDs automatically reset to a normal line condition by showing a white, reflective target upon restoration of load current that meets the CRDs minimum load requirement.
CRDs can be installed with a single hot stick, have a 1 ms response time, and significantly reduce fault-finding time. The UV-stabilized, polycarbonate housing, vinyl-coated core, and stainless-steel spring make CRDs suitable for application in harsh, outdoor conditions.
- Load current-powered—no battery necessary.
- No minimum-voltage requirement.
- Automatically resets upon restoration of load current.
- Inrush restraint feature prevents false tripping during recloser operations.
- Maintains trip tolerance throughout the clamping range.
- Easy to install with a single hot stick.
- UV-stabilized materials provide excellent weatherability.
| Power Source |
Load current |
| Nominal Trip Ratings |
100 to 1200 A |
| Trip Tolerance |
±10% |
| System Voltage Range (L-L) |
Up to 38 kV |
| Reset Time |
25 seconds at 3 A |
| Reset Current |
3 A |
| Maximum Fault Current |
25 kA for 10 cycles |
| Trip Response Time |
1 ms |
| Inrush Restraint Response Time |
300 ms |
| Outer Diameter Clamping Range |
0.3" to 1.1" (please specify clamping diameter or range when ordering) |
| Housing Material |
UV-stabilized polycarbonate resin |
| Transformer Core |
Silicon steel with vinyl coating |
| Temperature Range |
—40° to +85°C |
| Approximate Weight |
510 g (1.12 lbs) |