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SEL-CR

Underground Current Reset Fault Indicator

SEL-CRs can be installed on underground systems. SEL-CRs are powered by the load current present on an energized line. An SEL-CR will respond to a fault and remain in the faulted-display condition until the line is energized with normal line load; at which time, it will automatically reset. 

UV-stabilized housings, stainless steel, and vinyl-coated clamping mechanisms make SEL-CRs suitable for use in the harsh environments of underground applications.

Accessories and Tools for Fault Indicators and Sensors

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Years of Maintenance-Free Operation—Apply this energy-harvesting fault indicator in pad-mounted and underground distribution equipment without elbow test points.

Ideal Fault-Finding Solution—Apply the SEL-CR to primary 200 A-class and 600 A-class URD feeders in any medium-voltage radial distribution circuit. Install the SEL-CR on medium-voltage primary underground cable applications or on low-voltage secondary lines in industrial environments. The SEL-CR automatically resets upon restoration of load current.

Time Savings and Safety—Use remote display options, such as the RadioRANGER Underground Wireless Fault Indication System, to eliminate the need to open a pad-mounted or subsurface enclosure to determine fault status.

Report Back to SCADA—Choose the auxiliary contact option for SCADA compatibility.

  • The SEL-CR automatically resets upon restoration of load current.
  • A closed-core design provides adjacent phase immunity.
  • The SEL-CR works for single- and three-phase applications.
  • BEACON LED, target, and combination display options are available, depending on your application and operating practices.
  • The SEL-CR is ideal for installation in pad-mounted equipment without elbow test points. Install the fault indicator outside of the influence of the ground return path of the cable’s concentric neutral.
  • Installation on low-voltage secondary lines provides an ideal fault-finding solution in industrial environments.
  • The auxiliary contact option provides SCADA compatibility.
  • Fault-powered current reset models are also available for low-load current applications. Please consult SEL.
Power SourceMechanical target: Load current 
LED display: Replaceable battery (standard)—1,200 flashing hours (2.4 Ah, 3.6 V lithium AA cell)
Display OptionsReflective red target
Combination target and BEACON LED
Tamperproof Bolt or BEACON Bolt LED
Inrush Restraint Response Time300 ms
Nominal Trip Rating50 to 1,200 A
Trip Rating Tolerance±10% (specified at +25°C [+77°F]) at the calibrated outside diameter
Trip Response Time1 ms at trip rating (24 ms optional)
Minimum Reset (Operating) Current3 A continuous, 1.5 A optional
Typical Reset Time25 seconds at 10 A and above
Reset TypeStandard: Reset is triggered by current restoration for main phase sensor only.
Optional: Three-phase reset automatically resets when current is restored in each phase of a three-phase set.
Maximum Fault Current25 kA for 10 cycles at 60 Hz
Mounting Diameter RangesStandard: 0.75" to 2.10" (19 mm to 53 mm)
Optional large core: 1.8" to 2.5" (46 mm to 64 mm)
Submersibility15 ft (4.6 m)
HousingUV-stabilized polycarbonate
Transformer CoreVinyl-coated silicon steel
Temperature Range–40° to +85°C (–40° to +185°F)

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